SuperStack II Desktop Switch User Guide - nag.ru// SuperStack® II Desktop Switch User Guide ... The...

erStack® II Desktop Switchr Guide

oftware Version 3.1

®

http://www.3com.com

Document No. DUA1690Published June 1997

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3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145

t © 3Com Ireland, 1997. All rights reserved. No part of this ntation may be reproduced in any form or by any means or used to y derivative work (such as translation, transformation, or on) without permission from 3Com Ireland.

eland reserves the right to revise this documentation and to make in content from time to time without obligation on the part of eland to provide notification of such revision or change.

eland provides this documentation without warranty of any kind, plied or expressed, including, but not limited to, the implied es of merchantability and fitness for a particular purpose. 3Com ke improvements or changes in the product(s) and/or the (s) described in this documentation at any time.

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icted Rights in Technical Data and Computer Software Clause at . 52.227-7013. 3Com Ireland, c/o 3Com Limited, 3Com Centre, y Way, Hemel Hempstead, Herts, HP2 7YU, United Kingdom.

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Other brand and product names may be registered ttrademarks of their respective holders.

Environmental Statement

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This paper is fully biodegradable and recyclable.

CONTENT

ABOUT THIS

Introduction 1

How to Use Th

Conventions 2

Related Docum

1 GETTING STA

About the Supe

Summary o

Port Conne

10BASE

100BASE-TX Port 1-2

Plug-in

Transce

Backbo

Switch Ope

How Do

Forward

Intellige

Full Dup

Security

Resilien

Virtual L

Spannin

PACE 1

Network Config

1-11

Ethernet Address 1-11

Unit Defaults 1-12

itch 1-13

t 2-2

2-2

nits 2-4

Module 1-2

iver Module 1-2

ne Port 1-2

ration and Features 1-3

es the Switch Compare to a Bridge? 1-3

ing of Packets 1-3

nt Flow Management 1-4

lex 1-4

1-5

t Links 1-5

ANs 1-5

g Tree Protocol 1-6

-6

uration Example 1-7

Managing the Desktop Switch 1-12

Quick Start For SNMP Users 1-13

Entering an IP Address for the Sw

2 INSTALLATION AND SETUP

Following Safety Information 2-1

Positioning the Desktop Switch 2-1

Configuration Rules for Fast Etherne

Configuration Rules with Full Duplex

Installing the Desktop Switch 2-4

Rack Mounting 2-4

Stacking the Switch and Other U

Wall Mounting 2-5

S

GUIDE

is Guide 1

entation 2

RTED

rStack II Desktop Switch 1-1

f Features 1-1

ctions 1-2

-T Ports 1-2

Unit Overview — Front 1-8

10BASE-T Ports 1-9

100BASE-TX Port 1-9

LEDs 1-9

Unit Overview — Rear 1-10

Power Socket 1-11

Unit Serial Number 1-11

Redundant Power System Socket

Reset Button 1-11

Console Port 1-11

Plug-in Module Slot 1-11

Transceiver Module Slot 1-11

P

C

C

3 SM

M

N

S

Logging On 3-7

4 MS

C

D

E

A

C

6

4-18

2

Upgrading Software 4-29

ovement 5-2

ffic 5-2

5-2

rts From the Default

3

After Logging On 3-8

Switch Management Setup 3-9

Logging Off 3-12

Auto Logout 3-12

ANAGING THE DESKTOP SWITCH

etting Up Users 4-2

reating a New User 4-3

eleting a User 4-4

diting User Details 4-5

ssigning Local Security 4-6

hoosing a Switch Management Level 4-7

5 ADVANCED MANAGEMENT

Virtual LANs (VLANs) 5-1

What are VLANs? 5-1

Benefits of VLANs 5-1

How VLANS Ease Change and M

How VLANs Control Broadcast Tra

How VLANs Provide Extra Security

An Example 5-2

VLANs and the Switch 5-3

The Default VLAN and Moving PoVLAN 5-3

Connecting VLANs to a Router 5-

owering-Up the Switch 2-6

onnecting a Redundant Power System (RPS) 2-6

onnecting Equipment to the Console Port 2-7

Connecting a VT100 Terminal 2-7

Connecting a VT100 Terminal Emulator 2-7

Connecting a Workstation Running SLIP 2-8

ETTING UP FOR MANAGEMENT

ethods of Managing the Desktop Switch 3-1

Using the VT100 Management Interface 3-1

Using Telnet 3-2

anaging Over The Network 3-2

IP Addresses 3-2

Obtaining a Registered IP Address 3-3

avigating the VT100 Screens 3-4

Screen Conventions 3-4

Keyboard Shortcuts 3-5

Correcting Text Entry 3-5

etting Up the Switch for Management 3-6

Setting Up the Switch Unit 4-9

Setting Up the Switch Ports 4-12

Setting Up the Switch Database (SDB) 4-1

The Database View 4-17

Searching the Switch Database 4-18

By MAC Address 4-18

By Port 4-18

Adding an Entry into the SDB 4-18

Deleting an Entry from the SDB 4-18

Specifying that an Entry is Permanent

Setting Up Resilient Links 4-19

Configuring Resilient Links 4-20

Creating a Resilient Link Pair 4-21

Deleting a Resilient Link Pair 4-21

Viewing the Resilient Links Setup 4-2

Setting Up Traps 4-24

Setting Up the Console Port 4-25

Resetting the Desktop Switch 4-27

Initializing the Desktop Switch 4-28

What is STP? 5-12

25

8

TISTICS

Port Traffic Statistics 6-4

stem (RPS) A-3

A-4

le A-5

A-5

How STP Works 5-14

STP Initialization 5-14

STP Stabilization 5-14

STP Reconfiguration 5-14

An Example 5-15

STP Configurations 5-16

Enabling STP on the Switch 5-17

Configuring STP on the Switch 5-18

Configuring the STP Parameters of VLANs 5-18

Configuring the STP Parameters of Ports 5-20

RMON 5-22

What is RMON? 5-22

About the RMON Groups 5-22

Statistics 5-22

Port Error Analysis 6-6

Status Monitoring 6-8

Fault Log 6-9

Remote Polling 6-10

A SAFETY INFORMATION

Important Safety Information A-1

Power Supply and Fuse A-3

Sockets for Redundant Power Sy

RJ45 Ports A-3

L’information de Sécurité Importante

La Source de Courant et Le Fusib

Socle Pour Alimentation Multiple

Connecting Common VLANs Between Switch Units 5-3

Using AutoSelect VLAN Mode 5-4

Using Non-routable Protocols 5-5

Using Unique MAC Addresses 5-5

Extending VLANs into an ATM Network 5-5

VLAN Configurations 5-5

Example 1 5-5

Example 2 5-6

Example 3 5-7

Setting Up VLANs on the Switch 5-8

Assigning a Port to a VLAN When Using Port VLAN Mode 5-10

Specifying a Backbone Port 5-10

Specifying that a Port is a VLT Port 5-10

Setting Up VLANs Using AutoSelect VLAN Mode 5-11

Specifying Information About the VLAN Server 5-11

Specifying AutoSelect VLAN Mode 5-11

Spanning Tree Protocol 5-12

History 5-22

Alarms 5-23

Hosts 5-23

Hosts Top N 5-23

Matrix 5-23

Filter 5-23

Capture 5-23

Events 5-24

Benefits of RMON 5-24

RMON and the Switch 5-25

RMON Features of the Switch 5-

About Alarm Actions 5-27

About Default Alarm Settings 5-2

About the Audit Log 5-28

6 STATUS MONITORING AND STA

Summary Statistics 6-2

Port Statistics 6-3

W

B S

C TL

U

U

D PN

P

M

R

E D

F TO

S

RRANTY

Y STATEMENTS

ESKTOP SWITCH TECHNICAL SPECIFICATIONS

ECHNICAL SUPPORT

nline Technical Services F-1

World Wide Web Site F-1

3Com Bulletin Board Service F-1

Access by Analog Modem F-1

Access by Digital Modem F-2

3ComFacts Automated Fax Service F-2

3ComForum on CompuServe® Online Service F-2

upport from Your Network Supplier F-3

Les Ports RJ45 A-5

ichtige Sicherheitsinformationen A-6

Stromversorgung und Sicherung A-7

Steckdose für Redundant Power System (RPS) A-7

RJ45 Anschlußen A-7

CREEN ACCESS RIGHTS

ROUBLE-SHOOTING

EDs C-1

sing the VT100 Interface C-2

sing the Switch C-3

IN-OUTS

ull Modem Cable D-1

C-AT Serial Cable D-1

odem Cable D-2

J45 Pin Assignments D-2

Support from 3Com F-3

Returning Products for Repair F-4

GLOSSARY

3COM CORPORATION LIMITED WA

ELECTRO-MAGNETIC COMPATIBILIT

T

is scrlolic

p c1

isotwno

rm p, f

utre

specific information

Turn to...

Chapter 1

itch into Chapter 2

to man- Chapter 3

witch Chapter 4

ent fea-d RMON

Chapter 5

the Desk- Chapter 6

Appendix A

VT100 Appendix B

Appendix C

e Desktop Appendix D

ns of the Appendix E

ilable Appendix F

ABOUT

About Thguide, dewhere to other pub

IntroductionThis guideinstall andSwitch (3C

The guidetrators whting up neworking k

If the infowith yourthis guide

ThroughoSwitch is Switch.

HIS GUIDE

Guide provides an overview of this ibes the guide conventions, tells you ok for specific information, and lists ations that may be useful.

rovides the information you need to onfigure the SuperStack® II Desktop 6902) with version 3.1 agent software.

intended for use by network adminis- are responsible for installing and set-

ork equipment. It assumes a basic wledge of Local Area Networks.

ation in the Release Notes shipped roduct differs from the information in ollow the Release Notes.

this guide, the SuperStack II Desktop ferred to as the Desktop Switch or

How to Use This GuideThis table shows where to findin this guide.

If you are looking for...

An overview of the Desktop Switch

Information about installing the Desktop Swyour network

Information about the methods you can useage the Desktop Switch

Information about managing the Desktop S

Information about more advanced managemtures; for example VLANs, Spanning Tree, an

Information about monitoring the status of top Switch

Safety information

Information about the access rights for eachscreen

Trouble-shooting information

Information about the pin-outs relating to thSwitch

Information about the Technical SpecificatioDesktop Switch

Information about the Technical Support avafrom 3Com

2 ABOUT THIS GUIDE

ConvenTth

includes:

uick Reference

AAA0x

uick Installation

AA0x

lease Notes. AAA0x

seful:

he

he Redundant

Table 1

Convent

Screendisplays

The word“enter” and “type

[Key] nam

Menu comand butto

Words in type

Words in bold-face

instructions

, system damage,

al injury

tionsable 1 and Table 2 list conventions that are used roughout this guide.

Related DocumentationThe Desktop Switch document set

■ SuperStack II Desktop Switch QGuide. Document Number DQA1690-2

■ SuperStack II Desktop Switch QGuide. Document Number DIA1690-2A

■ SuperStack II Desktop Switch ReDocument Number DNA1690-2

Other publications you may find u

■ Documentation accompanying tPlug-in Modules.

■ Documentation accompanying tPower System.

Text Conventions

ion Description

This typeface represents information as it appears on the screen.

s

”

When you see the word “enter” in this guide, you must type something, and then press the Return or Enter key. Do not press the Return or Enter key when an instruction simply says “type.”

es Key names appear in text in one of two ways:

■ Referred to by their labels, such as “the Return key” or “the Escape key”

■ Written with brackets, such as [Return] or [Esc].

If you must press two or more keys simulta-neously, the key names are linked with a plus sign (+). Example:

Press [Ctrl]+[Alt]+[Del].

mands ns

Menu commands or button names appear in italics. Example:

From the Help menu, select Contents.

italicized Italics emphasize a point or denote new terms at the place where they are defined in the text.

typeBold text denotes key features.

Table 2 Notice Icons

Icon Notice Type Alerts you to...

Information note

Important features or

Caution Risk of personal injuryor loss of data

Warning Risk of severe person

p

oopf ucre

es bg reity

at

op

tch

he

M(A

iv

t frt,

rw

nt for congestion con-

rnet and Fast Ethernet g-in Module ports

(VLANs)

) per VLAN

ol Enabled) for sup-ions over Ethernet

ecture:

Power System

agement

ne mounting

over SNMP

address configuration

1

About the Su

Part of 3Cthe Deskt10Mbps oinstall andfor the in

Use the Ddedicateddemandinand otherhigh qual

Summary of Fe

The Deskt

■ 24 swi

■ Fast Et

■ Plug-inMode

■ Transce

■ Supporper po

■ Four fo

GETTING STARTED

erStack II Desktop Switch

m’s SuperStack® II range of products, Switch is designed to dedicate a full bandwidth to each user. It is simple to se, and it ensures sufficient performance asing load on today’s networks.

ktop Switch to provide your users with andwidth and support for bandwidth applications, such as video-conferencing al-time applications that require a very

of service.

ures

Switch has the following features:

ed Ethernet 10BASE-T ports

rnet 100BASE-TX port

odule slot (Asynchronous Transfer TM) and Fast Ethernet)

er Module slot (10Mbps Ethernet)

or desktop switching — one endstation unlimited stations on backbone port

arding modes for packets

■ Intelligent Flow Managemetrol

■ Full duplex on all fixed Etheports, and Fast Ethernet Plu

■ Security

■ Resilient Links

■ Support for 16 Virtual LANs

■ Spanning Tree Protocol (STP

■ PACE (Priority Access Contrporting multimedia applicat

■ 3Com’s SuperStack II archit

■ Connects to Redundant

■ Integrated network man

■ 19-inch rack or stand-alo

■ SmartAgent support:

■ IP and IPX management

■ RMON

■ Repeater and Bridge MIB

■ Broadcast storm control

■ Easy software upgrades

■ BOOTP for automatic IP

■ Local management

1-2 CHAPTER 1: GETTING STARTED

Port Co

1

TMbmtw

Ayd1

1

Tpaso

Anw1

P

AMTEb

s you to install t Transceiver Mod-s fitted, port 1 the Transceiver ule can provide a twork.

ny port to be a attributes:

are not stored in ase which con-ed by the Switch)

s received by the rt

o connect the etworks. For infor-ckbone port for a “Setting Up the

t for each VLAN formation about

r a VLAN, refer to on page 5-8.

nnections

0BASE-T Ports

he Switch has 24 10BASE-T ports configured as DIX (cross-over), which provide a full 10Mbps

andwidth to attached endstations. Maximum seg-ent length is 100m (328ft) over grade 3, 4, or 5 isted pair cable.

s these ports are configured as MDIX (cross-over), ou need to use a cross-over cable to connect to evices whose ports are MDIX-only. Most of the 0BASE-T ports in 3Com devices are MDIX-only.

00BASE-TX Port

he Switch has a single Fast Ethernet 100BASE-TX ort configured as MDIX (cross-over), which provides 100Mbps connection to, for example, a local erver. Maximum segment length is 100m (328ft) ver grade 5 twisted pair cable.

s this port is configured as MDIX (cross-over), you eed to use a cross-over cable to connect to devices hose ports are MDIX-only. Most of the 00BASE-TX ports in 3Com devices are MDIX-only.

lug-in Module

slot at the rear of the unit can take a Plug-in odule, providing an additional high-speed port.

his could be used, for example, to provide a Fast thernet or Asynchronous Transfer Mode (ATM) ackbone connection to the rest of your network.

Transceiver Module

A slot at the rear of the unit allowany of the 3Com 10Mbps Etherneules. When a Transceiver Module iautomatically switches to become Module port. The Transceiver Mod10Mbps link to the rest of your ne

Backbone Port

The Switch allows you to specify abackbone port with the following

■ Addresses received on the port the Switch Database (the databtains the device addresses receiv

■ Frames with unknown addresseSwitch are forwarded to the po

A backbone port is typically used tSwitch to the backbone of large nmation about how to specify a banew or initialized Switch, refer to Switch Unit” on page 4-9.

You can specify one backbone pordefined on the Switch. For more inhow to specify a backbone port fo"Setting Up VLANs on the Switch"

esktop Switch 1-3

Swi

packet is processed Switch.

Add

Forw

Opepack

Span

ActiUnkDestAdd

Data

ss Action

Forward to back-bone port only

e Filter

Forward to specific port only

Forward to all ports (including back-bone) in the same VLAN as source port

Filter

ack- Forward to known port only

Forward to all ports within specific VLAN

About the SuperStack II D

tch Operation and Features

How Does the Switch Compare to a Bridge?

The table below shows how Desktop Switch opera-tion compares to that of a conventional IEEE 802.1d bridge.

In all other ways, Desktop Switch and bridge opera-tion is identical.

Forwarding of Packets

The table below shows how awhen it arrives at the Desktop

IEEE 802.1d Bridge Desktop Switch

ress Learning All ports All ports except back-bone port

arding Mode Store and forward Fast Forward, Frag-ment Free, Store and Forward, or Intelligent

ration when et buffers full

Discard packets Invoke Intelligent Flow Management to suppress transmis-sions at source

ning Tree Supported Optional

on on nown ination ress

Flood all ports Forward to backbone port

base size 4000 addresses Four addresses per port

Packet Source Destination Addre

Any port EXCEPT backbone (Unicast packet)

Unknown

Same port as sourcaddress

Another port (not backbone)

Any port EXCEPT backbone (Multi/Broadcast packet)

Not applicable

Backbone port(Unicast packet)

Unknown

Known port (not bbone)

Backbone port(Multi/Broadcast packet)

Not applicable


TDfr

■

■

■

■

ing forwarding itch Unit” on

) is a system for work. Conges-e devices sending t on the Desktop itch is connected

M prevents from generating ongestion ends.

f it is connected n. IFM should be repeater.

ing IFM on a ch Ports” on

uplex support for rnet ports, and . Full duplex d received simul-

he potential ull duplex also f up to 2km.

he relevant ports, dividual ports. Full nsceiver Module.

o best suit your networking requirements, the esktop Switch allows you to select one of four ame forwarding modes:

Fast Forward — Frames are forwarded as soon as the destination address is received and verified. The forwarding delay, or latency, for all frames in this mode is just 40µs, but with the lack of checking time any error frames received are prop-agated through the Switch.

Fragment Free — A minimum of 64 bytes of the received frame is buffered prior to the frame being forwarded. This ensures that collision frag-ments are not propagated through the network. The forwarding delay, or latency, for all frames in this mode is 64µs.

Store and Forward — Received packets are buff-ered in their entirety prior to forwarding. This ensures that only good frames are passed to their destination. The forwarding delay for this mode varies between 64µs and 1.2ms, depending on frame length. In Store and Forward mode, latency is measured as the time between receiving the last bit of the frame and transmitting the first bit. For the Desktop Switch, this is 8µs.

Intelligent — The Switch monitors the amount of error traffic on the network and changes the forwarding mode accordingly. If the Switch detects less than 18 errors a second, it operates in Fast Forward mode. If the Switch detects 18 or more errors a second, it operates in Store and Forward mode until the number of errors a second returns to zero.

For more information about selectmodes, refer to “Setting Up the Swpage 4-9.

Intelligent Flow Management

Intelligent Flow Management (IFMcontrolling congestion on your nettion can be caused by one or mortraffic to an already congested porSwitch. If a port on the Desktop Swto another switch or endstation, IFpacket loss and inhibits the devicemore packets until the period of c

IFM should be enabled on a port ito another switch, or an endstatiodisabled on a port connected to a

For more information about enablport, refer to “Setting Up the Switpage 4-12.

Full Duplex

The Desktop Switch provides full dall its fixed Ethernet and Fast EtheFast Ethernet Plug-in Module portsallows frames to be transmitted antaneously and, in effect, doubles tthroughput of a link. In addition, fsupports 100BASE-FX cable runs o

Full duplex can be enabled on all tall the Fast Ethernet ports, or on induplex is not supported by the Tra

esktop Switch 1-5

ual LAN (VLAN) fea- your network seg- by physical d as a group of loca-t devices that com-

same physical LAN. network has three

vement of devices on n in VLAN 1 is moved the network, you e new port is in

t traffic. If an endsta-broadcast frame, eceive the frame.

vices in VLAN 1 can ices in VLAN 2 using

LANs, refer to “Virtual

About the SuperStack II D

For more information about enabling full duplex, refer to “Setting Up the Switch Unit” and “Setting Up the Switch Ports” in Chapter 4.

Security

The Desktop Switch contains advanced security fea-tures which guard against users connecting unau-thorized endstations to your network. When security is enabled on a port, it enters single address learn-ing mode. In this mode, the port learns a single Ethernet address; once this is learned, the port is disabled if a different address is seen on the port. Until security is disabled, no other address can be learned.

For more information about enabling security on a port, refer to “Setting Up the Switch Ports” on page 4-12.

Resilient Links

The Resilient Link feature in the Desktop Switch enables you to protect critical links and prevent net-work downtime should those links fail.

Setting up resilience ensures that should a main communication link fail, a standby duplicate link immediately and automatically takes over the task of the main link. Each main and standby link pair is referred to as a resilient link pair.

For more information about resilient links, refer to “Setting Up Traps” on page 4-24.

Virtual LANs

The Desktop Switch has a Virtture which allows you to buildments without being restrictedconnections. A VLAN is definetion- and topology-independenmunicate as if they are on theImplementing VLANs on your main advantages:

■ It eases the change and moIP networks. If an endstatioto a port in another part ofonly need to specify that thVLAN 1.

■ It helps to control broadcastion in VLAN 1 transmits a then only VLAN 1 devices r

■ It provides extra security. Deonly communicate with deva router.

For more information about VLANs (VLANs)” on page 5-1.


S

Ttovtoe

■

■

FT

P

TCdF

■

-way multimedia etwork, interfer-

to the bandwidth in one direction. llocates the avail- directions, there-e traffic.

up PACE on the itch Unit" and

hapter 4.

panning Tree Protocol

he Desktop Switch supports the Spanning Tree Pro-col (STP) which is a bridge-based system for pro-

iding fault tolerance on networks. STP allows you implement parallel paths for network traffic, and

nsure that:

Redundant paths are disabled when the main paths are operational

Redundant paths are enabled if the main traffic paths fail

or more information about STP, refer to “Spanning ree Protocol” on page 5-12.

ACE

he Desktop Switch supports PACE (Priority Access ontrol Enabled) technology, which allows multime-ia traffic to be carried over standard Ethernet and ast Ethernet LANs. PACE provides two features:

Implicit Class of Service — When multimedia traf-fic is transmitted, it is given a higher priority than other data and is therefore forwarded ahead of other data when it arrives at the Switch. The Implicit Class of Service feature minimizes latency through the Switch and protects the quality of multimedia traffic.

■ Interactive Access — When twotraffic passes over an Ethernet nence can occur because access is unequally allocated to traffic The Interactive Access feature aable bandwidth equally in bothfore increasing the quality of th

For more information about settingSwitch, refer to "Setting Up the Sw"Setting Up the Switch Ports" in C

ation Example 1-7

Network

.

Figuyoufor ratewithis c

an be used in a in Chapter 5.

Figure

Network Configur

Configuration Example

1-1 Example network configuration for desktop switching

re 1-1 shows how the Switch can be placed on r network. In this example, the Switch is used a group of heavy-traffic users in a large corpo- network. Switching is brought to the desktop a single endstation per port, and a local server

onnected using the 100Mbps Fast Ethernet port.

Examples of how the Switch cVLAN-based network are given


Unit Overvi

F
igure 1-2
ew — Front

Desktop Switch front view

rview — Front 1-9

10B

100B

LED

ceiver Module fitted to the

transmitted/received on

ort is enabled.

ort is disabled.

nt.

transmitted/received on ule port.

ort is enabled.

ort is disabled.

perStack II Switch ATM ser Guide”.

has failed its Power On Self T LED is flashing yellow), or

are of the Plug-in Module is rectly.

is not recognized.

nt or Plug-in Module is not witch.

d-up.

ing normally.

Module is either down-izing (which includes a est).

its Power On Self Test.

has failed its Power On Self

Unit Ove

ASE-T Ports

The Switch has 24 10BASE-T RJ45 ports configured as MDIX (cross-over), which provide a full 10Mbps bandwidth to attached endstations. The maximum segment length is 100m (328ft) over category 3, 4, or 5 UTP cable.

As these ports are configured as MDIX (cross-over), you need to use a cross-over cable to connect to devices whose ports are MDIX-only. Most of the 10BASE-T ports in 3Com devices are MDIX-only.

ASE-TX Port

The Switch has a single Fast Ethernet 100BASE-TX RJ45 port configured as MDIX (cross-over), which provides a 100Mbps connection to, for example, a local server. The maximum segment length is 100m (328ft) over category 5 UTP or STP cable.

As this port is configured as MDIX (cross-over), you need to use a cross-over cable to connect to devices whose ports are MDIX-only. Most of the 100BASE-TX ports in 3Com devices are MDIX-only.

s

The table below describes the LED behavior on the Switch. For more details about corrective action in the event of a problem, refer to "LEDs" on page C-1.

LED Color Indicates

TCVR Yellow Port 1 is a Transrear of the unit.

Port Status LEDs (ports 1–24 and 26)

Packet Yellow Frames are beingthe port.

Status Green Link is present; p

Green flashing Link is present; p

Off Link is not prese

Plug-in Module Status LEDs (port 25)

Packet Yellow Frames are beingthe Plug-in Mod

Status Green Link is present; p

Green flashing Link is present; p

Green flashing(long on, short off)

Refer to the “SuOC-3c Module U

Yellow Plug-in Module Test (if the MGMthe agent softwnot installed cor

Yellow flashing Plug-in Module

Off Link is not preseinstalled in the S

Unit Status LEDs

Power Green Switch is powere

MGMT Green Switch is operat

Green flashing Switch or Plug-inloading or initialPower On Self T

Yellow Switch has failed

Yellow flashing Plug-in Module Test.


Unit Overvi

F
igure 1-3
ew — Rear

Desktop Switch rear view

rview — Rear 1-11

Pow

Unit

Red

Rese

Con

Module. The Module speed link to the rest es a range of Plug-in r for availability.

installed, ensure the ace.

sceiver Module and rest of the network. d from the front ver Module port

om provides a range t your supplier for

not installed, ensure n place.

hernet (or MAC)

Unit Ove

er Socket

The Desktop Switch automatically adjusts to the supply voltage. The fuse is suitable for both 110V A.C. and 220–240V A.C. operation. For informa-tion on replacing fuses, refer to Appendix A.

Serial Number

You may need this serial number for fault reporting purposes.

undant Power System Socket

Use one of these sockets to connect a SuperStack II Redundant Power System (RPS) to the unit. You can use either socket. Refer to “Connecting a Redun-dant Power System (RPS)” on page 2-6.

t Button

Using the reset button simulates a power-off/on cycle. This has the same effect as carrying out a reset via the VT100 interface; refer to “Resetting the Desktop Switch” on page 4-27.

sole Port

Connect a terminal to the console port to carry out remote or local out-of-band configuration and man-agement. The console port is set to auto-baud, 8 data bits, no parity, and 1 stop bit.

Plug-in Module Slot

Use this slot to install a Plug-incan be used to provide a highof your network. 3Com providModules; contact your supplie

When a Plug-in Module is notblanking plate is secured in pl

Transceiver Module Slot

Use this slot to connect a Tranprovide a 10Mbps link to the Port 1 is automatically switche10BASE-T port to the Transceiwhen a Module is installed. 3Cof Transceiver Modules; contacavailability.

When a Transceiver Module isthe blanking plate is secured i

Ethernet Address

This label shows the unique Etaddress assigned to the unit.


Unit DTth

o the Desktop rface. You can r a PC using ter- connect the ter-ugh a modem.

erface remotely IP protocol.

le using a Net-cend® product is SNMP (Simple d any

can manage the n Base (MIB) is ent workstation. P over both IP

Port Stat

Forward

IntelligenManagem

Duplex M

Virtual L

PACE

Spanning(STP)

Power O(POST)

System A(broadcawidth us

System A(errors ppackets)

System A(bandwi

System A(percentaframes f

efaultshe following table shows the factory defaults for e Desktop Switch features.

Managing the Desktop SwitchThe menu-driven interface built intSwitch is known as the VT100 inteaccess it using a VT100 terminal, ominal emulation software. You canminal directly to the Switch or throYou can also access the VT100 intusing Telnet running over the TCP/

Remote management is also possibwork Manager from 3Com’s Transrange. The management protocol Network Management Protocol) anSNMP-based management facility unit if the Management Informatioinstalled correctly in the managemThe Desktop Switch supports SNMand IPX protocols.

us Enabled

ing Mode Fast Forward

t Flow ent

Enabled

ode Half duplex on all relevant ports

ANs All ports use Port VLAN Mode and belong to the Default VLAN (VLAN 1)

Disabled

Tree Disabled

n Self Test Normal (Fast Boot)

larm st band-ed)

Enabled

■ High threshold: 20% — Notify and Blip

■ Low threshold: 10% — No action

larm er 10,000

Enabled

■ High threshold: 2% — Notify


larmdth used)

Enabled

■ High threshold: 85% — No action


larmge of

orwarded)

Enabled

■ High threshold: 85% — No action


r SNMP Users 1-13

Qui

Ente

ess [Return] to dis-using the default d is required). Select

rom this menu, select ion. The Switch Man-yed.

reen, fill in the follow-

essary)

)

Management Setup e Switch for Manage-

h to send SNMP traps may need to set up anager in the Trap ps” on page 4-24.

as Transcend Enter-ay automatically con-end traps to them. supplied with your

e.

the Management

Quick Start Fo

ck Start For SNMP UsersThis section describes how to get started if you want to use an SNMP Network Manager to manage the Switch. It assumes you are already familiar with SNMP management.

■ If you are using IP and you have a BOOTP server set up correctly on your network, the IP address for the Switch is detected automatically and you can start managing the Switch without any fur-ther configuration.

■ If you are using the IPX protocol, the Desktop Switch is allocated an IPX address automatically. You can start the SNMP Network Manager and begin managing the Switch.

■ If you are using IP without a BOOTP server, you must enter the IP address of the Switch before the SNMP Network Manager can communicate with the device. To do this, refer to "Entering an IP Address for the Switch" below.

If you need more information about IP and IPX, refer to Chapter 3.

ring an IP Address for the Switch

1 Connect a terminal to the console port of the Desk-top Switch (refer to “Connecting a VT100 Termi-nal” on page 2-7). The terminal should be configured to 9600 line speed (baud rate), 8 data bits, no parity, and 1 stop bit.

2 Press [Return] one or more times until the Main Banner screen appears.

3 At the Main Banner screen, prplay the Logon screen. Logon user name admin (no passworOK.

4 The Main Menu is displayed. Fthe MANAGEMENT SETUP optagement Setup screen is displa

5 On the Management Setup scing fields:

■ Device IP Address

■ Device SubNet Mask (if nec

■ Default Router (if necessary

For further information on thescreen, refer to “Setting Up thment” on page 3-6.

6 If you need the Desktop Switcto the Network Manager, you the address of the Network MTable. Refer to “Setting Up Tra

3Com Network Managers suchprise Manager for Windows mfigure the Desktop Switch to sPlease read the documentationnetwork management softwar

7 When you have finished with Setup screen, select OK.


fetaops,n

eopanch

elyseunnd

h.

id

ad i

it ea

e such as radios, nd amplifiers.

ent lighting fixtures.

nter the case of the

d through the vents in estricted. We recom-inimum of 25mm

p of the unit.

than four high if

2

Following SaBefore insthe Desktprocedureprovided i

Positioning thThe Desktwhere it cdard 19-inAlternativwiring clo/ rack-mobrackets atop Switc

When decthat:

■ You aredetaile

■ The unnected

INSTALLATION AND SETUP

ty Informationlling or removing any components from Switch or carrying out any maintenance you must read the safety information Appendix A of this guide.

Desktop Switch Switch is suitable for use in the office be wall-mounted, mounted in a stan- equipment rack, or free standing.

, the unit can be rack-mounted in a t or equipment room. A wall-mounting ting kit, containing two mounting six screws, is supplied with the Desk-

ing where to position the unit, ensure

ble to meet the configuration rules n the following section.

is accessible and cables can be con-sily.

■ Cabling is away from:

■ Sources of electrical noistransmitters and broadba

■ Power lines and fluoresc

■ Water or moisture cannot eunit.

■ Air-flow around the unit anthe side of the case is not rmend that you provide a m(1in.) clearance.

■ No objects are placed on to

■ Units are not stacked more free-standing.

2-2 CHAPTER 2: INSTALLATION AND SETUP

ConfigTsFvF

T

■

■

■

uplexuplex support for rnet ports, and orts. Full duplex d received simul-

he potential

logy rules are the re:

00m (328ft) over

wed for connect-ion-to-switch.

uration Rules for Fast Ethernethe topology rules for 100Mbps Fast Ethernet are lightly different to those for 10Mbps Ethernet. igure 2-1 illustrates the key topology rules and pro-ides examples of how they allow for large-scale ast Ethernet networks.

he key topology rules are:

Maximum UTP cable length is 100m (328ft) over category 5 cable.

A 412m (1352ft) fiber run is allowed for connect-ing switch to switch, or endstation to switch, using half-duplex 100BASE-FX.

A total network span of 325m (1066ft) is allowed in single-repeater topologies (one hub stack per wiring closet with a fiber run to the collapsed backbone). For example, a 225m (738ft) fiber downlink from a repeater to a router or switch, plus a 100m (328ft) UTP run from a repeater out to the endstations.

Configuration Rules with Full DThe Desktop Switch provides full dall its fixed Ethernet and Fast Ethethe Fast Ethernet Plug-in Module pallows frames to be transmitted antaneously and, in effect, doubles tthroughput of a link.

With full duplex, the Ethernet toposame, but the Fast Ethernet rules a

■ Maximum UTP cable length is 1category 5 cable.

■ A 2km (6562ft) fiber run is alloing switch-to-switch, or endstat

ith Full Duplex 2-3

Figure

Configuration Rules w

2-1 Fast Ethernet configuration rules


Installi

Rack M

Ts

CSp

1 Pfa

2 LhF

Figure 2-2

hten with a suit-

r side of the unit.

k and secure with ure that ventila-

o four units can If mixing a variety nits, the smaller p.

lf-adhesive rubber side of the unit, at each corner of each other, ensur-t line up with the

ng the Desktop Switch

ounting

he Desktop Switch is 1.5U high and will fit in most tandard 19-inch racks.

AUTION: Disconnect all cables from the Desktop witch before continuing. Remove all self adhesive ads from the underside of the unit, if fitted.

lace the unit the right way up on a hard flat sur-ce, with the front facing towards you.

ocate a mounting bracket over the mounting oles on one side of the unit, as shown in igure 2-2.

Fitting a bracket for rack mounting

3 Insert the three screws and fully tigable screwdriver.

4 Repeat steps 2 and 3 for the othe

5 Insert the unit into the 19-inch racsuitable screws (not provided). Enstion holes are not obstructed.

6 Connect network cabling.

Stacking the Switch and Other Units

If the units are free standing, up tbe placed on top of one another. of SuperStack II Switch and Hub uunits must be positioned at the to

The Switch is supplied with four sepads. Apply the pads to the understicking a pad in the marked area the unit. Place the units on top of ing that the pads of the upper unirecesses of the lower unit.

esktop Switch 2-5

Wal

ting

Installing the D

l Mounting

A single Desktop Switch can be wall-mounted.

CAUTION: Disconnect any cables from the unit before continuing. Remove self-adhesive pads from the underside of the unit if they have been previ-ously fitted.

1 Place the Desktop Switch the right way up on a hard flat surface, with the front facing towards you.

2 Locate a mounting bracket over the mounting holes on one side of the unit, as shown in Figure 2-3.

3 Insert the two screws and tighten with a suitable screwdriver.

4 Repeat for the other side of the unit.

5 Ensure that the wall you are going to use is smooth, flat, dry, and sturdy. Attach a piece of plywood, approximately 305mm x 510mm x 12mm (12in. x 20in. x 0.5in.) securely to the wall if necessary, and mount the Desktop Switch as follows:

a Position the base of the unit against the wall (or plywood) ensuring that the ventilation holes face sidewards. Mark on the wall the position of the screw holes in both wall brackets. Drill the four holes.

b Using suitable fixings and screws (not provided), attach the Desktop Switch unit securely to the wall or plywood.

c Connect network cabling.

Figure 2-3 Fitting a bracket for wall moun


Power1 C

re

Toth

2 TtioMtothta

3 Ca

System (RPS)er System (RPS)

r the Desktop ceiver Module a Plug-in supplied with sumption figures.

only one Super-e connected to ar of the unit.

Desktop Switch xceeds the capa-

a SuperStack II RPS 100W mod-

utput Fault LED

ion supplied with the outputs can

ing-Up the Switchonnect the power cord to the IEC socket on the ar of the Switch, and to your mains socket.

he Switch has no ON/OFF switch; the only method f connecting or disconnecting mains power is rough the power cord.

he Switch enters a Power On Self Test (POST). The me taken for the test to complete is dependent n the type of POST configured (refer to "Switch anagement Setup" on page 3-9 for details of how configure the type of POST.) For a new Switch at is being installed for the first time, power-up kes approximately 13 seconds.

heck the status LEDs to ensure the Switch is oper-ting correctly (refer to "LEDs" on page 1-9).

Connecting a Redundant PowerYou can connect a Redundant Powto the Switch.

At +5V, the current requirement foSwitch is 4.8A, including any Transthat might be fitted, but excludingModule. Check the documentationyour Plug-in Module for power con

For most configurations, you needStack II RPS output, and this can beither of the two sockets on the re

If the current consumption of the plus any optional Plug-in Module ebility of the RPS (8.5A), you need Advanced RPS with one Advancedule.

If the RPS is used incorrectly, its Olights yellow.

You should check the documentatthe RPS or Advanced RPS to see ifbe used in parallel.

e Console Port 2-7

Con irectly to the console ou need a standard

to the console port e other to the con-al.

t to:

d for the Switch, the e) is detected auto-

ulator

running a suitable here are many avail-r for further details.

d a null modem nector. Connect one tation, and the other e Desktop Switch.

s set to:

d for the Switch, the rate) is detected

Connecting Equipment to th

necting Equipment to the Console PortThe Switch console port settings are set to:

■ 8 data bits

■ no parity

■ 1 stop bit

The terminal connected to the console port on the Desktop Switch must be configured with the same settings. This procedure is described in the docu-mentation supplied with the terminal. If you have enabled auto-configuration for the Desktop Switch, the terminal’s line speed (baud rate) is detected automatically.

Connection to the console port can be direct for local management, or through a modem for remote management. The maximum baud rate the auto-configuration detects is 19,200 baud.

Appropriate cables are available from your local sup-plier. If you need to make your own cables, pin-outs are detailed in Appendix D.

Connecting a VT100 Terminal

To connect a VT100 terminal dport on the Desktop Switch, ynull modem cable:

1 Connect one end of the cableon the Desktop Switch, and thsole port on the VT100 termin

2 Ensure that your terminal is se

■ 8 data bits

■ no parity

■ 1 stop bit

If auto-configuration is enableterminal’s line speed (baud ratmatically.

Connecting a VT100 Terminal Em

1 Ensure that the workstation isterminal emulation package. Table; contact your local supplie

2 If you are using a PC, you neecable with an appropriate conend of the cable to the worksend to the console port on th

3 Ensure that your workstation i

■ 8 data bits

■ no parity

■ 1 stop bit

If auto-configuration is enableworkstation’s line speed (baudautomatically.


Connec

Yth(SpS

Ctyumd

Ytop“

YT

ting a Workstation Running SLIP

ou can communicate with the Desktop Switch via e console port from a workstation running SLIP erial Line Internet Protocol). In this way, you can erform out-of-band management using Telnet or NMP.

ables required for this connection depend on the pe of workstation you are using. You must config-re the workstation to run SLIP. Refer to the docu-entation supplied with the workstation for more etails.

ou must configure the console port of the Desk-p Switch to accept SLIP and set up the SLIP

arameters (address and subnet mask). Refer to Switch Management Setup” on page 3-9.

ou may need a 5-wire cable when running SLIP. wo of the wires are required for Flow Control.

aa

hel

re)

he wio

he rurt

nunrk th

0

-dh irfa fveusr mple

gement communica-through two different

ou can access the using a VT100 termi-lator using suitable . The terminal can Desktop Switch, or also connect a man-ng SLIP to the con- to use out-of-band be connected a modem. This anaging the Switch

is not providing a etwork Manager nnectivity, or when a

support SNMP.

n — The local man-ssible via Telnet over a protocol. The man-Telnet is exactly the nnected terminal. The VT100 terminal or oftware.

3

Methods of MYou can m

■ Using tterminasoftwa

■ Using tusing aemulat

■ Using tstationsole po

■ Using awork rNetwoface to

Using the VT10

The menutop Switcment inteprovides asecurity leparticular up to fou(for examnections).

SETTING UP FOR MANAGEMENT

naging the Desktop Switchnage the Desktop Switch in four ways:

VT100 interface by connecting a VT100 (or workstation with terminal emulation to the Desktop Switch console port.

VT100 interface over a TCP/IP network orkstation running VT100 terminal

n and Telnet.

VT100 interface by connecting a work-nning SLIP to the Desktop Switch con-

.

SNMP Network Manager over a net-ning either the IP or IPX protocol. Each Manager provides its own user inter-e management facilities.

Management Interface

riven user interface built into the Desk-s known as the VT100 or Local Manage-ce. The VT100 management interface orms-based structure with pre-defined ls, enabling access to be restricted to ers. The Desktop Switch can support anagement user sessions concurrently one console port and three Telnet con-

You can establish VT100 manation with the Desktop Switch interfaces:

■ Via the Console Port — Ylocal management interfacenal, PC or any terminal emuterminal emulation softwarebe connected directly to thethrough a modem. You canagement workstation runnisole port, which allows youTelnet. The workstation candirectly or remotely, throughmethod provides a way of min situations where the LANreliable service, where the Ndoes not have direct LAN coNetwork Manager does not

■ Via a Network Connectioagement facility is also accenetwork running the TCP/IPagement available through same as that of a locally coTelnet application requires aPC with VT100 emulation s

3-2 CHAPTER 3: SETTING UP FOR MANAGEMENT

Using T

AsSTcinto

Bum

TaCfa

Wbp

e Simple Network manage the (Management ctly on the man-

s own user inter- 3Com's Tran- all have facilities

P over both IP

sses that may be our network

n your network addresses have cimal number P address is:

o parts:

ample) identifies e resides.

example) identi-rk.

elnet

ny Telnet facility that emulates a VT100 terminal hould be able to communicate with the Desktop witch over a TCP/IP network. Up to three active elnet sessions can access the Desktop Switch con-urrently. If a connection to a Telnet session is lost advertently, the connection is closed by the Desk-p Switch after 2–3 minutes of inactivity.

efore you can start a Telnet session you must set p the IP parameters described in “Switch Manage-ent Setup” on page 3-9.

o open the Telnet session, you must specify the IP ddress of the device that you want to manage. heck the user manual supplied with the Telnet cility if you are unsure how to do this.

hen the connection is established, the main anner of the VT100 management interface is dis-layed and you can log on.

Managing Over The NetworkAny Network Manager running thManagement Protocol (SNMP) canDesktop Switch, provided the MIBInformation Base) is installed correagement workstation.

Each Network Manager provides itface to the management facilities.scend range of Network Managersfor managing the Desktop Switch.

The Desktop Switch supports SNMand IPX protocols.

IP Addresses

If you are uncertain about IP addreassigned to your devices, contact yadministrator first.

To operate correctly, each device omust have a unique IP address. IP the format n.n.n.n where n is a debetween 0 and 255. An example I191.128.40.120

The IP address can be split into tw

■ The first part (191.128 in the exthe network on which the devic

■ The second part (40.120 in the fies the device within the netwo

r The Network 3-3
Managing Ove
If your network is internal to your organization only, you may use any arbitrary IP address. We sug-gest you use addresses in the series 191.100.X.Y, where X and Y are numbers between 1 and 254. Use 191.101.X.Y for the SLIP address.

If your network has a connection to the external IP network, you will need to apply for a registered IP address. This system ensures that every IP address used is unique; if you do not have a registered IP address, you may be using an identical address to someone else and your network will not operate correctly.

Obtaining a Registered IP Address

InterNIC Registration Services is the organization responsible for supplying registered IP addresses. The following contact information is correct at the time of publication:

Network SolutionsAttn: InterNIC Registration Service505, Huntmar Park DriveHerndonVA 20170U.S.A.

Telephone: (1) (703) 742 4777

If you have access to the Internet, you can find fur-ther information about InterNIC by entering the fol-lowing URL into your web browser:

http://www.internic.net


Navigating

Screen Conve

To differe

use the f

Type ofinforma

Choice F only. Press [Space] to next field.

Entry Fie ry field allows you to d fields are hidden, cases an entry field value for this field; next field.

Button t an action, for tton and press

List Box veral keys that allow

cts an entry in the

nd of the list. At

the VT100 Screens

ntions

ntiate types of information, the VT100 screens ollowing conventions:

tion

Shown on screen as...

Description

ield ♦text ♦ Text enclosed with markers is a list from which you can select one option cycle through the options. Press [Down Arrow] or [Return] to move to the

ld [text ] Text enclosed in square brackets on the screen is a text entry field. An ententer text, numeric data or hexadecimal data from the keyboard. Passworwhich means that the text you type is not shown on the screen. In some has a default entry. If you wish to replace the default, simply enter a newthe default entry is erased. Press [Down Arrow] or [Return] to move to the

OK Text for a button is always shown in uppercase letters. A button carries ouexample, OK or CANCEL. To operate a button, move the cursor to the bu[Return].

monitor

manager

security

A list box allows you to select one or more items from a list. There are seyou to use a list box.

[Return] moves the cursor to the next field and actions your selections.

[Space] toggles through the options in a choice field or selects and deselelist box. List box selections are highlighted.

[Down Arrow] moves item by item down the list box until it reaches the ethe end of the list it moves the cursor to the next field.

[Ctrl] + [U] moves the cursor one page up the list box.

[Ctrl] + [D] moves the cursor one page down the list box.

T100 Screens 3-5

Key

inal or [Backspace] on ne space to the left

minal emulation proof the Control keys tivate other functions. accompanying your

oftware before using

Navigating the V

board Shortcuts

There are several special characters or combinations of characters that allow you to make shortcuts.

[Tab] allows you to move from one field to the next, on any screen, without making any changes.

[Return] moves you to the next field on a form after you have made changes to the data in a field.

[Left Arrow] moves you to the previous field on the screen or the next character in an editable field.

[Right Arrow] moves you to the next field on the screen or the previous character in an editable field.

[Ctrl] + [R] refreshes the screen.

[Ctrl] + [B] moves the cursor to the next button.

[Ctrl] + [P] aborts the current screen and returns you to the previous screen.

[Ctrl] + [N] actions the inputs for the current screen and moves to the next screen.

[Ctrl] + [K] displays a list of the available key strokes.

Correcting Text Entry

Use [Delete] on a VT100 terma PC. This moves the cursor oand deletes a character.

If you are using Telnet or a tergram you may find that somedo not operate or that they acCheck carefully in the manual Telnet or terminal emulation sthe Control keys.


Setting

Tymfam

“ISP

■

■

■

o or more times ner is displayed port detects the keystrokes and

s cannot be y set up with isplayed as soon

to display the

Up the Switch for Management

he following sections describe how to get started if ou want to use an SNMP Network Manager to anage the Switch. It assumes you are already miliar with SNMP management. If not, we recom-end the following publication:

The Simple Book” by Marshall T. RoseBN 0-13-812611-9ublished by Prentice Hall

If you are using IP and you have a BOOTP server set up correctly on your network, the IP address for the Switch is detected automatically and you can start managing the Switch without any fur-ther configuration.

If you are using the IPX protocol, the Desktop Switch is allocated an IPX address automatically. You can start the SNMP Network Manager and begin managing the Switch.

If you are using IP without a BOOTP server, you must enter the IP address of the Switch before the SNMP Network Manager can communicate with the device. To do this, take the following steps:

Figure 3-1 Main Banner

1 At your terminal, press [Return] twuntil the Desktop Switch Main Ban(shown in Figure 3-1). The consoleline speed (baud rate) from these defaults to:

■ auto-baud

■ 8 data bits

■ no parity

■ 1 stop bit

Data bits, parity, and stop bit valuechanged. If your terminal is alreadthese values, the Main Banner is das power-up is complete.

2 At the Main Banner, press [Return]Logon screen.

Management 3-7

Log

Table

User

mon

man

secu

adm

Setting Up the Switch for

ging On

At the Logon screen displayed in Figure 3-2, enter your user name and password (note that they are both case-sensitive):

■ If you have been assigned a user name and pass-word, enter those details.

■ If you are logging on for the first time (after installation or initialization), use a default user name and password to match your access requirements. The defaults are shown in Table 3-1. If you are setting up the Switch for management, we suggest that you log on first as admin.

Figure 3-2 Logon screen

3-1 Default Users

Name DefaultPassword

Access Level

itor monitor monitor — this user can view, but not change all manageable parame-ters

ager manager manager — this user can access and change the operational parameters but not special/security features

rity security security — this user can access and change all manageable parameters

in (no password) security — this user can access and change all manageable parameters


A

Wtosos

IfSCSin

AhsA

Ifus

■

■

■

fter Logging On

hen you have successfully logged on to the Desk-p Switch, the Main Menu screen appears as

hown in Figure 3-3. From here, you can select the ptions needed to manage the unit. Refer to the creen map on page 4-1.

you have installed an ATM OC-3c Module into the witch, the Main Menu screen contains an ATM ONFIGURATION option. Refer to the “SuperStack II witch ATM OC-3c Module User Guide” for more formation.

ccess to options depends on the access level you ave been assigned. Access rights to the VT100 creens for the Desktop Switch are listed in ppendix B.

you are a user with security access level, and are sing the management facility for the first time, we uggest that you:

Assign a new password for your user, using the Edit User screen, as described in “Editing User Details” on page 4-5.

Log on as each of the other default users, and change their passwords using the Edit User screen.

Create any new users, in addition to the default ones. To do this, you assign each a user name, password and security level, as described in “Cre-ating a New User” on page 4-3.

Figure 3-3 Main Menu screen

Management 3-9

Swi

e Memory) tests

tests

tegrated Circuit) tests

rface test

arding tests

ry tests

the Switch performs ke up to 70 seconds performs an ore extensive system ry tests in addition to lt setting for the field


tch Management Setup

The Management Setup screen allows you to con-figure IP, IPX, and SLIP parameters for the Desktop Switch. This screen also allows you to display screens for setting up the console port and traps.

To access the Setup screen, from the Main Menu screen, select the MANAGEMENT SETUP option. The Setup screen is displayed, as shown in Figure 3-4.

If you change some of the following parameters, the Switch must be reset for the change to take effect. Reset the Switch by selecting OK and press-ing the Reset button on the rear of the unit. Refer to “Reset Button” on page 1-11.

The screen shows the following:

MAC Address This read-only field shows the MAC address of the Switch unit, which is required for management.

Power On Self Test Type Normal / Extended This field allows you to determine the type of self-test that the Switch carries out when it is powered-up. If the field is set to Normal, the Switch performs a Fast Boot — a basic confidence check lasting approximately 13 seconds. When the Switch per-forms a Fast Boot, it carries out the following tests:

■ Checksum test of boot and system areas of Flash memory

■ System memory tests

■ MAC address verification test

■ System timer test

Figure 3-4 Management Setup screen

■ CAM (Contents Addressabl

■ Console port tests

■ Internal packet forwarding

■ ASIC (Application Specific In

■ ASIC memory tests

■ Switch–Plug-in Module inte

■ Plug-in Module packet forw

■ Plug-in Module ASIC tests

■ Plug-in Module ASIC memo

If the field is set to Extended, an Extended test which may tato complete. When the SwitchExtended test, it carries out mmemory tests and ASIC memothe Fast Boot tests. The defauis Normal.


IfSte(rp

IfthnEd

Dakwc

Ds2sS

Dnm

BewSmssa

, enter an address o the network r more informa-trator. You must

is parameter.

le subnet mask. is suitable. For twork administra-r changing this

llowing four protocol that can

hows the address his address is al IPX router or t need to change

e node address omatically.

eld is set to edium-access pro-ou wish to pre-

field shows the tocol.

o display the Trap setup is page 4-24.

you suspect that there is a problem with the witch that has not been detected by the Normal sts, set this field to Extended and reset the Switch efer to “Resetting the Desktop Switch” on age 4-27).

you set the Switch to perform an Extended test, e Switch must be isolated from the rest of your

etwork when it is powered-up. The Switch fails an xtended test if it receives any network traffic uring the test.

evice IP Address If you are using IP, a unique IP ddress must be specified in this field. If you do not now the IP address of the Switch, consult your net-ork administrator. You must reset the Switch after

hanging this parameter.

evice SubNet Mask If you are using IP, enter a uitable network mask. For a Class B IP address, 55.255.0.0 is suitable. For more information, con-ult your network administrator. You must reset the witch after changing this parameter.

efault Router If a default router exists on your etwork, enter the IP address of the router. You ust reset the Switch after changing this parameter.

OOTP Select Enabled / Disabled If BOOTP is nabled and you have a BOOTP server on your net-ork, an IP address is automatically mapped to the witch when it is first powered-up. In addition to apping an IP address, BOOTP can also assign the

ubnet mask and default router. Using a BOOTP erver avoids having to configure devices individu-lly.

SLIP Address If you are using SLIPthat has a network part different taddress of the Desktop Switch. Fotion, consult your network adminisreset the Switch after changing th

SLIP SubNet Mask Enter a suitabFor a Class B address, 255.255.0.0more information, consult your netor. You must reset the Switch afteparameter.

There are four entries under the fofields; one for each data link layer be used by IPX:

IPX Network This read-only field sof the network for this protocol. Tlearned automatically from the locNetWare File Server, and you do noit.

Node This read-only field shows thof the Switch which is learned aut

Status Enabled / Disabled If this fiEnabled, you have access to the mtocol. Set this field to Disabled if yvent access for security reasons.

Data Link Protocol This read-onlyname of the IPX data link layer pro

SETUP TRAPS Select this button tsetup screen for trap parameters. described in “Setting Up Traps” on

Management 3-11
CONSOLE PORT Select this button to display the setup screen for console port parameters. Console port setup is described in “Setting Up the Console Port” on page 4-25.


Logging

Ifinbthsc

Auto Lo

Tinuinpthtod

Trepamre

Off

you have finished using the VT100 management terface, select the LOGOFF option from the ottom of the Main Menu screen. If you accessed e VT100 management interface using a Telnet ses-

ion or modem connection, the connection is losed automatically.

gout

here is a built-in security timeout on the VT100 terface. If you do not press any keys for three min-tes, the management facility warns you that the activity timer is about to expire. If you do not ress a key within 10 seconds, the timer expires and e screen is locked; any displayed statistics continue be updated. When you next press any key, the

isplay changes to the Auto Logout screen.

he Auto Logout screen (shown in Figure 3-5) quests you to enter your password again. If the assword is correctly entered, the screen that was ctive when the timer expired is displayed. If you ake a mistake entering your password, you are turned to the Logon screen.

Figure 3-5 Auto Logout screen

MANAGIN

Screen map

4, 5 and 6 describe all r the Desktop Switch. ese chapters, you may

w useful.

the er to the ule User

4

Figure 4-1

Chapters facilities fosteps in thmap belo

G THE DESKTOP SWITCH

management While following find the screen

If an ATM OC-3C Module is installed inSwitch, extra screens are available. Ref“SuperStack II Switch ATM OC-3C ModGuide” for more information.

4-2 CHAPTER 4: MANAGING THE DESKTOP SWITCH

SettingFTF

F

■

■

■

■

Up Usersrom the Main Menu, select USER ACCESS LEVELS. he User Access Levels screen appears as shown in igure 4-2.

rom this screen you can access:

LOCAL SECURITY screen — This allows you to set up access levels for users on the Switch.

CREATE USER screen — This allows you to create up to ten users in addition to the default users set up on the Switch.

DELETE USERS screen — This allows you to delete users from the Desktop Switch. The default users cannot be deleted.

EDIT USER screen — This allows you to change your own password and community string. You cannot change details for other users.

Figure 4-2 User Access Levels screen

g a New User 4-3

Cre

t, a community string enerated. You can of 32 characters or nly needed for SNMP te SNMP Network

g specified in the Net-t be the same as that

g that is greater than o 32 characters.

Creatin

ating a New UserThese steps assume the User Access Levels screen is displayed.

1 Select the CREATE USER option. The Create User screen is displayed, as shown in Figure 4-3.

2 Fill in the fields and assign an access level for the new user.

3 When the form is complete, select OK.

The Create User screen shows the following fields:

User Name Type in the name of this new user. The name can consist of up to 10 characters and is case-sensitive.

Password Type in the password for this new user. The password can consist of up to 10 characters and is case-sensitive. For security reasons, the pass-word is not displayed on screen.

Access Level Assign an access level for this new user, as follows:

■ monitor — access to view, but not change, a subset of the manageable parameters of the Switch

■ secure monitor — as monitor

■ manager — access to all the manageable param-eters of the Switch, except security features

■ specialist — as manager

■ security — access to all manageable parameters of the Switch

Figure 4-3 Create User screen

Community String By defaulidentical to the user name is gchange this to any text string less. The community string is oaccess. If you are using a remoManager, the community strinwork Manager’s database musfor the device.

If you enter a community strin32 characters, it is truncated t


DeletinTd

1 Ss

2 Uwu

3 S

g a Userhese steps assume the User Access Levels screen is isplayed.

elect the DELETE USERS option. The Delete Users creen is displayed, as shown in Figure 4-4.

se the spacebar to highlight the user that you ant to delete. Note that you cannot delete default sers or the current user (that is, yourself).

elect DELETE USERS.

Figure 4-4 Delete Users screen

g User Details 4-5

Edit

Editin

ing User DetailsThese steps assume the User Access Levels screen is displayed.

1 Select the EDIT USER option. The Edit User screen is displayed, as shown in Figure 4-5.

2 Fill in the fields as required.

3 When you have completed the changes, select OK.

The Edit User screen shows the following fields:

User Name This read-only field shows the name of the user. This field cannot be changed; if you need to change the user name, you must delete this user and create a new one.

Old Password To change the user’s password, you need to enter the current password in this field.

New Password This field allows you to enter a new password for the user.

Confirm Password Re-enter the new password into this field.

Community String This field allows you to enter a community string for the user.

If you forget your password while logged out of the Desktop Switch VT100 interface, contact your local technical support representative who will advise on your next course of action.

Figure 4-5 Edit User screen


AssignTfoC

Td

1 Sri

2 F

3 W

A

CtodCca

Rctoim

Ctorehctos

ing Local Securityhe Local Security screen shows a matrix of options r access method (Console Port, Remote Telnet, ommunity-SNMP) and access level.

hese steps assume the User Access Levels screen is isplayed.

elect the LOCAL SECURITY option. The Local Secu-ty screen is displayed, as shown in Figure 4-6.

ill in the fields as required.

hen you have filled in the form, select OK.

ccess options are:

onsole Port Enabled / Disabled To prevent access the management facilities via the console port,

isable access to the facility for each access level. onsole port access for Security is enabled and annot be changed. This prevents accidental dis-bling of all access levels from management.

emote Telnet Enabled / Disabled Telnet is an inse-ure protocol. You may want to disable all access the management facilities via Telnet if there is portant or sensitive data on your network.

ommunity-SNMP Enabled / Disabled The Desk-p Switch can be managed via SNMP using a mote Network Manager. Community-SNMP does ave some simple security features, but it is an inse-ure protocol. You may want to disable all access the management facilities if there is important or

ensitive data on your network.

Figure 4-6 Local Security screen

agement Level 4-7

Cho

Port level

Unit level

screens for manag-P) information for have chosen (port or e Protocol" on page

Choosing a Switch Man

osing a Switch Management LevelThe Switch Management screen lets you:

■ Choose between managing a port, the unit, or a VLAN

■ Display screens for setting up the Switch

■ Display a screen for managing the Switch Data-base

■ Display screens for managing resilient links

■ Display screens for managing STP

■ Display screens showing statistics

From the Main Menu, select SWITCH MANAGE-MENT. The Switch Management screen is displayed, as shown in Figure 4-7.

Management Level Port / Unit / VLAN If you choose Port, the screen is appears similar to Figure 4-7, and all options at the foot of the screen relate to an individual port. If you choose Unit, the screen appears similar to Figure 4-8, and all options relate to the Switch unit. If you choose VLAN, the screen appears similar to Figure 4-9, and all options relate to VLANs.

Port ID 1 / 2 / 3 ... 24 / 25 / 26 If you choose to manage the Desktop Switch at port level, enter the particular port number into this field before select-ing the next screen. Ports 1–24 are the 10BASE-T ports, port 25 is the Plug-in Module port at the rear of the unit, and port 26 is the 100BASE-TX port.

Figure 4-7 Switch Management screen for

Figure 4-8 Switch Management screen for

STP Use this button to displaying Spanning Tree Protocol (STthe level of management you VLAN). Refer to "Spanning Tre5-12.


SMwSS

Ssmti(V

Sfoo

SVD4

RmyU

YSb

N level

setup screens for chosen (port, ut the Port r to "Setting Up the Switch Unit" out the VLAN VLANs on the

TP is not supported over Asynchronous Transfer ode (ATM). Consequently, if you specify that you ant to manage the Plug-in Module and the witch has an ATM OC-3c Module installed, the TP button is not displayed.

ERVER Use this button to display the VLAN Server creen, used for entering the IP address and com-unity string of a VLAN server. For more informa-on about VLAN servers, refer to "Virtual LANs LANs)" on page 5-1.

TATS Use this button to display statistics screens r the level of management you have chosen (port

r unit). Refer to Chapter 6.

DB Use this button to display the Unit Database iew screen, which is used to manage the Switch atabase. Refer to "The Database View" on page -17.

ESILIENCE Use this button to display resilient link anagement screens for the level of management

ou have chosen (port or unit). Refer to "Setting p Resilient Links" on page 4-19.

ou cannot set up resilient links if the Switch uses panning Tree (STP). Consequently, the RESILIENCE utton is not displayed if STP is enabled.

Figure 4-9 Switch Management screen for VLA

SETUP Use this button to display the level of management you haveunit or VLAN). For information aboSetup and Unit Setup screens, refethe Switch Ports" and "Setting Upin this chapter. For information abSetup screen, refer to "Setting UpSwitch" on page 5-8.

e Switch Unit 4-9

Set

ived packets are buff-o forwarding. This es are passed to their delay for this mode .2ms, depending on the latency, measured ng the last bit of the first bit, is 8µs.

onitors the amount ork and changes the ly. If the Switch a second, it operates e Switch detects nd, it operates in til the number of

orward / Store and ows the forwarding is set to Intelligent.

Setting Up th

ting Up the Switch UnitWith the Switch Management screen displayed, choose the management level Unit, then select the SETUP button.

The Unit Setup screen is displayed, as shown in Figure 4-10. The screen shows the following:

Unit Name This read-only field shows the type of device.

sysName This field takes its name from the MIB II System Group object. You can edit the first 30 char-acters of this field to make the name more mean-ingful. This name is displayed on the Main Banner when you first access the VT100 screens, and is also accessible to an SNMP Network Manager.

Forwarding Mode Fast Forward / Fragment Free / Store and Forward / Intelligent This field allows you to set the forwarding mode for the Switch:

■ Fast Forward — Frames are forwarded as soon as the destination address is received and verified. The forwarding delay, or latency, for all frames in this mode is just 40µs but with the lack of check-ing time, error frames are propagated onto the network.

■ Fragment Free — A minimum of 512 bits of the received frame is buffered prior to the frame being forwarded. This ensures that collision frag-ments are not propagated through the network. The forwarding delay, or latency, for all frames in this mode is 64µs.

Figure 4-10 Unit Setup screen

■ Store and Forward — Receered in their entirety prior tensures that only good framdestination. The forwardingvaries between 64µs and 1frame length. In this mode as the time between receiviframe and transmitting the

■ Intelligent — The Switch mof error traffic on the netwforwarding mode accordingdetects less than 18 errors in Fast Forward mode. If thmore than 18 errors a secoStore and Forward mode unerrors returns to zero.

Intelligent Forwarding Fast FForward This read-only field shstate if the Forwarding Mode


PeEmntu

■

■

Inthoatili

FAP

/ AutoSelect This rts on the Switch

Mode, which laced in the lt mode.

toSelect VLAN re automatically

referring to a ’s Transcend Enter-

ing AutoSelect

s you to specify r all non-perma-e of the unit. range 0 minutes minutes. If you or more informa-Setting Up the -16.

his field allows ing Tree Protocol

rmation about col" on page

ACE Enable / Disable This field allows you to nable or disable PACE (Priority Access Control nabled) for all ports on the Switch. PACE allows ultimedia traffic to be carried over standard Ether-et and Fast Ethernet LANs by providing two fea-res:

Implicit Class of Service — When multimedia traf-fic is transmitted, it is given a higher priority than other data and is therefore forwarded ahead of other data when it arrives at the Switch. The Implicit Class of Service feature minimizes latency through the Switch and protects the quality of multimedia traffic.

Interactive Access — When two-way multimedia traffic passes over an Ethernet network, interfer-ence can occur because access to the bandwidth is unequally allocated to traffic in one direction. The Interactive Access feature allocates the avail-able bandwidth equally in both directions, there-fore increasing the quality of the traffic.

teractive Access should be enabled only on ports at connect to a single endstation, switch, bridge,

r router. You should disable Interactive Access on port if it is connected to a repeater. Also, Interac-ve Access should be enabled at only one end of a nk.

or more information about disabling Interactive ccess for a port, refer to "Setting Up the Switch orts" on page 4-12.

VLAN Configuration Mode Port field allows you to specify how poare placed in VLANs:

■ Port — The ports use Port VLANmeans that they are manually prequired VLAN. This is the defau

■ AutoSelect — The ports use AuMode, which means that they aplaced in the required VLAN byVLAN Server database in 3Comprise Manager software.

For more information, refer to "UsVLAN Mode" on page 5-4.

SDB Ageing Time This field allowthe ageing time (hours:minutes) fonent entries in the Switch DatabasYou can set an ageing time in theto 277 hours, with a default of 30enter 0:00, ageing is turned off. Ftion about ageing times, refer to "Switch Database (SDB)" on page 4

Spanning Tree Enable / Disable Tyou to enable or disable the Spann(STP) on the Switch. For more infoSTP, refer to "Spanning Tree Proto5-12.

e Switch Unit 4-11

is read-only field dis-odule fitted to the t Fitted.

nal This read-only sktop Switch is receiv-

Power System. In all Internal.

Setting Up th

Duplex Mode Half Duplex / Full Duplex on 100M Ports / Full Duplex on All Ports This field allows you to set the duplex mode for ports that have Unit Default specified in the Duplex Mode field of the Port Setup screen. The default setting is Half Duplex. For more information about Duplex Mode, refer to "Setting Up the Switch Ports" on page 4-12.

Backbone Port 1 / 2 / 3 ... 24 / 25 / 26 If all the ports on the Switch belong to VLAN 1 and use Port VLAN Mode, this field allows you to specify a back-bone port for the Switch. In all other situations, the field is not displayed.

On a new or initialized Switch, all ports belong to VLAN 1 and use Port VLAN Mode.

For more information about VLANs, refer to "Vir-tual LANs (VLANs)" on page 5-1. For more informa-tion about backbone ports and their role in VLAN functionality, refer to "Assigning a Port to a VLAN When Using Port VLAN Mode" on page 5-10.

Default RMON Host/Matrix Enable / Disable This field allows you to specify whether Hosts and Matrix RMON sessions are defined on the default VLAN. The default setting for this field is Disable. For more information about RMON sessions, refer to "RMON" on page 5-22.

Plug-in Module Type This read-only field displays the type of Plug-in Module fitted to the rear of the unit, or displays Not Fitted.

Transceiver Module Type Thplays the type of Transceiver Mrear of the unit, or displays No

Power Supply Internal / Exterfield displays External if the Deing power from a Redundant other cases, this field displays


SettingWca

TF

IfPtiM

T

Py

Mty

Pad

Peap

Lfi

■

■

ws the number of the Switch was d is not zero, you ce any that may

each time an off/on cycle.

nable / Disable isable Intelligent

mizes packet loss l switches.

has full duplex

screen is set to Management

Up the Switch Portsith the Switch Management screen displayed,

hoose the management level Port. Choose the ppropriate port, then select the SETUP button.

he Port Setup screen is displayed as shown in igure 4-11.

the port is an ATM OC-3c Module port, the ATM ort Setup screen is displayed. For more informa-on, refer to the “SuperStack II Switch ATM OC-3c odule User Guide”.

he screen shows the following:

ort ID This read-only field shows the ID of the port ou have chosen to setup.

edia Type This read-only field shows the media pe of the link connected to this port.

ort Speed This read-only field shows the speed nd Duplex Mode of the link; HD indicates half uplex, and FD indicates full duplex.

ort State Enable / Disable This field allows you to nable or disable the port. To prevent unauthorized ccess, we recommend that you disable any unused orts.

ink State Present / Not Available This read-only eld shows the state of the link:

Present — The port is operating normally

Not Available — The link has been lost

Figure 4-11 Port Setup screen

Lost Links This read-only field shotimes the link has been lost since last reset. If the number in this fielshould check your cables and replabe damaged.

The Lost Links counter increments endstation goes through a power-

Intelligent Flow Management EThis field allows you to enable or dFlow Management (IFM). IFM miniwhich can occur with conventiona

IFM is not available on a port thatenabled:

■ If the Duplex Mode field in thisFull Duplex, the Intelligent Flowfield is not displayed

e Switch Ports 4-13

e Interactive Access he Switch Unit" on

This field allows you a VLT (Virtual LAN k (or VLT) is a rries traffic for all the te a VLT, the ports on VLT ports. For more o "VLANs and the

AN Mode (refer to field), you cannot ort.

ull Duplex / Unit specify the duplex

llows frames to be ultaneously and, in

l throughput of a link. supports p to 2km. You should link between the

with full duplex sup-

use half duplex if the the link does not sup-

mode of the port is e field in the Unit fault setting.

Setting Up th

■ In all other cases where the port has full duplex enabled, IFM has no effect

Security Enable / Disable When Security is enabled, the port enters single address learning mode. The Switch removes any address currently stored in the Switch Database against the port. The Switch then learns the source address from the first packet it receives on the port since Security was enabled.

Once the first address is learnt, no other endstation is permitted to access the network through the port. If an endstation with a different address attempts to transmit packets onto the network through the port, the port is automatically disabled and a trap is generated. The port remains disabled until it is enabled from the Port Setup screen or via SNMP management.

A more comprehensive set of security features is available through SNMP network management.

Security is not available on backbone ports. If the port has been defined as a backbone port, the Security field is not displayed.

Disable Interactive Access Yes / No This field allows you to disable the Interactive Access feature of PACE (Priority Access Control Enabled) on the current port. You should disable Interactive Access on a port if:

■ The port is connected to a device with Interac-tive Access enabled

■ The port is configured as a backbone port and is connected to a repeater

For more information about thfeature, refer to "Setting Up tpage 4-9.

VLT Mode Enabled / Disabledto specify whether the port is Trunk) port. A Virtual Lan TrunSwitch-to-Switch link which caVLANs on each Switch. To creaboth ends of the link must beinformation about VLTs, refer tSwitch" on page 5-3.

If the port uses AutoSelect VLthe VLAN Configuration Modespecify that the port is a VLT p

Duplex Mode Half Duplex / FDefault This field allows you tomode of the port:

■ Full Duplex — Full duplex atransmitted and received simeffect, doubles the potentiaIn addition, full duplex also100BASE-FX cable runs of uonly enable full duplex on aSwitch and another device port.

■ Half Duplex — You should device at the other end of port full duplex.

■ Unit Default — The duplex defined by the Duplex ModSetup screen. This is the de


FM

VUp

■

■

■

FV

Batoptooth

R

thpd

ws you to specify on the current r the port. The threshold

ly. The default is

le port / /notify Use this larm to take d:

ated

ed

s disabled and an

cast traffic on the

t and multicast r 5 seconds, and

n in the Rising n has been speci-not select this

ull duplex is not supported on the Transceiver odule port.

LAN Configuration Mode Port / AutoSelect / nit Default This field allows you to specify how the ort is placed in a VLAN:

Port — The port uses Port VLAN Mode, which means that the port is manually placed in the required VLAN.

AutoSelect — The port uses AutoSelect VLAN Mode, which means that the port is automatically placed in the required VLAN by referring to a VLAN Server database in 3Com’s Transcend Enter-prise Manager software.

Unit Default — The port uses Port VLAN Mode or AutoSelect VLAN Mode depending on the con-tents of the VLAN Configuration Mode field in the Unit Setup screen. This is the default setting.

or more information, refer to "Using AutoSelect LAN Mode" on page 5-4.

roadcast Storm Control The Desktop Switch utomatically creates an alarm on each of its ports monitor the level of broadcast traffic on each

ort. The Broadcast Storm Control fields allow you specify thresholds for the level of broadcast traffic

n a port, and specify an action to take place if the reshold is exceeded.

ising Threshold% This field allows you to specify e percentage of broadcast traffic on the current

ort which triggers the alarm for the port. The efault is 20%.

Falling Threshold% This field allothe percentage of broadcast trafficport required to reset the alarm fofalling threshold prevents the risingevents being triggered continuous10%.

Rising Action none / event / disabdisable port/notify / blip / blip portfield to specify the action for the awhen it reaches the rising threshol

■ none — no action takes place

■ event — an SNMP trap is gener

■ disable port— the port is disabl

■ disable port/notify — the port iSNMP trap is generated

■ blip — the broadcast and multiport is blocked for 5 seconds

■ blip port/notify — the broadcastraffic on the port is blocked foan SNMP trap is generated

If user defined appears as an optioAction field, an unrecognized actiofied using a MIB browser. You canoption.

e Switch Ports 4-15

Setting Up th

Falling Action none / event / enable / event + enable Use this field to specify the action for the alarm to take when it reaches the falling threshold:

■ none — no action takes place

■ event — an SNMP trap is generated

■ enable — the port is enabled

■ event + enable — the port is enabled and an SNMP trap is generated

If user defined appears as an option in the Falling Action field, an unrecognized action has been speci-fied using a MIB browser. You cannot select this option.

You should be aware of the following points when using Broadcast Storm Control:

■ The Switch takes 5–7 seconds to recognize that a broadcast storm is occurring.

■ Broadcast Storm Control calculates the average broadcast bandwidth over the previous 20-second interval. The average is based on four samples taken at 5-second intervals.

■ When the average value exceeds the rising threshold value, the rising action is triggered. The action is not triggered again until the aver-age broadcast bandwidth falls below the falling threshold level.


SettingTainfrhpthw

Ew

■

■

the SDB:

ntries in the data-in the database a period of time t transmitted. becoming full g that when a ork, its entry is

ing entries are e Switch is reset For more informa-e, refer to "Set-

ge 4-9.

geing time is set e database are his means that

till deleted if the cycle occurs. For

an ageing time, Unit" on page

ent entries do in the database if ff/on cycle occurs.

Up the Switch Database (SDB)he Desktop Switch maintains a database of device ddresses that it receives on its ports. It uses the formation in this database to decide whether a ame should be forwarded or filtered. The database olds up to a maximum of 104 entries (four entries er port); each entry consists of the MAC address of e device and an identifier for the port on which it as received.

ntries are added into the Switch Database in two ays:

The Desktop Switch can learn entries. That is, the unit updates the SDB with the source MAC address, and the port identifier on which the source MAC address is seen. Addresses are not learned on the backbone port. Learning is affected by security — refer to the description for the Security field on page 4-13.

The system administrator can enter and update entries using a MIB browser, an SNMP Network Manager or the Switch Database screen described in the following sections.

There are three types of entries in

■ Ageing entries — Initially, all ebase are ageing entries. Entries are removed (aged out) if, after(ageing time), the device has noThis prevents the database fromwith obsolete entries by ensurindevice is removed from the netwdeleted from the database. Agedeleted from the database if thor a power-off/on cycle occurs. tion about setting an ageing timting Up the Switch Unit" on pa

■ Non-ageing entries — If the ato 0:00, all ageing entries in thdefined as non-ageing entries. Tthey do not age, but they are sSwitch is reset or a power-off/onmore information about settingrefer to "Setting Up the Switch4-9.

■ Permanent entries — Permannot age, and they are retained the Switch is reset or a power-o

atabase (SDB) 4-17

The

s Yes if this entry is try is ageing or

te an entry in the the Switch Data-

s the database so that n.

sert an entry into the

a port which uses

u to delete entries

it is associated with a AN Mode.

Setting Up the Switch D

Database View

The Unit Database View screen, as shown in Figure 4-12, allows you to view and configure the Switch Database. To access this screen, display the Switch Management screen, choose the manage-ment level Unit, then select the SDB button.

The Unit Database View screen shows the following:

Database Entries This read-only field shows the number of entries currently in the SDB. The data-base holds a maximum of 104 addresses (four entries per port).

MAC Address If you highlight an entry in the list-box and press [Return], this field shows the MAC address for the entry.

Port Number If you highlight an entry in the list-box, this field shows the port identifier for the entry.

Permanent Yes / No This field allows you to specify that the current entry is permanent. Refer to the pre-vious section "Setting Up the Switch Database (SDB)" for a description of permanent and ageing entries.

You cannot specify that the current entry is perma-nent if the port uses AutoSelect VLAN Mode. For more information, refer to "Using AutoSelect VLAN Mode" on page 5-4.

A listbox containing three fields:

Port The port ID for the entry.

MAC Address The MAC address for the port currently stored in the database.

Figure 4-12 Unit Database View screen

Permanent Yes / No Showpermanent, or No if this ennon-ageing.

FIND This button lets you locadatabase. Refer to "Searchingbase" on page 4-18.

REFRESH This button refresheit displays the latest informatio

INSERT This button lets you indatabase.

You cannot insert an entry forAutoSelect VLAN Mode.

DELETE This button allows yofrom the database.

You cannot delete an entry if port which uses AutoSelect VL


Searchin

Yb

B

TM

1 Iny

2 SNli

B

Tti

1 Cfi

2 Iny

3 Sd

the MAC address

dentifier for this

ent or not by ent field.

ou want to delete C address into

t

ou want to make ype the MAC d.

.

g the Switch Database

ou can search the switch database in two ways: y MAC address or port number.

y MAC Address

o locate the port number against which a particular AC address is entered in the SDB:

the MAC Address field, type in the MAC address ou are trying to locate.

elect FIND. The port ID is displayed in the Port umber field and the entry in the listbox is high-ghted with an asterisk (*).

y Port

o locate the MAC addresses entered against a par-cular port ID in the SDB:

lear the MAC Address field by moving into the eld and pressing [Space].

the Port Number field, enter the port ID for which ou want MAC addresses displayed.

elect FIND. The listbox will show entries in the atabase for that port only.

Adding an Entry into the SDB

1 In the MAC Address field, type in of the device.

2 In the Port field, type in the port idevice.

3 Select whether the entry is permanspecifying Yes or No in the Perman

4 Select INSERT.

Deleting an Entry from the SDB

1 In the listbox, highlight the entry yand press [Return], or type the MAthe MAC Address field.

2 Select DELETE.

Specifying that an Entry is Permanen

1 In the listbox, highlight the entry ypermanent and press [Return], or taddress into the MAC Address fiel

2 In the Permanent field, specify Yes

3 Select INSERT.

Resilient Links 4-19

Set, you should note the

can be configured on

up if Spanning Tree tch.

et up on fiber or and standby links in use any combina-

be set up if:

same VLAN.

cal security setting.

s part of another

nfigured as a main f a resilient backbone is immediately config-fore it is enabled. A nfigured as a standby

LAN Trunk (VLT) port, be a VLT port.

defined at only one

t that is part of a resil-

Setting Up

ting Up Resilient LinksYou can configure a Switch to provide resilient links to another device so that network disruption is mini-mized if a link fails. A resilient link pair consists of a main link and a standby link. You define a resilient link pair by specifying the main port and standby port at one end of the pair.

Figure 4-13 Resilient link pair

Under normal network operating conditions, the main link carries your data. The Receive Idle signal of a fiber link or the Test Pulse on an Ethernet twisted pair link is continually monitored by the Switch. If a signal loss is detected, the Switch imme-diately enables the standby port so that it carries the data. In addition, the main port is disabled.

If a main link has a higher bandwidth than its standby link, traffic is automatically switched back to the main link provided no loss of link is detected for two minutes. Otherwise, you need to manually switch traffic back to the main link.

When setting up resilient linksfollowing:

■ Up to 13 resilient link pairs a Desktop Switch.

■ Resilient links cannot be set(STP) is enabled on the Swi

■ Resilient links can only be stwisted pair links. The mainthe same pair, however, cantion of these media.

■ A resilient link pair can only

■ The ports belong to the

■ The ports have an identi

■ Neither of the ports formresilient link pair.

■ A backbone port can be coport in a resilient link pair. Iport fails, the standby port ured as a backbone port bebackbone port cannot be coport.

■ If the main port is a Virtualthe standby port must also

■ A resilient link pair must beend of the connection.

■ You cannot disable any porient link pair.


Configu

Wcli

TFa

T

Mth

Ms

LTth

■

■

■

SsIDth

Ms

le / Not Present nection state of

g normally

k pair is disabled

resent in the cur-

box shows the ndby.

nknown / Not s the current pair:

is enabled and ain and standby

ring Resilient Links

ith the Switch Management screen displayed, hoose the port to be the main port in the resilient nk pair, then select the RESILIENCE button.

he Port Resilience screen is displayed as shown in igure 4-14. This screen allows you to set up, edit nd delete resilient link pairs.


ain Port ID This read-only field shows the ID of e main port.

edia Type Twisted Pair / Fiber This read-only field hows the media type connected to the main port.

ink State Available / Not Available / Not Present his read-only field shows the connection state of e main port:

Available — The port is operating normally

Not Available — The resilient link pair is disabled

Not Present — The port is not present in the cur-rent hardware

tandby Port ID This field shows the current tandby port ID and allows you to enter a new port . The standby port must be in the same VLAN as e main port.

edia Type Twisted Pair / Fiber This read-only field hows the standby port media type.

Figure 4-14 Port Resilience screen

Link State Available / Not AvailabThis read-only field shows the conthe standby port:

■ Available — The port is operatin

■ Not Available — The resilient lin

■ Not Present — The port is not prent hardware

Standby Links Available This listports that you can configure as sta

Pair State Active / Both Failed / UAvailable This read-only field showoperating state of the resilient link

■ Active — The resilient link pair operating normally with both mport capable of carrying traffic.


d as the standby port the unit.

ntical port security hey are members of

reen, select the port ort in the link. Select

foot of the screen.

he Standby Links ort ID in the Standby

bled field. Select

andby port.

up on the port, select of the screen. The d the Switch Man-

Setting Up

■ Both Failed — Although the resilient link pair is correctly configured, both links have failed. This could be due to loose connections or cable dam-age.

■ Unknown — The network configuration has changed and the resilient link pair no longer con-forms to the rules.

■ Not Available — The resilient link pair is disabled.

Active Port Main / Standby If a main link does not have a higher bandwidth than its standby link, traf-fic is not automatically switched back to the main link when it recovers. Use this field to manually switch traffic back to the main link.

Pair Enable Enabled / Disabled Use this field to enable or disable the resilient link pair. Before you disable the resilient link pair, you must remove cabling from the ports to avoid creating loops in your network configuration.

Creating a Resilient Link Pair

1 Ensure that the port nominateis not physically connected to

2 Ensure both ports have an idemode configuration and that tthe same VLAN.

3 At the Switch Management scto be configured as the main pthe RESILIENCE button at the

4 Select the standby port from tAvailable listbox or enter the pPort ID field.

5 Enable the pair in the Pair EnaAPPLY.

6 Connect the cabling for the st

Deleting a Resilient Link Pair

To delete the resilient link set the DELETE button at the footPort Resilience screen closes anagement screen is displayed.


Viewing

WcR

Tsreare

T

Mthie

Sore

PAs

■

■

■

■

Failed This in the resilient :

its normal state fic.

ailed and the fic. You should ible. If a main an the standby tched back pro- for 2 minutes. ck manually by he Port Resilience ) to Main.

resilient link pair o loose connec-

the Resilient Links Setup

ith the Switch Management screen displayed, hoose the management level Unit and select the ESILIENCE button.

he Unit Resilience Summary screen is displayed as hown in Figure 4-15. This screen shows the cur-nt resilient link configuration for the unit, and

llows you to access the Port Resilience screen for silient link pairs.

he following information is displayed:

AIN Port This read-only field displays the ID of e port configured as the main port for this resil-nt link pair.

TANDBY Port This read-only field displays the ID f the port configured as the standby port for this silient link pair.

air State Active / Both Failed / Unknown / Not vailable This read-only field displays the current tate of this resilient link pair:

Active — The resilient link pair is enabled and operating normally with both main and standby port capable of carrying traffic.

Both Failed — Although the resilient link pair is correctly configured, both links have failed. Check for any loose connections or cable damage.

Unknown — The network configuration has changed and the resilient link pair no longer con-forms to the rules.

Not Available — This resilient link pair is disabled.

Figure 4-15 Unit Resilience Summary screen

Active Port Main / Standby / Bothread-only field displays which portlink pair is currently carrying traffic

■ Main — The pair is operating inwith the main port carrying traf

■ Standby — The main port has fstandby port is carrying the trafrectify the fault as soon as possport has a higher bandwidth thport, traffic is automatically swivided no loss of link is detectedOtherwise, switch the traffic basetting the Active Port field in tscreen (described on page 4-20

■ Both Failed — Both ports of thehave failed. This could be due ttions or cable damage.


Setting Up

Pair Enable Enabled / Disabled This read-only field displays whether the resilient link pair is currently enabled or disabled. You enable or disable a resilient link pair using the Port Resilience screen described in "Configuring Resilient Links" on page 4-20.

OK This button allows you to access the Port Resil-ience screen for the current resilient link pair.


SettingTSad

Ytrtas

TTss

T

IPIPm

CcatiMletrctr

pecify a throttle rk Manager.

aced between ork Manager The unit of throt- The default f one tenth of a mission.

Up Trapsraps are messages sent across the network to an NMP Network Manager. They alert the network dministrator to faults or changes at the Switch evice.

our Network Manager may automatically set up aps in the Switch Trap Table. Check the documen-tion accompanying your network management

oftware.

o access the Trap Setup screen, select the SETUP RAPS button from the Switch Management Setup creen (described in Chapter 3). The Trap Setup creen is shown in Figure 4-16.


or IPX Address This field allows you to enter the or IPX address of the remote network manage-ent stations to which traps should be sent.

ommunity String This field allows you to enter ommunity strings for each remote Network Man-ger, allowing a very simple method of authentica-on between the Switch and the remote Network anager. The text string can be of 32 characters or ss. If you want a Network Manager to receive aps generated by the device, you must enter the ommunity string of the Network Manager into the ap table. The default community string is public.

Figure 4-16 Trap Setup screen

Throttle This field allows you to sdelay value for each remote NetwoThrottle delays are time periods plpackets to prevent a remote Netwreceiving too many traps at once. tle is one thousandth of a second.value is 100, which gives a delay osecond between each packet trans

e Console Port 4-25

Set

ed This field is only types. It determines if nection, and whether is removed. Refer to

documentation if you g.

NE / RTS-CTS ctional This field t flow control option efer to your terminal

ou are unsure of the

ed The Desktop line speed (baud rate) ith your VT100 termi-ecify whether

Setting Up th

ting Up the Console PortFrom the Desktop Switch Management Setup screen, described in Chapter 3, select the CONSOLE PORT button. The Console Port Setup screen is dis-played as shown in Figure 4-17.

If you change any of the console port parameters, you terminate any existing sessions using the con-sole port when you exit the screen. Ensure that the connected equipment’s console port parameters are set to match the new configuration. This allows you to continue to access the management facility from the equipment after you change the console port parameters.


Connection Type Local / Remote This field allows you to select the type of remote connection. Select Remote if you want to manage the Desktop Switch through a modem; DCD Control and DSR Control will be enabled. For all other cases, this field should be set to Local.

DCD Control Enabled / Disabled This field is only applicable to local connection types. It determines if DCD is required for a local connection, and whether the connection is closed if DCD is removed. Refer to your terminal or modem documentation if you are unsure of the correct setting.

Figure 4-17 Console Port Setup screen

DSR Control Enabled / Disablapplicable to local connection DSR is required for a local conthe connection is closed if DSRyour terminal or modem user are unsure of the correct settin

Flow Control XON/XOFF / NOUnidirectional / RTS-CTS Bidireallows you to select the correcfor your terminal or modem. Ror modem documentation if ycorrect setting.

Auto Config Enabled / DisablSwitch can auto-configure theof the console port to work wnal. This field allows you to spauto-configuration is enabled.


ST(bhs

Ctey

Pste

Sste

peed 1200 / 2400 / 4800 / 9600 / 19200 his field allows you to select the correct line speed aud rate) for your terminal or modem. If you ave enabled auto-configuration, the line speed is et automatically.

har Size 8 This read-only field displays the charac-r bit (data bit) size for the Switch. You should set

our terminal to the same value.

arity NONE This read-only field displays the parity etting for the Switch. You should configure your rminal to the same setting.

top Bit 1 This read-only field displays the stop bit etting for the Switch. You should configure your rminal to the same setting.

esktop Switch 4-27

Res

Resetting the D

etting the Desktop Switch

If you suspect a problem with the Desktop Switch, you can reset it.

1 From the Main Menu, select the RESET option.

The Reset screen is displayed, as shown in Figure 4-18.

2 Select OK.

Resetting the Switch in this way is similar to per-forming a power-off/on cycle. No setup information is lost.

CAUTION: Performing a reset may cause some of the data being transmitted at that moment to be lost.

Figure 4-18 Reset screen


InitializTdrefathiz

■

■

T

1 F

TF

2 S

CTauaa

Wth

■

ble to manage station communi-

rom both ends of the Switch. your manage-

T configuration

itialization is com-

ing the Desktop Switchhis screen allows you to perform a reset as escribed in the previous section, and in addition, turns non-volatile data stored on the unit to its ctory defaults (shown on page 1-12). Note that e IP address is not cleared. You should only initial-e the Switch if:

The configuration of the device no longer suits your network

Other efforts to solve problems have not suc-ceeded

o initialize the Switch:

rom the Main Menu, select the INITIALIZE option.

he Initialize screen appears as shown in igure 4-19.

elect OK.

AUTION: Use the Initialize option with great care. he Switch configuration is cleared from memory nd cannot be recovered. After initialization, all ser information is lost and only default users are vailable. All ports are set to their default values, nd are therefore enabled and available to all users.

hen initializing the Switch, take particular note of e following:

Network loops occur if you have set up resilient links. Before initializing the Switch, ensure you have disconnected the cabling for all your standby links.

Figure 4-19 Initialize screen

■ VLT ports fail and you are not athe Switch if your managementcates via the VLT. To avoid this:

a Remove the VLT configuration fthe VLT link before you initializeNote that the port furthest fromment station should have its VLremoved first.

b Reconfigure the VLT once the inplete.

ding Software 4-29

Upg

ect Switch (this is the

e name of the file ge to be down-

where it is accessible k with your system of where to place

ter the IP or IPX g the software image

MT LED flashes green n the download is

Upgra

rading SoftwareWhen 3Com issues a new version of the software image for the Switch, you can obtain it from 3Com’s information delivery systems, described in "Online Technical Services" on page F-1.

For upgrading the ATM OC-3c Module software, refer to the “SuperStack II Switch ATM OC-3c Module User Guide”.

You use the Software Upgrade screen to download new software images. The protocol used for down-loading software images is TFTP running over UDP/IP or IPX.

CAUTION: Before attempting to download, note:

■ The download only works over the network; it does not work through the console port.

■ The download does not work over a Virtual LAN Trunk (VLT) if you have a Boot software version lower than version 2.0.

■ The download does not work over an ATM link.

If a software download over IPX fails, enter the MAC or Ethernet address of your server into the Switch Database via the Unit Database View screen and then attempt the download again. Refer to "Searching the Switch Database" on page 4-18.

To upgrade Switch management software:

1 From the Main Menu, select SOFTWARE UPGRADE.

The Software Upgrade screen is displayed, as shown in Figure 4-20.

Figure 4-20 Software Upgrade screen

2 From the Destination field, seldefault).

3 In the File Name field, enter ththat contains the software imaloaded to the Desktop Switch.

You must place the image fileto the TFTP load request. Checadministrator if you are unsurethe image file.

4 In the Server Address field, enaddress of the server containinto be loaded.

5 Select OK.

During the download, the MGand the screen is locked. Whecomplete, the Switch is reset.


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dind osehd w

ur network according

example, you can rketing department, artment, and

nt department.

r example, you can s, another for manag-l staff.

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vement of devices on

t traffic

5

Virtual LANs Setting upthe Desktsuming nenetwork o

The followcept of VLmented o

What are VLAN

A VLAN istopology-if they arethat LAN ware whicare defineusing soft

ADVANCED MANAGEMENT

LANs)irtual Local Area Networks (VLANs) on Switch provides you with less time-con-ork administration and more efficient

eration.

g sections explain more about the con-Ns and explain how they can be imple-the Desktop Switch.

efined as a group of location- and ependent devices that communicate as n the same physical LAN. This means gments are not restricted by the hard- physically connects them; the segments by flexible user groups that you create are.

With VLANs, you can define yoto:

■ Departmental groups — Forhave one VLAN for the Maanother for the Finance depanother for the Developme

■ Hierarchical groups — Fohave one VLAN for directorers, and another for genera

■ Usage groups — For examone VLAN for users of e-mafor users of multimedia.

Benefits of VLANs

Implementing VLANs on your main advantages:

■ It eases the change and moIP networks

■ It helps to control broadcas

■ It provides extra security

5-2 CHAPTER 5: ADVANCED MANAGEMENT

H

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ured with three artments that hip of VLAN 1 is of Switch A;

d to ports 4, 5, N 3 spans both d 8 of Switch A

se VLANs can be ysical LAN seg- their physical

witch are shown

ow VLANS Ease Change and Movement

ith traditional IP networks, network administra-rs spend much of their time dealing with moves

nd changes. If users move to a different IP subnet, e IP addresses of each endstation must be

pdated manually.

ith a VLAN setup, if an endstation in VLAN 1 is oved to a port in another part of the network,

ou only need to specify that the new port is in LAN 1. This is something that can be done auto-atically if you have 3Com’s Transcend Enterprise anager for Windows (v6.0 and above).

ow VLANs Control Broadcast Traffic

ith traditional networks, congestion can be caused y broadcast traffic which is directed to all network evices whether they require it or not. VLANs crease the efficiency of your network because ach VLAN can be set up to contain only those evices which need to communicate with each ther.

ow VLANs Provide Extra Security

evices within each VLAN can only communicate ith devices in the same VLAN. If a device in VLAN needs to communicate with devices in VLAN 2, e traffic must cross a router.

An Example

Figure 5-1 shows a network configVLANs — one for each of the depaccess the network. The membersrestricted to ports 1, 2, 3, 4, and 5membership of VLAN 2 is restricte6, 7, and 8 of Switch B while VLASwitches containing ports 6, 7, anand 1, 2, and 3 of Switch B.

In this simple example, each of theseen as a broadcast domain — phments that are not constrained bylocation.

Specific configurations using the Slater in this chapter.

Figure 5-1 The concept of VLANs

LANs (VLANs) 5-3

VLA ter

to talk to devices in a uires a connection to een VLANs can only cted to the router. A er is an isolated each VLAN connected

Between Switch

ANs on the Desktop n another Switch er VLAN. Alterna-

link for all the VLANs k (VLT). A VLT is a rries traffic for all the up a VLT, you config-e link.

between SuperStack nd Desktop Switch Switch–router links.

e VLAN is a VLT port, he VLANs on the VLT function on that ic for the Default

Virtual

Ns and the Switch

The Desktop Switch supports VLANs which consist of a set of switch ports. Each switch port can only belong to one VLAN at a time, regardless of the device to which it is attached.

Each Desktop Switch can support up to 16 VLANs. However, you can have more than 16 VLANs in your entire network by connecting the 16 Switch VLANs to other VLANs using a router.

The Default VLAN and Moving Ports From the Default VLAN

On each Switch, VLAN 1 is the Default VLAN of the Switch; it has two properties:

■ It contains all the ports on a new or initialized Switch

■ It is the only VLAN which allows an SNMP Net-work Manager to access the management agent of the unit

By default, if a device is attached to a port in the Default VLAN and you want to move the device into another VLAN, you need to use the VLAN Setup screen to place the port in that VLAN. For more information about the VLAN Setup screen, refer to "Setting Up VLANs on the Switch" on page 5-8.

Connecting VLANs to a Rou

If the devices in a VLAN need different VLAN, each VLAN reqa router. Communication betwtake place if they are all conneVLAN not connected to a routVLAN. You need one port for to the router.

Connecting Common VLANsUnits

If you want to connect the VLSwitch with the same VLANs ounit, you can set up one link ptively, you can set up a single by creating a Virtual LAN TrunSwitch-to-Switch link which caVLANs on each Switch. To set ure the port at each end of th

VLTs can only be used for linksII Switch 1000, Switch 3000 aunits. You cannot use VLTs for

If you specify that a port on onthat port carries traffic for all tSwitch. If you then disable theport, the port only carries traffVLAN (VLAN 1).


U

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Figure 5-2

2 IfSV

Figure 5-3

hip for the end-t port in the

tage over Port Server data- endstations to the VLAN allo-ically config-

ote the follow-

and community

backbone not use

stored against t cannot use

sing AutoSelect VLAN Mode

y default, all ports on the Switch use Port VLAN ode — where each switch port is manually

laced in the required VLAN. The Switch allows ome ports to use another mode, AutoSelect VLAN ode. In this mode, the ports are automatically

laced in the required VLAN by referring to a VLAN erver database in 3Com’s Transcend Enterprise anager v6.0 for Windows.

utoSelect VLAN Mode works as follows:

hen an endstation is connected to a Switch or oves from one port to another, the Switch learns e MAC address of the endstation.

Switch learns the endstation’s MAC address

the relevant port uses AutoSelect VLAN Mode, the witch refers to the VLAN Server to determine the LAN membership of the endstation.

Switch refers to the VLAN Server

3 Having obtained the VLAN membersstation, the Switch places the relevanspecified VLAN.

Figure 5-4 Switch places the port in the VLAN

AutoSelect VLAN Mode has an advanVLAN Mode because once the VLANbase is set up correctly, you can moveother ports or other Switch units andcation of each endstation is automatured.

If you use AutoSelect VLAN Mode, ning:

■ You need to specify an IP address string for the VLAN Server.

■ You cannot use VLAN 15.

■ If a port has been configured as aport or as a VLT port, the port canAutoSelect VLAN Mode.

■ If a port has a permanent addressit in the Switch Database, the porAutoSelect VLAN Mode.

LANs (VLANs) 5-5

ations more easily if erprise Manager appli-t tasks.

5-5 illustrates a h a single Desktop d between two to VLAN 2 using the N and the router.

N Server database to:

in VLAN 1.

in VLAN 2.

he router.

he router.

le Desktop Switch unit

Virtual

For information about how to set up VLANs using AutoSelect VLAN Mode, refer to "Setting Up VLANs Using AutoSelect VLAN Mode" on page 5-11.

For more information about the VLAN Server data-base, refer to the documentation supplied with Transcend Enterprise Manager.

Using Non-routable Protocols

If you are running non-routable protocols on your network (for example, DEC LAT or NET BIOS), devices within one VLAN are not able to communi-cate with devices in a different VLAN.

Using Unique MAC Addresses

If you connect a server with multiple network adapt-ers to the Switch, we recommend that you config-ure each network adapter with a unique MAC address.

Extending VLANs into an ATM Network

If the Switch has an ATM OC-3c Module installed, you can extend the VLANs you have defined in your existing network into an ATM network. For more information, refer to the “SuperStack II Switch ATM OC-3c Module User Guide”.

VLAN Configurations

You can set up these configuryou use 3Com’s Transcend Entcations for all the managemen

Example 1

The example shown in Figuresimple VLAN configuration witSwitch whose ports are divideVLANs. VLAN 1 is able to talk connection between each VLA

To set up this configuration:

1 Use the VT100 screens or VLA

a Place ports 1–6 and 13–18

b Place ports 7–12 and 19–24

2 Connect a port in VLAN 1 to t

3 Connect a port in VLAN 2 to t

Figure 5-5 VLAN configuration with a sing


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1 U

a

b

2 C

3 C

4 U

a

b

5 Cth

6 USb

7 USp

p Switch units

er Switch to the

er Switch to the

xample 2

he example shown in Figure 5-6 illustrates two LANs spanning two Desktop Switch units. VLAN 1 able to talk to VLAN 2 using the connection etween each VLAN and the router. Ports within the ame VLAN but on different Switches communicate sing the VLT.

o set up this configuration:

se the VT100 screens or VLAN Server database to:

Place ports 1–6 and 13–18 of both Switch units in VLAN 1.

Place ports 7–12 and 19–24 of both Switch units in VLAN 2.

onnect port 26 of the higher Switch to Server 1.

onnect port 26 of the lower Switch to Server 2.

se the VT100 screens or VLAN Server database to:

Place port 26 of the higher Switch in VLAN 2.

Place port 26 of the lower Switch in VLAN 1.

onnect a port on the higher Switch to a port in e lower Switch.

se the VT100 screens to specify that the witch-to-Switch port on the higher Switch is a ackbone port and a VLT port.

se the VT100 screens to specify that the witch-to-Switch port on the lower Switch is a VLT ort.

Figure 5-6 VLAN configuration with two Deskto

8 Connect a VLAN 1 port on the lowrouter.

9 Connect a VLAN 2 port on the lowrouter.

LANs (VLANs) 5-7

ment Switch 3000 FX

e Switch 3000 FX to

N Server database to FX port connected to , and the other is

Virtual

Example 3

The example shown in Figure 5-7 illustrates two VLANs spanning three Desktop Switch units and a basement Switch 3000 FX with a Plug-in Module. Each Desktop Switch connects into the basement Switch using a VLT. The attached router allows the two VLANs to communicate with each other.

To set up this configuration:

1 Use the VT100 screens or VLAN Server database to:

a Place ports 1–6 and 13–18 of all the Desktop Switch units in VLAN 1.

b Place ports 7–12 and 19–24 of all the Desktop Switch units in VLAN 2.

2 Connect a port on each Desktop Switch to a port in the Switch 3000 FX.

3 Use the VT100 screens to:

a Specify that each Desktop Switch port connected to the Switch 3000 FX is a backbone port.

b Specify that each Desktop Switch port connected to the Switch 3000 FX is a VLT port.

c Specify that each Switch 3000 FX port con-nected to a Desktop Switch is a VLT port.

4 Connect port 1 of the Switch 3000 FX to Server 1.

5 Connect port 2 of the Switch 3000 FX to Server 2.

6 Use the VT100 screens or VLAN Server database to:

a Place port 1 of the Switch 3000 FX in VLAN 1.

b Place port 2 of the Switch 3000 FX in VLAN 2.

Figure 5-7 VLAN configuration with a base

7 Connect two spare ports on ththe router.

8 Use the VT100 screens or VLAspecify that one Switch 3000 the router is placed in VLAN 1placed in VLAN 2.


Setting

T

■

■

■

T

1 FM

2 In

3 Cd

T

A

ne port for the N Membership

onnect each ur network. rt are not stored es with

by the Switch

andby port of a ort of the pair is re information "Setting Up Resil-

OC-3c Module efer to the C-3c Module User

Up VLANs on the Switch

he VLAN Setup screen allows you to:

Assign ports to VLANs, if those ports use Port VLAN Mode

Define a backbone port for each VLAN

View VLAN setup information for the Switch

o access the VLAN Setup screen:

rom the Main Menu, select SWITCH MANAGE-ENT. The Switch Management screen is displayed.

the Management Level field, choose VLAN.

hoose the SETUP button. The VLAN Setup screen is isplayed, as shown in Figure 5-8.


listbox containing three fields:

Port This field allows you to select the ID of the port that you want to set up.

Type VLT / Bp / Standby / ATM / AutoSelectThis field displays information about the setup of the port:

■ VLT — The port is a VLT port. A Virtual LAN Trunk (or VLT) is a Switch-to-Switch link which carries traffic for all the VLANs on each Switch. For more information about VLTs in general, refer to "VLANs and the Switch" on page 5-3. To specify that a port is part of a VLT, refer to "Setting Up the Switch Ports" on page 4-12.

Figure 5-8 VLAN Setup screen

■ Bp — The port is the backboVLAN(s) specified in the VLAfield.

A backbone port is used to cVLAN to the backbone of yoAddresses received on the poin the Switch Database. Framunknown addresses receivedare forwarded to the port.

■ Standby — The port is the stresilient link pair. The main pdisplayed in brackets. For moabout resilient links, refer to ient Links" on page 4-19.

■ ATM — The port is an ATM port. For more information, r“SuperStack II Switch ATM OGuide”.

LANs (VLANs) 5-9

bone port. By default, VLAN (VLAN 1); ed Switch unit can

-3c Module port is a es a backbone port

is active. It cannot be N and a standard

a Switch with no Module automatically r the Default VLAN e the Switch. If a , but you fit a Trans-he backbone port for ower-up or initialize

changes to the VLAN

an ATM OC-3c s you access the

tending your VLANs re information, refer TM OC-3c Module

Virtual

■ AutoSelect — The port uses AutoSelect VLAN Mode. For more information about AutoSe-lect VLAN Mode, refer to "Using AutoSelect VLAN Mode" on page 5-4. For information about how to configure VLANs using AutoSe-lect VLAN Mode, refer to "Setting Up VLANs Using AutoSelect VLAN Mode" on page 5-11.

VLAN Membership This field displays the ID of the VLAN(s) to which the port belongs.

Port ID 1 / 2 / 3 ... 24 / 25 / 26 This field displays the ID of the port currently selected in the listbox.

VLAN ID 1 / 2 / 3 ... 16 If the port specified in the Port ID field uses Port VLAN Mode, this field allows you to enter the ID of the VLAN to which the port is to be assigned. If the port uses AutoSelect VLAN Mode, you cannot specify the VLAN ID. By default, all ports use Port VLAN Mode and belong to the Default VLAN (VLAN 1). This field is not displayed if the port is a VLT port.

If one or more ports use AutoSelect VLAN Mode, you cannot use VLAN 15. Also, if you are using the Spanning Tree Protocol, you cannot use VLAN 16. In these cases, the relevant VLANs are used internally by the Switch and are therefore not available.

Backbone Port Yes / No If the port specified in the Port ID field uses Port VLAN Mode, this field allows you to specify whether the port is a backbone port. If the port uses AutoSelect VLAN Mode, or is the standby port of a resilient link pair, you cannot spec-ify that it is a backbone port.

Each VLAN can have one backall ports belong to the Defaultbecause of this, an unconfiguronly have one backbone port.

If you specify that an ATM OCbackbone port, the port becomfor all the VLANs on which it the backbone port for one VLAport for another.

If you fit a Plug-in Module intospecified backbone ports, the becomes the backbone port fowhen you power-up or initializSwitch has no Plug-in Moduleceiver Module, this becomes tthe Default VLAN when you pthe Switch.

APPLY This button applies anydatabase.

ATM LEC Setup If the port isModule port, this button allowVLAN LEC Setup screen for exinto an ATM network. For moto the “SuperStack II Switch AUser Guide”.


AV

1 Inp

2 InV

3 S

CDththaM

S

1 Inp

2 InV

3 In

4 S

ort

, refer to “Set- 4-12.

oth ends of the

ssigning a Port to a VLAN When Using Port LAN Mode

the Port ID field, enter the ID of the required ort.

the VLAN ID field, enter the ID of the required LAN.

elect APPLY.

AUTION: Initially, all Switch ports belong to the efault VLAN (VLAN 1). This VLAN is the only one at allows an SNMP Network Manager to access e management agent of the unit. If you remove

ll ports from VLAN 1, then an SNMP Network anager cannot manage the Switch.

pecifying a Backbone Port

the Port ID field, enter the ID of the required ort.

the VLAN ID field, enter the ID of the required LAN.

the Select Port Type field, select Backbone Port.

elect APPLY.

Specifying that a Port is a VLT P

To specify that a port is a VLT portting Up the Switch Ports” on page

To create a VLT link, the ports at blink must be VLT ports.

LANs (VLANs) 5-11

Sett

allows you to specify , between the trans-uests to the Server.

d placing an excessive The default setting .

d shows the time uccessive polls of the the VLAN Server k for any changes.

Mode

s AutoSelect VLAN e Switch Unit" on

witch uses AutoSe-ting Up the Switch

Virtual

ing Up VLANs Using AutoSelect VLAN Mode

To set up VLANs using AutoSelect VLAN Mode, you need to:

■ Specify information about the VLAN Server

■ Specify that the Switch unit, or individual ports on the unit, use AutoSelect VLAN Mode

Specifying Information About the VLAN Server

The VLAN Server screen allows you to specify infor-mation about the VLAN Server. To access the VLAN Server screen:

1 From the Main Menu, select SWITCH MANAGE-MENT. The Switch Management screen is displayed.

2 In the Management Level field, choose VLAN.

3 Choose the SERVER button. The VLAN Server screen is displayed, as shown in Figure 5-9.


VLAN Server IP Address Enter the IP address of your VLAN Server in this field.

Backup VLAN Server IP Address This field allows you to enter the IP address of a backup VLAN Server. A backup VLAN Server can be used to supply VLAN allocations when the Switch cannot access the main VLAN Server.

VLAN Server Community String This field allows you to enter a community string for the VLAN Server(s). The default community string is public.

Figure 5-9 VLAN Server screen

Throttle 0 ... 99999 This fieldthe time delay, in millisecondsmission of VLAN allocation reqThe time delay is used to avoiworkload on the VLAN Server.for this field is 50 milliseconds

Poll Period This read-only fielinterval, in seconds, between sVLAN Server. The Switch polls once every poll period to chec

Specifying AutoSelect VLAN

To specify that the Switch useMode, refer to "Setting Up thpage 4-9.

To specify that a port on the Slect VLAN Mode, refer to "SetPorts" on page 4-12.


SpannUoa

Tth

SThS

What is

SdSd

Sep

■

■

a network con-ted by three

ach segment can g two paths. This cause the net-lows you to have ts duplicate paths s, one of them

abling STP on the TP system has ent 2 to LAN

Bridges C and A.

s shown in igures the net-2 flows through

ing Tree Protocolsing the Spanning Tree Protocol (STP) functionality f your Switch makes your network more fault toler-nt.

he following sections explain more about STP and e STP features supported by the Switch.

TP is not currently supported over an Asynchronous ransfer Mode (ATM) network. Therefore, if you ave an ATM OC-3c Module installed in your witch, it does not join the STP system.

STP?

TP is a part of the 802.1d bridge specification efined by the IEEE Computer Society. To explain TP more effectively, the Desktop Switch will be efined as a bridge.

TP is a bridge-based system for providing fault tol-rance on networks. STP allows you to implement arallel paths for network traffic, and ensure that:

Redundant paths are disabled when the main paths are operational

Redundant paths are enabled if the main paths fail

As an example, Figure 5-10 showstaining three LAN segments separabridges. With this configuration, ecommunicate with the others usinconfiguration creates loops which work to overload; however, STP althis configuration because it detecand immediately prevents, or blockfrom forwarding traffic.

Figure 5-11 shows the result of enbridges in the configuration. The Sdecided that traffic from LAN segmsegment 1 can only flow through

If the link through Bridge C fails, aFigure 5-12, the STP system reconfwork so that traffic from segment Bridge B.

Tree Protocol 5-13

Figur

Figur

B

Spanning

e 5-10 A network configuration that creates loops

e 5-11 Traffic flowing through Bridges C and A

Figure 5-12 Traffic flowing through Bridge


How ST

S

Init

■

■

Tthtip

Trebpre

S

Oth

1 EPoTth

path cost of the ath costs across t Bridge. osts for the Desk-

rk have deter-orts, each bridge Root Port and the ge Ports for each are blocked, ted from forward-

uch as a segment figures the net-he topology of idge to detect

p.

Cost

5

12

24

25

150

300

650

700

P Works

TP Initialization

itially, the STP system requires the following before can configure the network:

Communication between all the bridges. This communication is carried out using Bridge Proto-col Data Units (BPDUs), which are transmitted in packets with a known multicast address.

One bridge to start as a master or Root Bridge, a central point from which the network is config-ured.

he Root Bridge is selected on the basis of it having e lowest Bridge Identifier value. This is a combina-

on of the unique MAC address of the bridge and a riority component defined for the bridge.

he Root Bridge generates BPDUs on all ports at a gular interval known as the Hello Time. All other ridges in the network have a Root Port. This is the ort nearest to the Root Bridge, and it is used for ceiving the BPDUs initiated by the Root Bridge.

TP Stabilization

nce the network has stabilized, two rules apply to e network:

ach network segment has one Designated Bridge ort. All traffic destined to pass in the direction of r through the Root Bridge flows through this port. he Designated Bridge Port is the port which has e lowest Root Path Cost for the segment.

The Root Path Cost consists of theRoot Port of the bridge, plus the pall the Root Ports back to the RooTable 5-1 shows the default path ctop Switch.

2 After all the bridges on the netwomined the configuration of their ponly forwards traffic between the ports that are the Designated Bridnetwork segment. All other ports which means that they are prevening traffic.

STP Reconfiguration

In the event of a network failure, sgoing down, the STP system reconwork to cater for the changes. If tyour network changes, the first brthe change sends out an SNMP tra

Table 5-1 Default path costs

Port Type Duplex

100BASE-TX / 100BASE-FX (VLT) Full

Half

10BASE-T (VLT) Full

Half

100BASE-TX / 100BASE-FX Full

Half

10BASE-T Full

Half

Tree Protocol 5-15
Spanning
An Example

Figure 5-13 illustrates part of a network. All bridges have a path cost value assigned to each port, identi-fied by PC=xxx (where xxx is the value).

Bridge A is selected by STP as the Root Bridge, because it has the lowest Bridge Identifier. The Des-ignated Bridge Port for LAN A is port 1 on Bridge A. Each of the other four bridges have a Root Port (the port closest to the Root Bridge). Bridge X and Bridge B can offer the same path cost to LAN B. In this case Bridge B's port is chosen as the Designated Bridge Port, because it has the lowest Bridge Identi-fier. Bridge C's port is chosen as the Designated Bridge Port for LAN C because it offers the lowest Root Path Cost (the route through Bridge C and B costs 200, the route through Bridge Y and B would cost 300). You can set the path cost of a bridge port to influence the configuration of a network with a duplicate path.

Once the network topology is stable, all the bridges listen for special Hello BPDUs transmitted from the Root Bridge at regular intervals. If the STP Max Age time of a bridge expires (refer to “Configuring the STP Parameters of VLANs” on page 5-18) before receiving a Hello BPDU, the bridge assumes that the Root Bridge, or a link between itself and the Root Bridge, has gone down. The bridge then ini-tiates a reconfiguration of the network topology.

You can adjust timers to determine how quickly a network reconfigures and therefore how rapidly it recovers from a path failure (refer to “Configuring the STP Parameters of VLANs” on page 5-18).

Figure 5-13 Port costs in a network


STP Con

Fu

■

■

figurations

igure 5-14 shows two possible STP configurations sing SuperStack II Switch units:

Configuration 1 — Redundancy for Back-bone Link

In this configuration, a Desktop Switch and Switch 3000 TX both have STP enabled and are connected by two Fast Ethernet links. STP discov-ers a duplicate path and disables one of the links. If the enabled link breaks, the disabled link becomes re-enabled, therefore maintaining con-nectivity.

Configuration 2 — Redundancy through Meshed Backbone

In this configuration, four Switch 3000 TX units are connected such that there are multiple paths between them. STP discovers the duplicate paths and disables two of the links. If an enabled link breaks, one of the disabled links becomes re-enabled, therefore maintaining connectivity.

Figure 5-14 STP configurations

Tree Protocol 5-17

Ena

Spanning

bling STP on the Switch

To enable STP on your Switch:

1 From the VT100 Main Menu, select SWITCH MAN-AGEMENT. The Switch Management screen is dis-played.

2 In the Management Level field, choose Unit.

3 Choose the SETUP button. The Unit Setup screen is displayed, as shown in Figure 5-15.

4 In the Spanning Tree field, specify Enable.

5 Choose OK.

You cannot enable STP if you have set up resilient links on any of the Switch ports, or if you are using VLAN 16.

CAUTION: If STP is enabled on your Desktop Switch, we recommend that you do not use STP for connec-tions to other Desktop Switch units, Switch 1000 units, or repeaters. If you use STP for these connec-tions, link losses may occur on your network.

Figure 5-15 Unit Setup screen


Configu

Ctee

C

Teit

TmS

1 FM

2 In

3 Cp

T

Vs

YuVua

field shows the ges that have

ield shows the aits before trying

Switch has not pecified in this network topol-

ield shows the Root Bridge.

field shows the e transmission of

ws the path cost e.

ring STP on the Switch

AUTION: You should not configure any STP parame-rs unless you have considerable knowledge and

xperience with STP.

onfiguring the STP Parameters of VLANs

he Switch has a completely separate STP system for ach VLAN that you have specified. Each VLAN has s own Root Bridge, Root Ports and BPDUs.

he VLAN STP screen allows you to set up and anage an STP system for each VLAN on the

witch. To access the VLAN STP screen:


the Management Level field, choose VLAN.

hoose the STP button. The VLAN STP screen is dis-layed, as shown in Figure 5-16.

he VLAN STP screen shows the following:

LAN ID 1 / 2 / 3 ... 15 This field allows you to pecify the VLAN to be configured.

ou cannot use VLAN 16 with STP. Also, if you are sing AutoSelect VLAN Mode, you cannot use LAN 15. In these cases, the relevant VLANs are sed internally by the Switch and are therefore not vailable.

Figure 5-16 VLAN STP screen

Topology Changes This read-onlynumber of network topology chanoccurred in the current VLAN.

Max Age 6 ... 40 This read-only ftime (in seconds) that the Switch wto re-configure the network. If thereceived a BPDU within the time sfield, it will try to re-configure theogy.

Designated Root This read-only fBridge Identifier of the designated

Hello Time 1 ... 10 This read-onlytime delay (in seconds) between thBPDUs from the Switch.

Root Cost This read-only field shofrom the Switch to the Root Bridg

Tree Protocol 5-19

, or equal to, han, or equal to,

is field allows you to nds) between the e Switch when it is etting for this field is

0 This field allows onds) that the ports tening and learning Root Bridge. The For more information onfiguring the STP 5-20.

changes to the STP

Spanning

Forward Delay 4 ... 30 This read-only field shows the time (in seconds) that the ports on the Switch spend in the listening and learning states. For more information about these states, refer to “Configur-ing the STP Parameters of Ports” on page 5-20.

Root Port This read-only field shows the Root Port of the Switch.

Hold Time This read-only field shows the shortest time interval (in seconds) allowed between the transmission of BPDUs.

Time Since Topology Change This read-only field shows the time interval since the last topology change was detected.

Bridge Priority 0 ... 65535 This field allows you to specify the priority of the Switch. By changing the priority of the Switch, you can make it more or less likely to become the Root Bridge. The lower the number, the more likely it is that the bridge will be the Root Bridge. The default setting for this field is 65535.

Do not change the priority of the Switch unless absolutely necessary.

Bridge Max Age 6 ... 40 This field allows you to specify the time (in seconds) that the Switch waits before trying to re-configure the network when it is the Root Bridge. If the Switch has not received a BPDU within the time specified in this field, it will try to re-configure the STP topology. The default set-ting for this field is 20 seconds.

The time must be greater than2 x (Hello Time + 1), and less t2 x (Forward Delay – 1).

Bridge Hello Time 1 ... 10 Thspecify the time delay (in secotransmission of BPDUs from ththe Root Bridge. The default s2 seconds.

Bridge Forward Delay 4 ... 3you to specify the time (in secon the Switch spend in the lisstates when the Switch is the default setting is 15 seconds. about these states, refer to “CParameters of Ports” on page

APPLY This button applies anysystem.


C

TmS

1 FM

2 In

3 Cp

T

Ps

SFs

■

■

■

is preparing to rarily blocked to ning state, the ll error-free pack-calculations, and ived and pro-

te can forward ived and pro-

eld shows the ID the current port’s

ield shows the .

onfiguring the STP Parameters of Ports

he Port STP screen allows you to set up and anage the STP parameters of each port on the

witch. To access the Port STP screen:


the Management Level field, choose Port.

hoose the STP button. The Port STP screen is dis-layed, as shown in Figure 5-17.


ort ID 1 / 2 / 3 ... 24 / 25 / 26 This read-only field hows the ID of the port to be configured.

TP State Disabled / Listening / Blocking / Learning/orwarding This read-only field shows the current tate of the port:

Disabled — A port in this state does not forward packets, and does not participate in STP opera-tion.

Listening — A port in this state is preparing to forward packets, but has temporarily blocked to prevent a loop. During the Listening state, BPDUs are transmitted, received and processed.

Blocking — A port in this state does not forward packets to prevent more than one active path existing on the network. The port is included in STP calculations, and BPDUs can be transmitted, received and processed.

Figure 5-17 Port STP screen

■ Learning — A port in this stateforward packets, but has tempoprevent a loop. During the LearSwitch learns the addresses of aets. The port is included in STP BPDUs can be transmitted, rececessed.

■ Forwarding — A port in this stapackets. BPDUs can also be rececessed.

Designated Port This read-only fiof the Designated Bridge Port for segment.

Designated Root This read-only fBridge Identifier of the Root Bridge

Tree Protocol 5-21

is field allows you to directly to the For-s connected to it. Set is directly connected setting for this field is

art field to Enable multiple endstations, rk.

Spanning

Designated Cost This read-only field shows the path cost from the Root Bridge to the Designated Bridge Port for the current port’s segment.

Designated Bridge This read-only field shows the Bridge Identifier of the Designated Bridge for the current port’s segment.

Fwd Transitions This read-only field shows the number of times that the current port has transi-tioned from the Learning state to the Forwarding state.

Port Enable Enable / Disable This field allows you to enable or disable the current port.

Priority 0 ... 255 This field allows you to specify the priority of the port. By changing the priority of the port, you can make it more or less likely to become the Root Port. The lower the number, the more likely it is that the port will be the Root Port. The default setting for this field is 128.

Path Cost 0 ... 65535 This field allows you to spec-ify the path cost of the port.

The Switch automatically assigns the default path costs shown in Table 5-1 on page 5-14. If you spec-ify a new path cost in this field, this automatic system is disabled, and you can only re-enable it by initializing the Switch.

Fast Start Enable / Disable Thspecify whether the port goeswarding state when a device ithis field to Enable if the port to an endstation. The default Enable.

CAUTION: If you set the Fast Stwhen the port is connected toloops may occur in your netwo


RMONUyimn

TRb

Yifs3

What is

RMsare

A

■

n — communi-d collects the sta-does not have to probe and can r out-of-band

ernet RMON sta- groups, and

and error statis-casts, multicasts LAN.

up is used to patterns in critical

al views of net-dic samples of tics group. The e intervals and mization of trend

traffic patterns LAN, and to ating normal

sing the RMON (Remote Monitoring) capabilities of our Switch allows network administrators to

prove their efficiency and reduce the load on their etwork.

he following sections explain more about the MON concept and the RMON features supported y the Switch.

ou can only use the RMON features of the Switch you have an RMON management application, uch as the RMON application supplied with Com’s Transcend Enterprise Manager.

RMON?

MON is the common abbreviation for the Remote onitoring MIB (Management Information Base), a

ystem defined by the IETF documents RFC 1271 nd RFC 1757, which allows you to monitor LANs motely.

typical RMON setup consists of two components:

The RMON probe — an intelligent, remotely-controlled device or software agent that continually collects statistics about a LAN segment or VLAN, and transfers the information to a management workstation on request or when a pre-defined threshold is crossed.

■ The management workstatiocates with the RMON probe antistics from it. The workstation be on the same network as themanage the probe by in-band oconnections.

About the RMON Groups

The IETF define nine groups of Ethtistics. This section describes thesedetails how they can be used.

Statistics

The Statistics group provides traffictics showing packets, bytes, broadand errors on a LAN segment or V

Information from the Statistics grodetect changes in traffic and error areas of your network.

History

The History group provides historicwork performance by taking periothe counters supplied by the Statisgroup features user-defined samplbucket counters for complete custoanalysis.

The group is useful for analysis of and trends on a LAN segment or Vestablish baseline information indicoperating parameters.

RMON 5-23

mount of traffic and s of devices on a LAN ir, the Matrix group ber of packets,

ackets between the

you to examine net-o discover who is talk-PC is producing more ith its file server, for s Top N, this allows and their primary con-

chanism to instruct ackets that match a

to create capture be requested and workstation for

Alarms

The Alarms group provides a versatile, general mechanism for setting thresholds and sampling intervals to generate events on any RMON variable. Both rising and falling thresholds are supported, and thresholds can be on the absolute value of a vari-able or its delta value. In addition, alarm thresholds may be autocalibrated or set manually.

Alarms are used to inform you of a network perfor-mance problem and they can trigger automated action responses through the Events group.

Hosts

The Hosts group specifies a table of traffic and error statistics for each host on a LAN segment or VLAN. Statistics include packets sent and received, octets sent and received, as well as broadcasts, mul-ticasts, and error packets sent.

The group supplies a simple discovery mechanism listing all hosts that have transmitted. The next group, Hosts Top N, requires implementation of the Hosts group.

Hosts Top N

The Hosts Top N group extends the Hosts table by providing sorted host statistics, such as the top 20 nodes sending packets or an ordered list of all nodes according to the errors they sent over the last 24 hours.

Matrix

The Matrix group shows the anumber of errors between pairsegment or VLAN. For each pamaintains counters of the numnumber of octets, and error pnodes.

The conversation matrix helps work statistics in more detail ting to whom or if a particular errors when communicating wexample. Combined with Hostyou to view the busiest hosts versation partners.

Filter

The Filter group provides a methe RMON probe to capture pspecific criterion or condition.

Capture

The Capture group allows youbuffers on the probe that canuploaded to the managementdecoding and presentation.


E

Tctrovrectw

EraimEtrmo

Switch has three

cy

to remain at one tion from widely Ns. This means roblem site, set

ting information

agement

RMON probes lems occur. This before they obes record the at you can ana-

d

t involves a man-twork devices at tics and identify sizes and traffic s a strain on the lso generates

nomously looks management e characteristics

k. The probe ans that it only tation when the al state.

vents

he Events group provides you with the ability to reate entries in an event log and/or send SNMP aps to the management workstation. Events can riginate from a crossed threshold on any RMON ariable. In addition to the standard five traps quired by SNMP (link up, link down, warm start,

old start, and authentication failure), RMON adds o more: rising threshold and falling threshold.

ffective use of the Events group saves you time; ther than having to watch real-time graphs for portant occurrences, you can depend on the

vent group for notification. Through the SNMP aps, events can trigger other actions providing a echanism for an automated response to certain ccurrences.

Benefits of RMON

Using the RMON features of your main advantages:

■ RMON improves your efficien

Using RMON probes allows youworkstation and collect informadispersed LAN segments or VLAthat the time taken to reach a pup equipment, and begin collecis largely eliminated.

■ RMON allows proactive man

If they are configured correctly, deliver information before probmeans that you can take actionimpact on users. In addition, prbehavior of your network, so thlyze the causes of problems.

■ RMON reduces the traffic loa

Traditional network managemenagement workstation polling neregular intervals to gather statisproblems or trends. As networklevels grow, this approach placemanagement workstation and alarge amounts of traffic.

An RMON probe, however, autoat the network on behalf of theworkstation without affecting thand performance of the networreports by exception, which meinforms the management worksnetwork has entered an abnorm

RMON 5-25

RMO

pport provided by

witch

he Switch

ch has one Statistics ses-

ch has three History ses-X port, backbone port

20 historical samples



ms can be defined for tialized Switch has four port:

used

forwarded

kets

arms using an RMON , but you cannot create

out the alarms setup on out Alarm Actions" on Default Alarm Settings"

N and the Switch

RMON requires one probe per LAN segment, and stand-alone RMON probes have traditionally been expensive. Therefore, 3Com’s approach has been to build an inexpensive RMON probe into the Smart-Agent of each Switch. This allows RMON to be widely deployed around the network without cost-ing more than traditional network management.

A problem with stand-alone RMON probes is that they are passive; able to monitor and report, but nothing more. Placing probe functionality inside the network device allows integration of RMON with normal device management to allow proactive man-agement.

For example, statistics can be related to individual ports and the Switch can take autonomous actions such as disabling a port (temporarily or permanently) if errors on that port exceed a pre-defined thresh-old. Also, since a probe needs to be able to see all traffic, a stand-alone probe has to be attached to a non-secure port. Implementing RMON in the Switch means all ports can have security features enabled.

RMON Features of the Switch

Table 5-2 details the RMON suthe Switch.

Table 5-2 RMON support supplied by the S

RMON Group Support supplied by t

Statistics A new or initialized Switsion per port/VLAN.

History A new or initialized Switsions on the 100BASE-Tand Default VLAN:

■ 60-second intervals, 1stored

■ 30-second intervals, 1stored

■ 30-minute intervals, 9stored

Alarms Although up to 700 alarthe Switch, a new or inialarms defined for each

■ Bandwidth used

■ Broadcast bandwidth

■ Percentage of packets

■ Errors per 10,000 pac

You can modify these almanagement applicationor delete them.

For more information abthe Switch, refer to "Abpage 5-27 and "About on page 5-28.


f the Switch, you

eated, they have e or change

d a very large The Statistics every packet, but imum of 6000

N sessions, the gement resources warding perfor-cted.

Hosts

Hosts To

Matrix

Filter

Capture

Events

Table 5-2

RMON G

When using the RMON features oshould note the following:

■ After the default sessions are crno special status. You can deletthem as required.

■ The Desktop Switch can forwarvolume of packets per second. RMON group is able to monitorthe other groups sample a maxpackets a second.

■ The greater the number of RMOgreater the burden on the manaof the Switch; however, the formance of the Switch is not affe

Although Hosts is supported by the Switch, there are no Hosts sessions defined on a new or initialized Switch by default.

You can specify that a Hosts session is defined on the Default VLAN; for more information, refer to "Setting Up the Switch Unit" on page 4-9.

p N Although Hosts Top N is supported by the Switch, there are no Hosts Top N sessions defined on a new or initialized Switch.

Although Matrix is supported by the Switch, there are no Matrix sessions defined on a new or initialized Switch by default.

You can specify that a Matrix session is defined on the Default VLAN; for more information, refer to "Setting Up the Switch Unit" on page 4-9.

The Filter group is not presently supported by the Switch.

The Capture group is not presently supported by the Switch.

A new or initialized Switch has events defined for use with the default alarm system. Refer to "About Default Alarm Settings" on page 5-28 for more information.

RMON support supplied by the Switch

roup Support supplied by the Switch

RMON 5-27

Abo

Low Threshold

ast

.

Send Trap. Turn

port on.

lti-or

Turn port on.

ink

by.

ast all

on

Send Trap. Turn

ports back to origi-

nal state.

lti-or

off.

Turn ports back to

original state.

ut Alarm Actions

You can define up to 700 alarms for the Switch. The actions that you can define for each alarm are shown in Table 5-3.

Table 5-3 Alarm Actions

Action High Threshold

No action.

Notify only. Send Trap.

Notify and blip port.

Send Trap. Block broadcand multicast traffic on the port for 5 seconds.

Notify and disable port.

Send Trap. Turn port off

Notify and enable port.

Blip port. Block broadcast and mucast traffic on the port f5 seconds.

Disable port. Turn port off.

Enable port.

Notify and move resilient port.

Send Trap. If port is the main port of a resilient lpair then move to stand

Notify and blip device.

Send Trap. Block broadcand multicast traffic on ports for 5 seconds.

Notify and disable device.

Send trap. Turn all portsdevice off.

Notify and enable device.

Blip device. Block broadcast and mucast traffic on all ports f5 seconds.

Disable device. Turn all ports on device

Re-enable device.


About D

Afo

■

■

■

■

Ta

ll management f changes to any log can only be s level using an

rmation in the fol-

e number of are overwritten

Table 5-4

Statistic

Bandwidtused

Broadcastbandwidtused

Percentagof packetforwarded

Errors per10,000 packets

efault Alarm Settings

new or initialized Switch has four alarms defined r each port:

Bandwidth used

Broadcast bandwidth used

Percentage of packets forwarded

Errors per 10,000 packets

he default values and actions for each of these larms are given in Table 5-4.

About the Audit Log

The Switch keeps an audit log of auser sessions, providing a record oMIB including the RMON MIB. Theread by users at the security accesSNMP Network Manager.

Each entry in the log contains infolowing order:

■ Entry number

■ Timestamp

■ User ID

■ Item ID (including qualifier)

■ New value of item

There is a limit of 16 records on thchanges stored. The oldest recordsfirst.

Initial settings for the default alarms

High Threshold

Low Threshold Recovery

Samples per average

Period

h Value: 85%

No action

Value: 50%

No action

4 60 secs

h

Value: 20%

Notify and blip

Value: 10%

No action

4 20 secs

e s

Value: 85%

No action

Value: 50%

No action

4 60 secs

Value: 200

Notify

Value: 100

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4 60 secs

ter strrutet

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6

This chapoperatingplay any eto carry oanother n

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STATUS MONITORING AND STATISTICS

describes how to view the current atus of the Desktop Switch, how to dis-or information in a fault log and how a remote poll to check the response of work device.

ibes the Statistics screens for the Desk-and advises you on actions to take if xpected values for the statistics. Please er, that as all networks are different, any d are only recommendations.

tistics on a regular basis allows you to ll your network is performing. If you daily records, you will see trends emerg-ice problems arising before they cause rk faults. This way, statistics can also

t the best out of your network.

6-2 CHAPTER 6: STATUS MONITORING AND STATISTICS

SummaWcSd

TcSo4

TfiSthas

FRhfr

FFfrin

Foa

tal number of the destination (port) as the

the total number ort that are

ast address.

the total number nt port that are ast address.

r of errors which . Refer to the age 6-5.

his button to set o zero. Use this ee changes in e. This button device.

ry Statisticsith the Switch Management screen displayed,

hoose the management level Unit, then select the TATISTICS button. The Summary Statistics screen is isplayed, as shown in Figure 6-1.

he Summary Statistics screen lists values for the urrent counter against every port on the Desktop witch and it is refreshed approximately every 2 sec-nds. Once values have reached approximately ,000,000,000 they are reset to zero.

o view values for a particular counter, select the rst button displayed at the foot of the Summary tatistics screen. Pressing [Space] toggles through e available counters and as soon as you move

way from the button, the screen is refreshed to how values for that counter.

RAMES RECEIVED Displays values for the Frames eceived counter; the total number of frames that ave been received by the current port, including agments and frames with errors.

RAMES TRANSMITTED Displays values for the rame Transmitted counter; the total number of ames successfully transmitted by the current port, cluding fragments and frames with errors.

RAMES FORWARDED Displays the total number f frames that were received by the current port nd forwarded to other ports.

Figure 6-1 Summary Statistics screen

FRAMES FILTERED Displays the toframes that were filtered because station was on the same segment source station.

MULTI/BROADCAST (RX) Displaysof frames received by the current paddressed to a multicast or broadc

MULTI/BROADCAST (TX) Displaysof frames transmitted by the curreaddressed to a multicast or broadc

ERRORS Displays the total numbehave occurred on the current portdescription of the Errors field on p

CLEAR SCREEN COUNTERS Use tall counters shown on the screen tbutton for analysis if you wish to scounters over a short period of timdoes not clear the counters on the

Port Statistics 6-3

Por

ter provides a running he received frames as a percentage of . A sampling period

This counter provides dcast frame band-sed as a percentage ailable for the port. A is used.

vides a running aver-er 10,000 frames as a percentage.

or Errors on page 6-5.

is button to access

button to access

t StatisticsWith the Switch Management screen displayed, choose the management level Port, then select the STATISTICS button. The Port Statistics screen is dis-played, as shown in Figure 6-2. As well as showing statistics for the port, this screen allows you access to traffic and error counter screens.

If the port is an ATM OC-3c Module port, the ATM Port Statistics screen is displayed. For more informa-tion, refer to the “SuperStack II Switch ATM OC-3c Module User Guide”.

The Port Statistics screen shows the following:

Port ID The ID of the port you are currently manag-ing.

Bandwidth Used This counter provides a running average of the bandwidth used by the port, expressed as a percentage of the maximum band-width available for the port. A sampling period of 1 minute is used. The value gives an indication of the general traffic level of the network. A high utili-zation for single endstation segments is an indica-tion that your network is operating efficiently. However, if multiple endstations are connected to this port and you see values of around 40% you should reconsider the topology of your network because each user will see degraded network per-formance.

Figure 6-2 Port Statistics screen

Frames Forwarded This counaverage of the proportion of tthat are forwarded, expressed all frames received by the portof 1 minute is used.

Broadcast Frame Bandwidtha running average of the broawidth used by the port, expresof the maximum bandwidth avsampling period of 5 seconds

Error Frames This counter proage of the number of errors preceived by the port, expressedRefer to the field description f

TRAFFIC STATISTICS Select thtraffic counters for this port.

ERROR ANALYSIS Select this error counters for this port.


Port TrWTs

Tin

Pin

Frefr

Fhin

Othapcb

Otehcb

of frames suc-icast destination es directed to a

ed with errors.

r of frames tination address. errors.

l number of colli-ing from the unit. ernet operation pt to transmit at increase in the

a problem with a particularly if this in general net-

affic Statisticsith the Port Statistics screen displayed, select the

RAFFIC STATISTICS button. The Port Traffic Statistics creen is displayed, as shown in Figure 6-3.

he Port Traffic Statistics screen shows the follow-g:

ort ID The ID of the port you are currently manag-g.

rames Received The number of valid frames ceived by the port, including fragments and ames with errors.

rames Transmitted The number of frames that ave been successfully transmitted by the port cluding fragments and frames with errors.

ctets Received The number of octets received by e port. The calculation includes the MAC header

nd Cyclical Redundancy Check (CRC), but excludes reamble/Start-of Frame-Delimiter (SFD). Octet ounters are accurate to the nearest 256 octet oundary.

ctets Transmitted The number of octets transmit-d by the port. The calculation includes the MAC eader and CRC, but excludes preamble/SFD. Octet ounters are accurate to the nearest 256 octet oundary.

Figure 6-3 Port Traffic Statistics screen

Multicasts Received The numbercessfully received that have a multaddress. This does not include frambroadcast address or frames receiv

Broadcasts Received The numbereceived that have a broadcast desThis does not include frames with

Collisions An estimate of the totasions that occurred when transmittCollisions are a normal part of Eththat occur when two devices attemthe same time. A sudden sustainednumber of collisions may indicate device or cabling on the network, is not accompanied by an increasework traffic.

raffic Statistics 6-5

your network may ncy of your network

elect this button to screen to zero. It is wish to see changes of time. This button the device or affect gement workstation.

Port T

Fragments The total number of packets received that were not an integral number of octets in length or that had a bad Frame Check Sequence (FCS), and were less than 64 octets in length (excluding fram-ing bits, but including FCS octets).

Frames Forwarded The total number of frames which were received by the port and forwarded to their destination address.

Frames Filtered The total number of frames that were filtered because the destination address was on the same segment (port) as the source station.

Errors The total number of errors which have occurred on this port. Errors can be one of the fol-lowing:

■ CRC Alignment Errors

■ Short Events

■ Long Frames

■ Late Events

■ Jabbers

The value shown should be a very small proportion of the total data traffic.

IFM Count The number of times Intelligent Flow Management (IFM) has had to operate to minimize packet loss.

Frame Size Analysis The number of frames of a specified length as a percentage of the total number of frames of between 64 and 1518 octets. This indi-cates the composition of frames in the network.

The frame size ranges are:

■ 64 octets

■ 65–127 octets

■ 128–255 octets

■ 256–511 octets

■ 512–1023 octets

■ 1024–1518 octets

The composition of frames onhelp you to analyze the efficielayer protocol.

CLEAR SCREEN COUNTERS Sset all counters shown on the useful for trend analysis if youin counters over a short perioddoes not clear the counters oncounters at the network mana


Port ErWEs

T

Pin

CoCobbmthoth

Ccdp

SfothefogCw

ented by one he valid packet out-of-window ernet LAN ed in the IEEE

ted as a collision.

mented by one se octet count is size but less than e frames that for Ethernet high number of should isolate the e the transceiver e protocols may

ets received that ing framing bits,

ror Analysisith the Port Statistics screen displayed, select the

RROR ANALYSIS button. The Port Error Analysis creen is displayed, as shown in Figure 6-4.

he Port Error Analysis screen shows the following:

ort ID The ID of the port you are currently manag-g.

RC Align Errors This counter is incremented by ne for each frame with a CRC (Cyclic Redundancy heck) error or an alignment error. A CRC error ccurs if a frame of valid length has an invalid CRC ut does not have a framing error. It is likely that a it has been corrupted in transmission. An align-ent error occurs if a frame has a CRC error and e frame does not have an integral number of

ctets. Alignment errors may be caused by a fault at e transmitting device.

heck cables and connections for damage. Try hanging the transceiver or adapter card of the evice connected to the port at the source of the roblem.

hort Events This counter is incremented by one r each carrier event whose duration is less than e short event maximum time. Short events are

rror frames smaller than the minimum size defined r Ethernet frames. They may indicate externally

enerated noise causing problems on the network. heck the cabling routing and re-route any cabling hich may be affected by external noise sources.

Figure 6-4 Port Error Analysis screen

Late Events This counter is incremeach time a collision occurs after tminimum time. A late event is an collision that may occur if your Ethexceeds the maximum size as definstandard. A late event is also coun

Long Frames This counter is increeach time a frame is received whogreater than the maximum frame Jabber frame size. Long Frames arexceed the maximum size defined frames (1518 octets). If you see a long frames on your network, you source of these frames and examinor adapter card at the device. Somgenerate these frames.

Jabbers The total number of packwere longer than 8K octets (excludbut including FCS octets).

Error Analysis 6-7
Port
CLEAR SCREEN COUNTERS Select this button to set all counters shown on the screen to zero. It is useful for trend analysis if you wish to see changes in counters over a short period of time. This button does not clear the counters on the device or affect counters at the network management workstation.


Status Tauy

Ttha

T

Sn

Nreize

LPcmin

Ho

he version ge stored in is automatically software.

e version number Desktop Switch.

isplay the Switch on.

Monitoringhe status screen provides read-only information bout the Desktop Switch. This information may be seful for your technical support representative if ou have a problem.

o access the screen, from the Main Menu, select e STATUS option. The Status screen is displayed,

s shown in Figure 6-5.

he Status screen shows the following:

ystem Up Time The time the unit has been run-ing since the last reset or power-off/on cycle.

umber Of Resets The total number of system sets since the Switch was first installed or initial-ed; either power on, manual reset or a watchdog xpiry.

ast Reset Type Other / Command / Watchdog / ower-reset / System-error This field indicates the ause of the last reset. It may be due to manage-ent command, watchdog timeout expiry, power terruption, a manual reset or a system error.

ardware Version The hardware version number f the Switch.

Figure 6-5 Status screen

Upgradable Software Version Tnumber of the agent software imaFlash EPROM. This version numberupdated when you download new

Boot Software Version This is thof the Boot software stored on the

FAULT LOG Select this button to dFault Log, described the next secti

Fault Log 6-9

Fau
lt LogThe Fault Log displays read-only information about the Switch which is updated whenever an abnor-mal condition is detected. This information is for internal 3Com use only. You may be asked to quote this information if reporting a fault to your supplier.
With the Status screen displayed, select the FAULT LOG button. The Fault Log is screen is displayed, as shown in Figure 6-6.

The Fault Log screen shows the following:

Reset Count The number of resets recorded at the time of the fault.

Time (seconds) The time elapsed since the last reset when the fault occurred.

Area This information may be used for fault diagno-sis by your technical support representative.

Fault Number The hexadecimal number in this field indicates the type of fault. You should note this number and contact your technical support repre-sentative for advice.

Figure 6-6 Fault Log screen


RemotTfrrenloa

T

1 FRF

2 Ina

3 S

Wfisanfi

e Pollinghe Remote Poll screen allows you to send a single ame to a remote device to see if that device is sponding. This can help to locate the source of a etwork problem. It is also particularly helpful in cating devices that support IP, IPX and ping but re not manageable by SNMP.

o poll a device:

rom the Main Menu, select Remote Poll. The emote Poll screen is displayed, as shown in igure 6-7.

the Target Address field, enter the IP or IPX ddress of the device you want to poll.

elect the POLL button at the foot of the screen.

hen the poll is complete, the Round Trip Time eld shows the interval in milliseconds between ending the frame to the target device and receiving response at the Switch. If the target device does ot respond after approximately 10 seconds, this eld displays no reply.

Figure 6-7 Remote Poll screen

reryts

op

fe

: Wws

d fo

tiot

llinI Hall

it

ct co

w w

is, the connector to wall plug, must have with an inlet.

-approved and CSA

n for the flexible cord

rated current capac-

st be an th a NEMA 5-15P 15P (15A, 250V) con-

mply with section t DK2-1a or DK2-5a.

mply with SEV/ASE

A

You mustbefore carcomponenthe Deskt

Important Sa

WARNINGmust folloinstruction

Please reaoughly be

■ Installaried ou

■ If instaStack Ibe inst

■ This un

■ Conneensure dards.

■ The pocountry

SAFETY INFORMATION

ad the following safety information ing out any installation or removal of , or any maintenance procedures on Switch.

ty Information

arnings contain directions that you for your personal safety. Follow all carefully.

the following safety information thor-re installing the Desktop Switch.

n and removal of the unit must be car-by qualified personnel only.

g the Switch unit in a stack with Super-ub units, the Desktop Switch unit must ed below the narrower Hub units.

must be earthed.

the unit to an earthed power supply to mpliance with European safety stan-

er cord set must be approved for the here it will be used.

■ The appliance coupler, thatthe device itself and not thea configuration for mating EN60320/IEC320 appliance

■ For U.S.A. and Canada:

■ The cord set must be ULcertified.

■ The minimum specificatiois:

■ No. 18 AWGType SV or SJ3-conductor

■ The cord set must have aity of at least 10A.

■ The attachment plug muearth-grounding type wi(15A, 125V) or NEMA 6-figuration.

■ For Denmark:

■ The supply plug must co107-2-D1, standard shee

■ For Switzerland:

■ The supply plug must co1011.

A-2 APPENDIX A: SAFETY INFORMATION

■

■

■

■

ad is discon-connector fuse the unit.

from IT (imped-ur supplies are of

be powered by transformer ratio ection point irectly to Earth

d by Oftel Gen-100003, for indi-

This can only be ort on the unit

ule or Transceiver power still con-

■ It is essential that the mains socket outlet is installed near to the unit and is accessible. You can only disconnect the unit by removing the appliance coupler from the unit.

If the power supply plug is unsuitable and you have to replace it, you may find other codings for the respective connections. Connect the power supply wires from the unit according to the fol-lowing scheme:

■ Brown wire to the Live (Line) plug terminal which may be marked with the letter L or col-ored red.

■ Blue wire to the Neutral plug terminal which may be marked with the letter N or colored black.

■ Yellow/green wire to the Earth (Ground) plug terminal which may be marked with the letter E, or the earth symbol, or colored green/yel-low.

This unit operates under SELV conditions (Safety Extra Low Voltage) according to IEC 950, the conditions of which are maintained only if the equipment to which it is connected is also opera-tional under SELV.

The unit should never be connected to an A.C. outlet (power supply) without an Earth (Ground) connection.

To comply with European safety standards, a spare fuse must not be fitted to the appliance inlet. Only fuses of the same manufacturer, make and type should be used with the unit.

■ Ensure that the power supply lenected before opening the IEC cover or removing the cover of

■ France and Peru only:

■ This unit cannot be poweredance à la terre) supplies. If yothe IT type, this unit should 230V (2P+T) via an isolation 1:1, with the secondary connlabelled Neutral, connected d(Ground).

■ U.K. only:

■ The Desktop Switch is covereeral Approval, NS/G/12345/J/rect connection to a public telecommunications system. achieved using the console pand an approved modem.

■ Do not remove the Plug-in ModModule blanking plate with thenected.

ty Information A-3

Pow

Sock

shielded RJ45 data as telephone sockets. ctors to these sockets.

ata cables with n be connected to

Important Safe

er Supply and Fuse

The unit automatically adjusts to the supply volt-age. The fuse is suitable for both 110V A.C. and 220–240V A.C. operation.

WARNING: Ensure that the power is disconnected before opening the fuse holder cover.

To change the fuse, release the fuse holder by gently levering a small screwdriver under the fuse holder catch. Only 5A Time Delay (anti-surge) fuses of the same type and manufacture as the original should be used.

ets for Redundant Power System (RPS)

Only connect a 3Com Redundant Power System to this socket. For details, follow the installation instructions in the manuals accompanying the Redundant Power System.

RJ45 Ports

WARNING: The RJ45 ports are sockets. They cannot be used Only connect RJ45 data conne

Either shielded or unshielded dshielded or unshielded jacks cathese data sockets.


L’inform

Adp

Vn

■

■

■

■

■

■

■

pour le cordon

ir une capacité s de 10A.

un type mis à la NEMA 5-15P (15A, 250V).

installé près de pouvez seulement la fiche d'alimen-

ditions SELV ormément à intenues seule-st branchée, est

chée à une prise rant) sous aucun

is à la terre (mis

sécurité ange ne doit pas reil. Seulement construit, et type .

e d'alimentation e couvercle de enlever le couver-

ation de Sécurité Importante

VERTISSEMENT: Les avertissements contiennent les irections que vous devez suivre pour votre sécurité ersonnelle. Suivez toutes les directives avec soin.

euillez lire à fond l'information de la sécurité suiva-te avant d'installer le Desktop Switch.

L'installation et l'enlèvement de l'unité doivent être faits seulement par le personnel qualifié.

Si vous entassez l'unité Switch avec les unités SuperStack II Hub, l'unité Desktop Switch doit être installée en dessous des unités Hub plus étroites.

Cette unité doit être mise à la terre.

Brancher l'unité à une source de courant mise à la terre pour assurer la conformité aux normes de sécurité européennes.

La cordon d'alimentation surmoulé doit être approuvé pour le pays auquel il sera utilisé.

Le socle de connecteur, c'est-à-dire, le connecteur à l'appareil lui-même et non pas la prise murale, doit avoir une configuration pour le branche-ment avec une admission d'appareil EN60320/IEC320.

Pour USA et le Canada:

■ Le cordon surmoulé doit être UL Certifié et CSA Certifié.

■ Les spécifications minimales souple sont:

No. 18 AWGType SV ou SJ3-conducteur

■ Le cordon surmoulé doit avode courant calculée au moin

■ La fiche de fixation doit être terre avec une configuration (15A, 125V) ou NEMA 6-15P

■ C'est essentiel que le socle soit l'unité et soit accessible. Vous débrancher l'unité en enlevant tation de la prise de courant.

■ Cette unité marche sous les con(Safety Extra Low Voltage) confIEC950, ces conditions sont mament si le matériel auquel elle eaussi en exploitation sous SELV.

■ L'unité ne devrait pas être brande courant C.A. (source de couprétexte sans un branchement mà la masse).

■ Pour conformer aux normes de européennes, un fusible de rechêtre ajusté à l'admission d'appales fusibles du même fabricant, doivent être utilisés avec l'unité

■ Assurer que l'entrée de la sourcsoit débranchée avant d'ouvrir lfusible du connecteur IEC ou d'cle de l'unité.

ité Importante A-5

La S

er le contenant du un petit tournevis sible. Seulement les

itoires du même type ent être utilisés.

ntation multiple de r les détails les direc-anuel qui accompa-

es prises de courant ls ne peuvent pas ourant télépho-s connecteurs RJ45

urant.

ou non blindés, avec s, l'un ou l'autre, rises de courant de

L’information de Sécur

■ Seulement Pour La France et Le Pérou:

■ Cette unité ne peut pas être mise en marche des sources de courant IT (Impédance à la terre). Si vos sources de courant sont de type IT, cette unité doit être alimentée par 230V (2P+T) via un rapport de transformation d'iso-lation de 1:1, avec un point de connexion sec-ondaire étiqueté Neutre, branché directement à la Terre (à la Masse).

■ Ne pas enlever le Plug-in Module ou la plaque d'occultation de module d'émetteur-récepteur avec la puissance encore branchée.

ource de Courant et Le Fusible

L'unité s'ajuste automatiquement à la tension d'ali-mentation. Le fusible est convenable aux deux opérations 110 V C.A. et 220–240 V C.A.

AVERTISSEMENT: Assurer que l'alimentation soit débranchée avant d'ouvrir le couvercle du contenant du fusible.

Pour changer le fusible, dégagfusible en mettant doucementsous l'arrêt de contenant du fufusibles de types 5A anti-transet fabricant que l'original doiv

Socle Pour Alimentation Multiple

Brancher seulement une alime3Com à cet socle. Suivre poutives de l'installation dans le mgne l'alimentation multiple.

Les Ports RJ45

AVERTISSEMENT: Ceux-ci sont lde données RJ45 protégées. Iêtre utilisés comme prises de cniques. Brancher seulement lede données à ces prises de co

Les câbles de données blindésles jacks blindés ou non blindépeuvent être branchés à ces pdonnées.


Wichti

Wdsu

BSg

■

■

■

■

■

■

ker sich in unmit-et und leicht erre-urch

teckers aus der nnt werden.

leinspannung tra Low Voltage) n können nur betrieben wer-

tänden an einen r anzuschließen

uropäischen sten, darf am eine den. Nur llung und Marke

Gerät verwenden.

appe der IEC r vorm Abneh- Gerät sicher-gskabel vom

Plug-in Module - t entfernen, angeschlossen ist.

ge Sicherheitsinformationen

ARNUNG: Warnungen enthalten Anweisungen, ie zur eigenen Sicherheit unbedingt zu beachten ind. Bitte befolgen Sie alle Anweisungen sorgfältig nd genau.

itte unbedingt vor dem Einbauen des Desktop witch Einheit die folgenden Sicherheitsanweisun-en durchlesen.

Ein- und Ausbau des Gerätes ist nur von Fachper-sonal vorzunehmen.

Wenn die Desktop Switch Einheit in einer Stapel mit anderen SuperStack II Hub Einheiten einge-baut werden soll, muß die Desktop Switch Einheit unter die schmaleren Hub Einheiten eingebaut werden.

Dieses Gerät muß geerdet sein.

Das Gerät an geerdete Stromversorgung anschließen, um eine Übereinstimmung mit den europäischen Sicherheitsbestimmungen zu gewährleisten.

Der Anschlußkabelsatz muß mit den Bestimmun-gen des Landes übereinstimmen, in dem er ver-wendet werden soll.

Die Anordnung der Gerätsteckvorrichtung, d.h. die Steckverbindung am Gerät selbst im Gegen-satz zum Wandstecker, muß in den EN60320/IEC320 Zuführungsstecker am Gerät passen.

■ Es ist wichtig, daß der Netzstectelbarer Nähe zum Gerät befindichbar ist. Das Gerät kann nur dHerausziehen des VerbindungssSteckdose vom Stromnetz getre

■ Das Gerät wird mit Sicherheits-Knach IEC 950 (SELV = Safety Exbetrieben. Angeschloßen werdeGeräte, die ebenfalls nach SELVden.

■ Das Gerät ist unter keinen UmsWechselstrom (A.C.) Netzsteckeohne Erdungsleitung.

■ Um Übereinstimmung mit den eSicherheitsnormen zu gewährleiZuführungstecker des Gerätes kErsatzsicherung angebracht werSicherungen der gleichen Herstesowie des gleichen Typs für das

■ Vorm Öffnen der AbdeckungsklSteckverbindungssicherung odemen der Gesamtabdeckung derstellen, daß das StromverbindunNetzstrom getrennt ist.

WARNUNG: Die Austastplatten der oder Sendeempfänger-Module nichsolange die Einheit ans Stromnetz

informationen A-7

Stro

Stec

sich um abgeschirmte als Telefonbuchsen tensteckverbinder an

tweder mit abge-en Datenkabeln mit hirmten Klinkensteck-

Wichtige Sicherheits

mversorgung und Sicherung

Das Gerät stellt sich automatisch auf die Versor-gungsspannung ein. Die Sicherung ist sowohl für 110V A.C. wie für 220–240V A.C. geeignet.

WARNUNG: Vor dem Öffnen der Sicherungshalterung das Gerät vom Netzstrom trennen.

Zum Auswechseln der Sicherung durch leichtes Heben mit einem kleinen Schraubenzieher die Abdeckungsklappe der Sicherungshalterung lösen. Sicherungen nur durch gleichen Typ und Wert wie die Originalsicherung ersetzen. Sicherung auswech-seln und die Klappe der Sicherungshalterung wieder schließen.

kdose für Redundant Power System (RPS)

Nur ein 3Com Redundant Power System an diese Steckdose anschließen. Für weitere Angaben die genauen Einbauanweisungen im Handbuch zum Redundant Power System befolgen.

Die Einheit ist unter keinen Umständen an einen Wechselstrom Netzstecker (A.C.) anzuschließen, wenn dieser keine Erdung hat.

RJ45 Anschlußen

WARNUNG: Hierbei handelt es RJ45 Datenbuchsen, die nicht verwendbar sind. Nur RJ45 Dadiese Buchsen anschließen.

Diese Datenstecker können enschirmten oder unabgeschirmtabgeschirmten oder unabgescern verbunden werden.


ineree

rid.

u

na

ics

nitor

nager

curity

nitor

nager

curity

nitor

nager

curity

nitor read-only

nager

curity

nitor

nager

curity

nitor

nager

curity

nitor

nager

curity

nitor

read-only

nager

curity

ailable to access level...

B

The followlevel of usSwitch scr

All accesswise state

Screen

Logon

Main Men

Switch Ma

Port STP

Port Statist

SCREEN ACCESS RIGHTS

g table lists the rights assigned to each for accessing and editing Desktop ns via the VT100 interface.

ghts are read-and-write unless other-

Available to access level...

Monitor

Manager

Security

Monitor

Manager

Security

gement Monitor

Manager

Security

Monitor read-only

Manager

Security

Monitor

Manager

Security

Port Traffic Statistics Mo

Ma

Se

Port Error Analysis Mo

Ma

Se

Port Resilience Mo

Ma

Se

Port Setup Mo

Ma

Se

Unit Statistics Mo

Ma

Se

Unit Database View Mo

Ma

Se

Unit Resilience Mo

Ma

Se

Unit Setup Mo

Ma

Se

Screen Av

B-2 APPENDIX B: SCREEN ACCESS RIGHTS

V

V

V

U

L

C

D

E

S

F

M

S

r read-only

r

read-only

r

r

r

le to access level...

LAN STP Monitor read-only

Manager

Security

LAN Server Monitor read-only

Manager

Security

LAN Setup Monitor read-only

Manager

Security

ser Access Levels Monitor

Manager

Security

ocal Security Security

reate User Security

elete Users Security

dit User Monitor

Manager

Security

tatus Monitor

Manager

Security

ault Log Monitor

Manager

Security

anagement Setup Monitor read-only

Manager

Security

creen Available to access level...

Trap Setup Monito

Manage

Security

Console Port Setup Monitor

Manage

Security

Software Upgrade Security

Initialize Security

Reset Manage

Security

Remote Poll Manage

Security

Screen Availab

innaiveota

D

t a

ure A

ri

asd

ri

ledstnsts

ED lights yellow:

ellow, the Module st; refer to the previ-dule’s agent software to the User Guide

ED flashes yellow:

You may need to itch’s management s the Module (refer to e 4-29), or remove plier for further

the Status LED does

amage

f the link are pow-

ver cable if you are ASE-TX port with a

C

The followwhen maof correctwhich is nplease contative.

LEDs

Power LE

Check thathe device

Check thethe fuse, Appendix

On powe

The unit hyou shoul

On powelow:

The instalOn Self TeModule, elem persis

TROUBLE-SHOOTING

g is a list of problems you may see ging the Switch with suggested courses action to take. If you have a problem

t listed here and you cannot solve it, ct your local technical support represen-

does not light:

the power cable is firmly connected to nd to the supply outlet.

nit fuse. For information on changing fer to "Power Supply and Fuse" in .

ng-up, the MGMT LED lights yellow:

failed its Power On Self Test (POST) and contact your supplier for advice.

ng-up, the MGMT LED flashes yel-

Plug-in Module has failed its Power (POST). Try re-installing the Plug-in uring it is properly seated. If the prob-

, contact your supplier for advice.

The Plug-in Module Status L

If the MGMT LED is flashing yhas failed its Power On Self Teous advice. Otherwise, the Mois not installed correctly. Refer supplied with the Module.

The Plug-in Module Status L

The Module is not recognized.download a version of the Swagent software that recognize"Upgrading Software" on pagthe Module. Contact your supadvice.

A link is connected and yet not light:

Check that:

■ All connections are secure

■ Fiber cables are free from d

■ The devices at both ends oered-up

■ The connection uses cross-olinking a 10BASE-T or 100Bdevice which is MDIX-only

C-2 APPENDIX C: TROUBLE-SHOOTING

Using

Tp

Cc

F[Ra

Ceti1

S

Cc

Ceti1

Cp

nnot access the

subnet mask and red, and that the the device's IP e SNMP Network entation for the

access the

net mask and red, and that the

you enter the IP en invoking the

NMP Network

nager's IP address configured.

r Telnet worksta-evice:

r Commu-

you are trying to abled, refer to page 4-12. If it is d network cabling

the VT100 Interface

he initial Main Banner screen does not dis-lay:

heck that your terminal or terminal emulator is orrectly configured to operate as a VT100 terminal.

or console port access, you may need to press eturn] several times before the Main Banner

ppears.

heck the settings on your terminal or terminal mulator. The management facility's auto configura-on works only with baud rates from 1200 to 9,200.

creens are incorrectly displayed:

heck that your terminal or terminal emulator is orrectly configured to operate as a VT100 terminal.

heck the settings on your terminal or terminal mulator. The management facility's autoconfigura-on works only with baud rates from 1200 to 9,200.

heck that you are using a suitable font (for exam-le, in HyperTerminal use the MS LineDraw font).

The SNMP Network Manager cadevice:

Check that the device's IP address,default router are correctly configudevice has been reset. Check that address is correctly recorded by thManager (refer to the user documNetwork Manager).

The Telnet workstation cannot device:

Check the device's IP address, subdefault router are correctly configudevice has been reset. Ensure thataddress of the Switch correctly whTelnet facility.

Traps are not received by the SManager:

Check that the SNMP Network Maand community string are correctly

The SNMP Network Manager otion can no longer access the d

Check that Remote Telnet access onity-SNMP access is enabled.

Check that the port through whichaccess the device has not been dis"Setting Up the Switch Ports" on enabled, check the connections anat the port.

ing the Switch C-3

and the Packet LED stant collisions ics" on page 6-4):

devices and have the CE enabled at both

cess must only be itch-device link. Dis-Switch port is witch Ports" on page

ch port so that it rm occurs, but the

:

rring such that the cannot drop below is means that the

ributes in the Broad-the Port Setup screen:

t/notify.

able.

"Setting Up the

Us

Check that the port through which you are trying to access the device is in VLAN 1 (the Default VLAN). Refer to "Setting Up VLANs on the Switch" on page 5-8.

Try accessing the device through a different port. If you can now access the device, a problem with the original port is indicated. Re-examine the connec-tions and cabling.

There may be a network problem preventing you accessing the device over the network. Try access-ing the device through the console port.

You forget your password and cannot log on:

If you are not one of the default users (monitor, manager or security), another user having ‘security’ access level can log on, delete your user name, and create a new user name for you, with a new pass-word.

Alternatively, another user having ‘security’ access level can log in and initialize the device. This will return all configuration information, including pass-words, to the initial values.

In the case where no-one knows a password for a security level user, contact your supplier.

Using the Switch

You see network problems is on continuously with con(refer to "Port Traffic Statist

You are using PACE equipped Interactive Access feature of PAends of the link. Interactive Acenabled at one end of the Swabling Interactive Access for a described in "Setting Up the S4-12.

You have configured a Swit‘blips’ when a broadcast stoport does not blip properly

The broadcast storms are occuaverage broadcast bandwidth the Falling Threshold value. Thblip only occurs once.

Try changing the following attcast Storm Control section of

■ Rising Action to disable por

■ Falling Action to event + en

For more information, refer toSwitch Ports" on page 4-12.


Yat

YDncth

Ytr

Tbpati"5

dstation entries

TP is instructing B faster because the network.

anges by ich are directly to "Configuring age 5-20.

are Non-ageing; tabase (SDB)" on

tch, and using esilience; refer to page 5-17 and ge 4-19.

ou have added the Desktop Switch to an lready busy network, and response times and raffic levels have increased:

ou may have added a group of users to one of the esktop Switch ports via a repeater or switch, and ot turned off IFM. Turn off IFM on any port that is onnected to multiple devices. Refer to "Setting Up e Switch Ports" on page 4-12.

ou have connected an endstation directly to he Switch and the endstation fails to boot cor-ectly:

he Switch has STP enabled, and the endstation is ooting before the STP initialization process is com-lete. Specify that the port has Fast Start enabled, nd then reboot the endstation. For more informa-on about specifying Fast Start for a port, refer to Configuring the STP Parameters of Ports" on page -20.

The Switch keeps ageing out enin the Switch Database (SDB):

The Switch has STP enabled, and Sthe Switch to age entries in the SDtopology changes are occurring in

1 Reduce the number of topology chenabling Fast Start for all ports whconnected to an endstation; refer the STP Parameters of Ports" on p

2 Specify that the endstation entriesrefer to "Setting Up the Switch Dapage 4-16.

3 Consider disabling STP on the Swiresilient links to provide network r"Enabling STP on the Switch" on "Setting Up Resilient Links" on pa

ing the Switch C-5

ults in loss of contact

Us

You are trying to manage the Switch over a network which has STP, and you are losing con-tact with the management agent intermit-tently:

As shown in Figure C-1, there is a SuperStack II Switch unit (Switch A) between your management workstation and the Desktop Switch (Switch B). You have configured more than one VLAN on both Switch units, and there is a parallel STP path for each VLAN between the Switch units.

When Switch B transmits BPDUs across a VLAN other than VLAN 1, Switch A learns the MAC address of Switch B through the port on that VLAN. The management agent of Switch B is only accessible through VLAN 1, and so your manage-ment workstation cannot communicate with Switch B until it transmits BPDUs across VLAN 1. When that occurs, Switch A learns the MAC address of Switch B through the port on VLAN 1.

To avoid this situation, we recommend that you connect the two SuperStack II Switch units using a Virtual LAN Trunk (VLT). For more information about VLTs, refer to "Connecting Common VLANs Between Switch Units" on page 5-3.

Figure C-1 Network configuration that res


CaS-

D

Null Modem 9-pin to R

PIN-OUTS

ble232 25-pin

PC-AT Serial Cable9-pin to 9-pin

D-2 APPENDIX D: PIN-OUTS

Modem9 0BASE-T and

Cable-pin to RS-232 25-pin

RJ45 Pin AssignmentsPin assignments are identical for 1100BASE-TX RJ45 connectors.

TIONS

si

qu

tur

e

ns

om AS/NZS 3548 Class B*,

lass 2 requirements of ategory 3 or 5 for

ns

E

Physical Dimen

Environmental Re

Operating Tempera

Storage Temperatur

Operating Humidity

Standards

Safety

Agency Certificatio

AC Protection

Electromagnetic C

Heat Dissipation

Power Supply

AC Line Frequency

Input Voltage Optio

Current Rating

DESKTOP SWITCH TECHNICAL SPECIFICA

ons Height: 76mm (3.0 in.) x Width: 483mm (19.0 in.) x Depth 300mm (12.0 in.) Weight: 4.4kg (9.7lbs)

irements

e 0–50°C (32–122°F)

-10–70°C (14–158°F)

10–95% relative humidity, non-condensing

EN60068 (IEC68)

UL 1950, EN60950, CSA 22.2 No. 950

5A Time Delay Fuse

patibility EN55022 Class B*, FCC Part 15 Subpart B Class A, ICES-003 Class A, VCCI Class 2*,EN 50082-1

* Category 5 screened cables must be used to ensure compliance with the Class B/Cthis standard. The use of unscreened cables (Category 5 for 100BASE-TX ports, and C10BASE-T ports) complies with the Class A/Class 1 requirements.

100W maximum (341 BTU/hr maximum)

50–60 Hz

100–120 / 200–240 VAC

3A (maximum) at 100 VAC / 2A (maximum) at 200 VAC

E-2 APPENDIX E: DESKTOP SWITCH TECHNICAL SPECIFICATIONS

Standards Supported SNMP

SNMP pro

MIB-II (RF

Bridge M

Repeater

VLAN MI

RMON M

Terminal

Telnet (RF

tocol (RFC 1157)

C 1213)

IB (RFC 1493)

MIB (RFC 1516)

B (RFC 1573)

IB (RFC 1271 and RFC 1757)

Emulation

C 854)

Protocols Used for Administration

UDP (RFC 768)

IP (RFC 791)

ICMP (RFC 792)

TCP (RFC 793)

ARP (RFC 826)

TFTP (RFC 783)

BOOTP (RFC 951)

vinde

nb

t y s

icer dte

W

Bu

ac

or

eb

e lono

ww

e du

s releases, NetAge® ation, and more.

ftware, and drivers as technical articles. em or ISDN 24 hours

, set your modem to op bit. Call the :

Telephone Number

61 2 9955 2073

55 11 547 9666

33 1 6986 6954

4989 62732 188

852 2537 5608

39 2 27300680

81 3 3345 7266

52 5 520 7853

86 10 684 92351

65 534 5693

F

3Com proinformatioappendix

Informatiotime of pumend thaWide Web

Online Techn3Com offday, sevenonline sys

■ World

■ 3Com

■ 3ComF

■ 3ComF

World Wide W

Access thCorporatiURL into y

http://w

This servic3Com pro

TECHNICAL SUPPORT

des easy access to technical support through a variety of services. This scribes these services.

contained in this appendix is correct at lication. For the very latest, we recom-ou access 3Com Corporation’s World ite.

al Servicess worldwide product support 24 hours a ays a week, through the following

ms:

ide Web site

lletin Board Service (3ComBBS)

tsSM automated fax service

um on CompuServe® online service

Site

atest networking information on 3Com ’s World Wide Web site by entering our ur Internet browser:

.3Com.com/

features news and information about cts, customer service and support,

3Com Corporation’s latest newMagazine, technical document

3Com Bulletin Board Service

3ComBBS contains patches, sofor all 3Com products, as wellThis service is available via moda day, seven days a week.

Access by Analog Modem

To reach the service by modem8 data bits, no parity, and 1 sttelephone number nearest you

Country Data Rate

Australia up to 14400 bps

Brazil up to 14400 bps

France up to 14400 bps

Germany up to 28800 bps

Hong Kong up to 14400 bps

Italy (fee required) up to 14400 bps

Japan up to 14400 bps

Mexico up to 28800 bps

P. R. of China up to 14400 bps

Singapore up to 14400 bps

F-2 APPENDIX F: TECHNICAL SUPPORT

A

ISm3

3ComFa

33dp

Cu

Lfo

Service

ware, drivers, and roducts, as well pport. To use erve account.

nt.

um main menu.

Taiwa

U.K.

U.S.A

C

H

U

U

Coun Telephone Number

06 0228049

800 11062

0505 442 607

y)956 0815

900 964 445

020 792954

0800 626403

ccess by Digital Modem

DN users can dial in to 3ComBBS using a digital odem for fast access up to 56 Kbps. To access ComBBS using ISDN, use the following number:

(1) 408 654 2703

cts Automated Fax Service

Com Corporation’s interactive fax service, ComFacts, provides data sheets, technical articles, iagrams, and troubleshooting instructions on 3Com roducts 24 hours a day, seven days a week.

all 3ComFacts using your Touch-Tone telephone sing one of these international access numbers:

ocal access numbers are available within the llowing countries:

3ComForum on CompuServe® Online

3ComForum contains patches, softtechnical articles about all 3Com pas a messaging section for peer su3ComForum, you need a CompuS

To use 3ComForum:

1 Log on to your CompuServe accou

2 Type go threecom

3 Press [Return] to see the 3ComFor

n up to 14400 bps 886 2 377 5840

up to 28800 bps 44 1442 438278

. up to 28800 bps 1 408 980 8204

ountry Telephone Number

ong Kong 852 2537 5610

.K. 44 1442 438279

.S.A. 1 408 727 7021

try Data Rate Telephone NumberCountry

Telephone Number Country

Australia 1 800 123853 Netherlands

Belgium 0800 71279 Norway

Denmark 800 17319 Portugal

Finland 98 001 4444 Russia (Moscow onl

France 05 90 81 58 Spain

Germany 0130 81 80 63 Sweden

Italy 1678 99085 U.K.

etwork Supplier F-3

Sup

Sup

ne Number

3Com or 5000

5000 8022

92 568 (Beijing)4 0220 Ext 6115

) 1111 3974 91814711791068 5850151 4

029700

266266055266266

6 68 00

3235 8008790 (Berlin)320 (Munich)83 411351 14 14

7077

7251

Support from Your N

port from Your Network SupplierIf additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installation, hardware maintenance, application training, and support services.

When you contact your network supplier for assis-tance, have the following information ready:

■ A list of system hardware and software, includ-ing revision levels

■ Diagnostic error messages

■ Details about recent configuration changes, if applicable

If you are unable to contact your network supplier, see the following section on how to contact 3Com.

port from 3Com

If you are unable to receive support from your network supplier, technical support contracts are available from 3Com.

Contact your local 3Com sales office to find your authorized service provider using one of these numbers:

Regional Sales Office

Telepho

3Com CorporationU.S.

3Com ANZAEastWest

3Com Asia LimitedP. R. of China

Hong KongIndiaIndonesiaKoreaMalaysiaSingaporeTaiwan (R.O.C.)Thailand

3Com Benelux B.V.BelgiumNetherlands

3Com CanadaCalgaryMontrealOttawaTorontoVancouver

3Com France

3Com GmbHAustriaCzech/Slovak RepublicsGermany

HungaryPolandSwitzerland

3Com Ireland

3Com Japan

800 NET 1 408 764

61 2 993761 3 9866

86 10 68486 21 637(Shanghai852 250191 11 64462 21 52382 2 319 60 3 732 65 538 93886 2 377662 231 8

32 725 0231 30 602

403 265 3514 683 3613 566 7416 498 3604 434 3

33 1 69 8

43 1 513442 2 218449 30 34949 89 62736 1 250 48 22 64541 31 996

353 1 820

81 3 3345

F-4 APPENDIX F: TECHNICAL SUPPORT

ReturnBreA3th

T

R

3ABCCMPV

3I

3

3DFNS

3

3

3

Fax Number

408 764 7120

408 764 7120

44 1442 435822

1 408 764 7120

ing Products for Repairefore you send a product directly to 3Com for pair, you must first be obtain a Return Materials uthorization (RMA) number. Products sent to Com without RMA numbers will be returned to e sender unopened, at the sender’s expense.

o obtain an RMA number, call or fax:

02/06/97

egional Sales Office Telephone Number

Com Latin Americargentinarazilhileolombiaexico

eruenezuela

Com Mediterraneotaly

Com Middle East

Com Nordic ABenmarkinlandorwayweden

Com Russia

Com South Africa

Com U.K. Limited

54 1 312 326655 11 546 086956 2 633 924257 1 629 411052 5 520 784151 1 221 539958 2 953 8122

39 2 253011 (Milan)39 6 5279941 (Rome)

971 4 349049

45 39 27 85 00358 0 435 420 6747 22 18 40 0346 8 632 56 00

007 095 2580940

27 11 807 4397

44 131 2478558 (Edinburgh)44 161 8737717 (Manchester)44 1628 897000 (Marlow)

Location Telephone Number

U.S.A. and Canada 1 800 876 3266, option 2

Latin America 1 408 326 7801

Europe, South Africa and Middle East

44 1442 438125

Elsewhere 1 408 326 7804

R

0d

Et

Et1

ataid

osmetse

f ng

evice addresses, and an unknown address. sed to connect the r network. Note that

known as designated

in bits per second, he bandwidth of

idth of Fast Ether-

Also known as line

u to automatically MAC address each ition, the protocol d default gateway to

GLOSSA

10BASE-T

The IEEE 8Unshielde

100BASE-FX

100Mbps

100BASE-TX

100Mbpsand Type

ageing

The automSwitch Dalonger val

ATM

Asynchronented trancells (packrange of usignals.

backbone

The part otransporti

Y

2.3 specification for Ethernet over Twisted Pair (UTP) cabling.

hernet implementation over fiber.

hernet implementation over Category 5 Twisted Pair cabling.

tic removal of dynamic entries from the base which have timed-out and are no .

us Transfer Mode. A connection ori-ission protocol based on fixed length

s). ATM is designed to carry a complete r traffic, including voice, data and video

a network used as the primary path for traffic between network segments.

backbone port

A port which does not learn dwhich receives all frames with Backbone ports are normally uSwitch to the backbone of youbackbone ports were formerlydownlink ports.

bandwidth

Information capacity, measuredthat a channel can transmit. TEthernet is 10Mbps, the bandwnet is 100Mbps.

baud rate

The switching speed of a line.speed.

BOOTP

The BOOTP protocol allows yomap an IP address to a given time a device is started. In addcan assign the subnet mask ana device.

2 GLOSSARY

bridge

Awintr

broadca

An

broadca

Man

console

Tmmuo

CSMA/C

C8aoath

corporate net--performance d backbone con-

twork manage-

tly by Xerox, ration. Ethernet CSMA/CD to run

Ethernet/CD net-

ward its destina-

e transmitted and ect, doubles the

eans of holding of the connected a congested

device that interconnects local or remote net-orks no matter what higher level protocols are volved. Bridges form a single logical network, cen-alizing network administration.

st

message sent to all destination devices on the etwork.

st storm

ultiple simultaneous broadcasts that typically bsorb available network bandwidth and can cause etwork failure.

port

he port on the Switch accepting a terminal or odem connector. It changes the parallel arrange-ent of data within computers to the serial form sed on data transmission links. This port is most ften used for dedicated local management.

D

hannel access method used by Ethernet and IEEE 02.3 standards in which devices transmit only fter finding the data channel clear for some period f time. When two devices transmit simultaneously, collision occurs and the colliding devices delay eir retransmissions for a random amount of time.

data center switching

The point of aggregation within a work where a switch provides highaccess to server farms, a high-speenection and a control point for nement and security.

Ethernet

A LAN specification developed joinIntel and Digital Equipment Corponetworks operate at 10Mbps usingover cabling.

Fast Ethernet

100Mbps technology based on thework access method.

forwarding

The process of sending a frame totion by an internetworking device.

full duplex

A system which allows frames to breceived simultaneously and, in effpotential throughput of a link.

IFM

Intelligent Flow Management. A mpackets back at the transmit port endstation. Prevents packet loss atswitch port.

GLOSSARY 3

Inte

IPX

IP ad

LAN

laten

line

carries data traffic in

A type of Ethernet DI ports connect to

straight-through DI and MDIX-to-MDIX ir cabling.

. Stores a device’s d parameters. MIBs

rk Management Proto-s of their managed

ts own internal MIB.

cific subset of net-es are specified in f the packet.

. 3Com’s innovative njunction with a nd jitter associated media traffic over

l test that the Switch -up.

lligent Switching Mode

A packet forwarding mode, where the Switch moni-tors the amount of error traffic on the network and changes the method of packet forwarding accord-ingly.

Internetwork Packet Exchange. A protocol allowing communication in a NetWare network.

dress

Internet Protocol address. A unique identifier for a device attached to a network using TCP/IP. The address is written as four octets separated with full-stops (periods), and is made up of a network section, an optional subnet section and a host sec-tion.

Local Area Network. A network of connected com-puting resources (such as PCs, printers, servers) cov-ering a relatively small geographic area (usually not larger than a floor or building). Characterized by high data rates and low error rates.

cy

The delay between the time a device receives a frame and the time the frame is forwarded out of the destination port.

speed

See baud rate.

main port

The port in a resilient link thatnormal operating conditions.

MDI / MDIX

Medium Dependent Interface.twisted pair port connection: MMDIX (cross-over) ports using twisted pair cabling; MDI-to-Mlinks use cross-over twisted pa

MIB

Management Information Basemanagement characteristics anare used by the Simple Netwocol (SNMP) to contain attributesystems. The Switch contains i

multicast

Single packets copied to a spework addresses. These addressthe destination-address field o

PACE

Priority Access Control Enabledtechnology which works in coswitch to control the latency awith the transmission of multiEthernet and Fast Ethernet.

POST

Power On Self Test. An internacarries out when it is powered

4 GLOSSARY

protoco

Aos

resilient

Awfa

RJ-45

Sn

RMON

Raati

RPS

Rpw

server f

Aa

SLIP

Sa

devices and logi-e the computa-ment station and

ic on the net-

ocol. A protocol anaging TCP/IP ented on a orking equip-

many aspects of .

g fault tolerance g you to imple-

affic, and ensure when the main if the main

take over data e link fails.

l

set of rules for communication between devices n a network. The rules dictate format, timing, equencing and error control.

link

pair of ports that can be configured so that one ill take over data transmission should the other il. See also main port and standby port.

tandard 8-wire connectors for IEEE 802.3 10BASE-T etworks.

emote Monitoring. Subset of SNMP MIB II which llows monitoring and management capabilities by ddressing up to ten different groups of informa-on.

edundant Power System. Part of the SuperStack II roduct range, provides a backup source of power hen connected to the Switch.

arm

cluster of servers in a centralized location serving large user population.

erial Line Internet Protocol. A protocol which llows IP to run over a serial line connection.

SmartAgent

Intelligent management agents in cal connectivity systems that reductional load on the network managereduce management-oriented traffwork.

SNMP

Simple Network Management Protoriginally designed to be used in minternets. SNMP is presently implemwide range of computers and netwment and may be used to managenetwork and endstation operation

Spanning Tree Protocol (STP)

A bridge-based system for providinon networks. STP works by allowinment parallel paths for network trthat redundant paths are disabled paths are operational and enabledpaths fail.

standby port

The port in a resilient link that willtransmission if the main port in th

STP

See Spanning Tree Protocol (STP).

GLOSSARY 5

swit

TCP/

Teln

TFTP

Tran

UDP

n- and topol-communicate as if l LAN.

-Switch link which on each Switch.

ASCII characters. ed appearance.

ch

A device which filters, forwards and floods frames based on the frame’s destination address. The switch learns the addresses associated with each switch port and builds tables based on this informa-tion to be used for the switching decision.

IP

A layered set of communications protocols providing Telnet terminal emulation, FTP file transfer, and other services for communication among a wide range of computer equipment.

et

A TCP/IP application protocol that provides virtual terminal service, letting a user log in to another computer system and access a host as if the user were connected directly to the host.

Trivial File Transfer Protocol. Allows you to transfer files (such as software upgrades) from a remote device using your Switch’s local management capa-bilities.

scend®

3Com’s umbrella management system used to manage all of 3Com’s networking solutions.

User Datagram protocol. An Internet standard proto-col that allows an application program on one device to send a datagram to an application pro-gram on another device.

VLAN

Virtual LAN. A group of locatioogy-independent devices that they are on a common physica

VLT

Virtual LAN Trunk. A Switch-tocarries traffic for all the VLANs

VT100

A type of terminal which usesVT100 screens have a text-bas

6 GLOSSARY

-2 1 SF-3

-3

21

ingon

ltp)er

nd

-24-

3d

5

-25

-6creen 4-25

t This Guide 2uide 2

ort) 6-3andwidth (port) 6-3 (port traffic) 6-4

ffic) 6-4ort error) 6-66-5

6-2ffic) 6-5

s (port traffic) 6-5rt traffic) 6-5mmary) 6-2 (port traffic) 6-5 (port) 6-3 (summary) 6-2ort traffic) 6-4ummary) 6-2d (port traffic) 6-4d (summary) 6-2affic) 6-5) 6-6rror) 6-6error) 6-6 (port traffic) 6-4 (summary) 6-2

tted (summary) 6-2ort traffic) 6-4 (port traffic) 6-4

INDEX

Numerics100BASE-TX port 110BASE-T port 1-2,3Com Bulletin Board3Com sales offices3Com URL F-13ComFacts F-23ComForum F-2

AAccess Level field 4access rights B-1Active Port field 4-ageing entries 4-16ageing time, specifyagent software versialarm actions 5-27alarm settings, defauAlarms (RMON grouAsynchronous TransfATM 1-2ATM Module 1-2ATM networks, exteaudit log 5-28Auto Config field 4auto configurationauto logout 3-12Auto Logout screenAutoSelect VLAN Mo

specifying 5-11

Bbackbone port 1-2,

, 1-9-9ervice (3ComBBS) F-1

, 4-22

4-10 number 6-8

5-285-23

Mode. See ATM

ing VLANs into 5-5

525

-12e 5-4

-8

specifying 5-10Backbone Port field 4-11, 5-9Backup VLAN Server IP Address field 5-11baud rate. See line speedboot software version number 6-8BOOTP Select field 3-10BOOTP server 3-6BPDUs. See Bridge Protocol Data UnitsBridge Forward Delay field 5-19Bridge Hello Time field 5-19Bridge Identifier 5-14Bridge Max Age field 5-19Bridge Priority field 5-19Bridge Protocol Data Units 5-14bridges vs Desktop Switch 1-3Broadcast Storm Control field 4-14Bulletin Board Service F-1

Ccable

maximum length 1-9, 2-2pin-outs D-1

Capture (RMON group) 5-23Char Size field 4-26Community String field 4-3, 4-5, 4-24community strings

changing 4-5entering 4-3role in trap setup 4-24VLAN Server 5-11

Community-SNMP field 4-6CompuServe F-2Connection Type field 4-25console port 1-11

auto-configuration 4-25connecting equipment to 2-7

connection type 4setting up 4-25speed 4-25

Console Port field 4Console Port Setup sconventions

notice icons, Aboutext, About This G

countersBandwidth Used (pBroadcast Frame BBroadcast ReceivedCollisions (port traCRC Align Errors (pErrors (port traffic)Errors (port) 6-3Errors (summary)Fragments (port traFrame Size AnalysiFrames Filtered (poFrames Filtered (suFrames ForwardedFrames ForwardedFrames ForwardedFrames Received (pFrames Received (sFrames TransmitteFrames TransmitteIFM Count (port trJabbers (port errorLate Events (port eLong Frames (port Multicasts ReceivedMulticasts ReceivedMulticasts TransmiOctets Received (pOctets Transmitted

2 INDEX

resettinShort Ev

Create Use

DData Link Database database. DCD Contdefault

passworroutersettingsusers 3

Default RMDefault RoDefault VLDelete UseDesignatedDesignatedDesignateddesignatedDesignatedDesignatedDesktop S

desktopdimensifeaturesfront vieinitializininstallinLEDs 1loggingloggingmanageport setpowerinrack morear viewresettingsize E-stackingunit def

0

trix 4-11

1

, 5-20

-10ss 4-13

13

14

ment 4-124-9

g to zero 6-2, 6-5, 6-7ents (port error) 6-6r screen 4-3

Protocol field 3-10Entries field 4-17See Switch Databaserol field 4-25

ds 3-73-10

1-12-7ON Host/Matrix field 4-11

uter field 3-10AN 5-3, 5-9rs screen 4-4 Bridge field 5-21 Bridge Port 5-14 Cost field 5-21 downlink port. See backbone port Port field 5-20 Root field 5-18, 5-20

witch 1-1 configuration 1-7ons E-1

1-1w 1-8g 4-28

g 2-4-9 off 3-12 on 3-7ment setup 3-9up 4-12g-up 2-6unting 2-4

1-104-27

1 with other units 2-4aults 1-12

unit setup 4-9upgrading software 4-29wall mounting 2-5weight E-1

Destination field 4-29Device IP Address field 3-10Device Subnet Mask field 3-10Disable Interactive Access field 4-13Downlink Module. See Plug-in Moduledownlink port. See backbone portDSR Control field 4-25Duplex Mode field 4-11, 4-13

EEdit User screen 4-5Ethernet address label 1-11Events (RMON group) 5-24

FFalling Action field 4-15Falling Threshold% field 4-14Fast Boot tests 3-9Fast Ethernet configuration rules 2-2Fast Start field 5-21Fault Log screen 6-9Fault Log, interpreting 6-9fax service. See 3ComFactsfields

Access Level 4-3Active Port 4-21, 4-22Auto Config 4-25Backbone Port 4-11, 5-9Backup VLAN Server IP Address 5-11BOOTP Select 3-10Bridge Forward Delay 5-19Bridge Hello Time 5-19Bridge Max Age 5-19Bridge Priority 5-19Broadcast Storm Control 4-14Char Size 4-26Community String 4-3, 4-5, 4-24

Community-SNMP 4-6Connection Type 4-25Console Port 4-6Data Link Protocol 3-1Database Entries 4-17DCD Control 4-25Default RMON Host/MaDefault Router 3-10Designated Bridge 5-2Designated Cost 5-21Designated Port 5-20Designated Root 5-18Destination 4-29Device IP Address 3-10Device Subnet Mask 3Disable Interactive AcceDSR Control 4-25Duplex Mode 4-11, 4-Falling Action 4-15Falling Threshold% 4-Fast Start 5-21File Name 4-29Flow Control 4-25Forward Delay 5-19Forwarding Mode 4-9Fwd Transitions 5-21Hello Time 5-18Hold Time 5-19Intelligent Flow ManageIntelligent ForwardingIP or IPX Address 4-24IPX Network 3-10Link State 4-12, 4-20Lost Links 4-12MAC Address 4-17MAC address 3-9MAIN Port 4-22Main Port ID 4-20Management Level 4-7Max Age 5-18Node 3-10PACE 4-10Pair Enable 4-21, 4-23Pair State 4-20, 4-22

INDEX 3

ParPasPatPerPluPoPoPoPoPoPoPoPriReRisRisRoRoSDSecSerSLISLISpSpStaSTAStaStoSTPsysSysThTimToTraTypUnUsVLVLVLVLVL

-10

3-5

, 4-204-6

3-9, 4-171-113-6

3-82-20ersion number 6-8

ield 4-7screen 3-9) 5-23

n example 1-7port F-3

4-16lsN-based networks 5-5

ity 4-26sword 4-3h Cost 5-21manent 4-17g-in Module Type 4-11ll Period 5-11rt Enable 5-21rt Number 4-17rt Speed 4-12rt State 4-12wer On Self Test Type 3-9wer Supply 4-11ority 5-21mote Telnet 4-6ing Action 4-14ing Threshold% 4-14ot Cost 5-18ot Port 5-19B Ageing Time 4-10urity 4-13ver Address 4-29P Address 3-10P Subnet Mask 3-10anning Tree 4-10eed 4-26ndby Links Available 4-20NDBY Port 4-22

ndby Port ID 4-20p Bit 4-26 State 5-20

Name 4-9tem Up Time 6-8rottle 4-24e Since Topology Change 5-19

pology Changes 5-18nsceiver Module Type 4-11e 5-8it Name 4-9er Name 4-3, 4-5AN Configuration Mode 4-10, 4-14AN ID 5-9, 5-18AN Membership 5-9AN Server Community String 5-11AN Server IP Address 5-11

VLT Mode 4-13File Name field 4-29Filter (RMON group) 5-23Flow Control field 4-25Forward Delay field 5-19forwarding 1-3Forwarding Mode field 4-9full duplex 1-4

configuration rules 2-2enabling and disabling 4-11, 4-13

fuse, changing A-3Fwd Transitions field 5-21

Hhardware version number 6-8Hello BPDUs 5-15Hello Time 5-14Hello Time field 5-18History (RMON group) 5-22Hold Time field 5-19Hosts (RMON group) 5-23Hosts Top N (RMON group) 5-23

IIFM. See Intelligent Flow ManagementInitialization screen 4-28initializing the Switch 4-28installing the Switch 2-4Intelligent Flow Management 1-4Intelligent Flow Management field 4-12Intelligent Forwarding field 4-9Intelligent Switching Mode 1-4Interactive Access, disabling 4-13IP address

default router 3-10device 3-10entering 1-13format 3-2

IP or IPX Address field 4-24IP protocol 1-12IPX address 1-13

IPX Network field 3IPX protocol 1-12

Kkeyboard shortcuts

LLEDs 1-9line speed 4-26Link State field 4-12Local Security screenlogging off 3-12logging on 3-7Logon screen 3-7Lost Links field 4-12

MMAC Address fieldMAC address labelMain Banner screenMain Menu screenMAIN Port field 4-2Main Port ID field 4management agent vManagement Level fManagement Setup Matrix (RMON groupMax Age 5-15Max Age field 5-18

Nnetwork configurationetwork supplier supNode field 3-10non-ageing entriesnon-routable protoco

limitations for VLA

4 INDEX

Oon-line tec

PPACE 1-6

disablinPACE fieldpackets, pPair EnablePair State Parity fieldPassword passwords

changindefaultforgettinnew 4

Path Cost path costspermanen

displayinspecifyin

Permanenpin assign

modemnull moRJ45 Dserial ca

pin-outsPlug-in MoPlug-in MoPlug-in MoPoll Periodport

100BAS10BASEbackbonconsoleenablingspeedstate 4

air F-4

4-14

5-28Hosts and

5

25

9

hnical services F-1

g Interactive Access for a port 4-134-10

rocessing 1-3 field 4-21, 4-23

field 4-20, 4-224-26

field 4-3

g 4-53-7g 4-5

-3field 5-21, default 5-14t entries 4-16g 4-17g 4-17, 4-18

t field 4-17ments cable D-2dem cable D-1-2ble D-1D-1dule 1-2dule slot 1-11dule Type field 4-11 field 5-11

E-TX 1-2, 1-9-T 1-2, 1-9e 1-2, 5-8, 5-91-11

and disabling 4-124-12-12

statistics 6-3Port Enable field 5-21Port Error Analysis screen 6-6Port Number field 4-17Port Resilience screen 4-20Port Setup screen 4-12Port Speed field 4-12Port State field 4-12Port Statistics screen 6-3Port STP screen 5-20Port Traffic Statistics screen 6-4Port VLAN Mode 5-4Power On Self Test Type field 3-9power supply 1-11Power Supply field 4-11powering-up 2-6Priority field 5-21problem solving C-1

Qquick start for SNMP users 1-13

Rrack mounting 2-4Redundant Power System. See RPSRemote Monitoring. See RMONRemote Poll screen 6-10remote polling 6-10Remote Telnet field 4-6reset button 1-11Reset screen 4-27reset, time since last 6-8resets

number of 6-8type 6-8

resetting the Switch 4-27resilient link pair 4-19resilient links 1-5, 4-19

configuring 4-20creating 4-21deleting 4-21

rules 4-19, 4-24viewing 4-22

returning products for repRising Action field 4-14Rising Threshold% fieldRMON 5-22

alarm actions 5-27benefits 5-24default alarm settingsenabling and disabling

Matrix 4-11features supported 5-2groups supported 5-25probe 5-22

Root Bridge 5-14Root Cost field 5-18Root Path Cost 5-14Root Port field 5-19RPS 1-11

connecting 2-6

Ssafety information

English A-1French A-4German A-6

screens 4-1access rights B-1Auto Logout 3-12Console Port Setup 4-Create User 4-3Delete Users 4-4Edit User 4-5Fault Log 6-9Initialization 4-28Local Security 4-6Logon 3-7Main Banner 3-6Main Menu 3-8Management Setup 3-Port Error Analysis 6-6Port Resilience 4-20Port Setup 4-12

INDEX 5

PoPoPoReReSoStaSuSwTraUnUnUnUsVLVLVL

SDB AsecurSecurserialserialServeSLIP ASLIP SSNMP

Coqu

sockepoRP

SoftwsoftwSpanSpanspecifSpeedstandStandSTANStandstatis

coupo

F-2

nnecting 2-72-7

Change field 5-19ld 5-181-2lot 1-11ype field 4-11-24

4-24

1

screen 4-17

ary screen 4-22-9 version number 6-84-29

reen 4-2, 4-5

4-5

rt Statistics 6-3rt STP 5-20rt Traffic Statistics 6-4mote Poll 6-10set 4-27ftware Upgrade 4-29tus 6-8mmary Statistics 6-2itch Management 4-7p Setup 4-24it Database View 4-17it Resilience Summary 4-22it Setup 4-9er Access Levels 4-2AN Server 5-11AN Setup 5-8AN STP 5-18

geing Time field 4-10ity 1-5ity field 4-13 number, location on unit 1-11 port. See console portr Address field 4-29ddress field 3-10ubnet Mask field 3-10

1-12, 3-6mmunity 4-6ick start 1-13twer 1-11S 1-11are Upgrade screen 4-29are version number 6-8ning Tree field 4-10ning Tree Protocol. See STPications, system E-1 field 4-26

ards supported E-2by Links Available field 4-20DBY Port field 4-22by Port ID field 4-20

tics 6-1nters. See counters

rt 6-3

port error 6-6port traffic 6-4summary 6-2

Statistics (RMON group) 5-22Status screen 6-8Stop Bit field 4-26STP 1-6, 5-12

Bridge Identifier 5-14Bridge Protocol Data Units 5-14configurations 5-16configuring port properties 5-20configuring VLAN properties 5-18default path costs 5-14Designated Bridge Port 5-14enabling and disabling 4-10, 5-17Hello BPDUs 5-15Hello Time 5-14Max Age 5-15Root Bridge 5-14Root Path Cost 5-14

STP State field 5-20subnet mask, device 3-10Summary Statistics screen 6-2Switch Database 4-16

adding an entry 4-18ageing entries 4-16configuring 4-17deleting an entry 4-18non-ageing entries 4-16permanent entries 4-16searching 4-18

Switch Management screen 4-7sysName field 4-9System Up Time field 6-8system, specifications E-1

Ttechnical support F-1

3Com URL F-1Bulletin Board Service F-1fax service F-2network suppliers F-3product repair F-4

using CompuServeTelnet 3-2, 4-6terminal emulator, coterminal, connectingThrottle field 4-24Time Since Topology Topology Changes fieTransceiver ModuleTransceiver Module sTransceiver Module TTrap Setup screen 4traps

community stringssetting up 4-24throttle 4-24

trouble-shooting C-Type field 5-8

UUnit Database View unit defaults 1-12Unit Name field 4-9Unit Resilience SummUnit Setup screen 4upgradable softwareupgrading softwareURL, 3Com F-1User Access Levels scUser Name field 4-3users

access levels 4-6changing namescreating 4-3default 3-7deleting 4-4editing 4-5names 4-3passwords 4-3setting up 4-2

6 INDEX

Vversion nu

boot sohardwaupgrada

Virtual LANVirtual LANVLAN ConVLAN ID fVLAN MemVLAN ServVLAN ServVLAN ServVLAN ServVLAN SetuVLAN STP VLANs 1-

assigninAutoSelDefaultextendinPort VLAsetting uusing nousing unVLTs 5

VLT ModeVLTs 5-3,VT100 inte

accessindefinitiologgingnavigati

VT100 ter

Wwall mounWorld Wid

mberftware 6-8re 6-8ble software 6-8 Trunks. See VLTss. See VLANs

figuration Mode field 4-10, 4-14ield 5-9, 5-18

bership field 5-9er 5-4er Community String field 5-11er IP Address field 5-11er screen 5-11p screen 5-8screen 5-185, 5-1g ports 5-10ect VLAN Mode 5-4

5-3, 5-9g into an ATM network 5-5N Mode 5-4p 5-8, 5-10n-routable protocols 5-5ique MAC addresses 5-5

-8 field 4-13 5-8rfaceg 3-1n 1-12

on 3-7ng 3-4minal, connecting 2-7

ting 2-5e Web (WWW) F-1

Zzeroing screen counters 6-2, 6-5, 6-7

3Com

HARD

3Com materiaof purc

If a pro3Com CustomCustomreplacerecondthe rem

3Com of Cusfor rep

SOFTW

3Com conformthe datcontain3Com’discretiproducto 3Coselectio3Com combinthird-pfree, oproduccompathe no

STAN

StandadefectiCorporwarrantelepho

s Corporate Service Center must orization (RMA) number marked , and packaged appropriately for ped to Customer, at 3Com’s

he defective product by 3Com.

TED ABOVE, CUSTOMER’S SOLE EPAIR, REPLACEMENT, OR TION. TO THE FULL EXTENT REMEDIES ARE EXCLUSIVE AND ONDITIONS, EXPRESS OR TATUTORY OR OTHERWISE,

ERCHANTABILITY, FITNESS FOR . 3COM NEITHER ASSUMES NOR NY OTHER LIABILITY IN ANCE, OR USE OF ITS

F ITS TESTING AND THE PRODUCT DOES NOT EXIST ON’S MISUSE, NEGLECT, ATTEMPTS TO REPAIR OR F THE INTENDED USE, OR BY

EXCLUDES FOR ITSELF AND ITS CT OR TORT (INCLUDING ECT, SPECIAL, OR PUNITIVE

R PROFITS, LOSS OF BUSINESS, L LOSS ARISING OUT OF OR IN ANCE, USE, PERFORMANCE, 3COM OR ITS AUTHORIZED CH DAMAGES, AND LIMITS ITS E PURCHASE PRICE PAID, AT MAGES WILL NOT BE AFFECTED

SSENTIAL PURPOSE.

clusion or limitation of implied l damages for certain products ry, so the above limitations and s warranty gives you specific

he state of California.

A 95052-8145

Corporation LIMITED WARRANTY

WARE

warrants its hardware products to be free from defects in workmanship and ls, under normal use and service, for the following lengths of time from the date hase from 3Com or its Authorized Reseller:

duct does not operate as warranted above during the applicable warranty period, shall, at its option and expense, repair the defective product or part, deliver to er an equivalent product or part to replace the defective item, or refund to er the purchase price paid for the defective product. All products that are

d will become the property of 3Com. Replacement products may be new or itioned. Any replaced or repaired product or part has a ninety (90) day warranty or ainder of the initial warranty period, whichever is longer.

shall not be responsible for any software, firmware, information, or memory data tomer contained in, stored on, or integrated with any products returned to 3Com air, whether under warranty or not.

ARE

warrants that the software programs licensed from it will perform in substantial ance to the program specifications therefor for a period of ninety (90) days from

e of purchase from 3Com or its Authorized Reseller. 3Com warrants the media ing software against failure during the warranty period. No updates are provided.

s sole obligation with respect to this express warranty shall be (at 3Com’s on) to refund the purchase price paid by Customer for any defective software ts, or to replace any defective media with software which substantially conforms m’s applicable published specifications. Customer assumes responsibility for the n of the appropriate applications program and associated reference materials. makes no warranty or representation that its software products will work in ation with any hardware or applications software products provided by

arties, that the operation of the software products will be uninterrupted or error r that all defects in the software products will be corrected. For any third-party ts listed in the 3Com software product documentation or specifications as being tible, 3Com will make reasonable efforts to provide compatibility, except where ncompatibility is caused by a “bug” or defect in the third-party’s product.

DARD WARRANTY SERVICE

rd warranty service for hardware products may be obtained by delivering the ve product, accompanied by a copy of the dated proof of purchase, to 3Com’s ate Service Center or to an Authorized 3Com Service Center during the applicable ty period. Standard warranty service for software products may be obtained by ning 3Com’s Corporate Service Center or an Authorized 3Com Service Center,

within the warranty period. Products returned to 3Com’be pre-authorized by 3Com with a Return Material Authon the outside of the package, and sent prepaid, insuredsafe shipment. The repaired or replaced item will be shipexpense, not later than thirty (30) days after receipt of t

WARRANTIES EXCLUSIVE

IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANREMEDY FOR BREACH OF THAT WARRANTY SHALL BE RREFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPALLOWED BY LAW, THE FOREGOING WARRANTIES ANDARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CIMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, SINCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MA PARTICULAR PURPOSE, AND SATISFACTORY QUALITYAUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ACONNECTION WITH THE SALE, INSTALLATION, MAINTENPRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IEXAMINATION DISCLOSE THAT THE ALLEGED DEFECT INOR WAS CAUSED BY CUSTOMER’S OR ANY THIRD PERSIMPROPER INSTALLATION OR TESTING, UNAUTHORIZED MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.

LIMITATION OF LIABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRANEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRDAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OLOSS OF INFORMATION OR DATA, OR OTHER FINANCIACONNECTION WITH THE SALE, INSTALLATION, MAINTENFAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SULIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF TH3COM’S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAIF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS E

Some countries, states, or provinces do not allow the exwarranties or the limitation of incidental or consequentiasupplied to consumers or the limitation for personal injuexclusions may be limited in their application to you. Thilegal rights which may vary depending on local law.

GOVERNING LAW This Limited Warranty shall be governed by the laws of t

3Com Corporation, 5400 Bayfront Plaza, Santa Clara, C(1)(408) 764-5000

9/1/96

Network adapters Lifetime

Other hardware products (unless otherwise specified above) 1 year

Spare parts and spare kits 90 days

ELECTRO

FCC STAT

This equipmdigital deviceprovide reasoperated in radiate radioinstructions,this equipmecommunicattheir own ex

CSA STAT

This Class Ainterference-

Cet appareille matériel b

VCCI STA

ion reception, which can er is encouraged to try to easures:

uipment and receiver are

enced radio/television following booklet ul:

Office, Washington, DC

be used only with cables

-MAGNETIC COMPATIBILITY STATEMENTS

EMENT

ent has been tested and found to comply with the limits for a Class A , pursuant to part 15 of the FCC rules. These limits are designed to

onable protection against harmful interference when the equipment is a commercial environment. This equipment generates, uses and can frequency energy and, if not installed and used in accordance with the

may cause harmful interference to radio communications. Operation of nt in a residential area is likely to cause harmful interference to radio

ions, in which case the user will be required to correct the interference at pense.

EMENT

digital apparatus meets all requirements of the Canadian Causing Equipment Regulations.

numérique de la classe A respecte toutes les exigences du Règlement sur rouilleur du Canada.

TEMENT

INFORMATION TO THE USER

If this equipment does cause interference to radio or televisbe determined by turning the equipment off and on, the uscorrect the interference by one or more of the following m

■ Reorient the receiving antenna.

■ Relocate the equipment with respect to the receiver.

■ Move the equipment away from the receiver.

■ Plug the equipment into a different outlet so that eqon different branch circuits.

If necessary, the user should consult the dealer or an experitechnician for additional suggestions. The user may find theprepared by the Federal Communications Commission helpf

How to Identify and Resolve Radio-TV Interference Problems

This booklet is available from the U.S. Government Printing 20402, Stock No. 004-000-00345-4.

In order to meet FCC emissions limits, this equipment mustwhich comply with IEEE 802.3.

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