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Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

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Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5
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Page 1: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Version 4.1

Configuring Network Devices

Working at a Small-to-Medium Business or ISP – Chapter 5

Page 2: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Objectives

• Configure a router with an initial configuration.

• Use Cisco SDM to configure a Cisco ISR with LAN connectivity, Internet connectivity and NAT.

• Configure a Cisco router for LAN connectivity, Internet connectivity and NAT using the Cisco IOS CLI.

• Configure a WAN connection from customer premises to an ISP.

• Describe, setup and configure a standalone LAN switch.

Page 3: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration• ISR (Integrated Services Router combines routing, LAN

switching, security, voice, & WAN connectivity features.• Ideal for small to medium-sized businesses & ISP

managed customers.

Page 4: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration• Cisco IOS – offered in modules called images• IP Base image: entry-level Cisco IOS• Images are specific to models of devices

Page 5: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Cisco 1841 Modular routerTable 1 Memory Requirements for Cisco 1841 Modular Router

Platform Feature Set

  Flash RAM

Image Memory1 Memory

Cisco 1841 IP Base c1841-ipbase-mz 64 MB 128 MB

  IP Voice c1841-ipvoice-mz 64 MB 192 MB

  Enterprise Base c1841-entbase-mz 32 MB 128 MB

  Advanced Security c1841-advsecurityk9-mz

64 MB 192 MB

  SP Services c1841-spservicesk9-mz 64 MB 192 MB

  Enterprise Services c1841-entservicesk9-mz

64 MB 192 MB

  Advanced IP Services

c1841-advipservicesk9-mz

64 MB 192 MB

  Advanced Enterprise Services

c1841-adventerprisek9-mz

64 MB 192 MB

Page 6: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

CISCO IOS Image: Types of Images• Two main types of image your router may use:

1. System image - complete Cisco IOS software. This image is loaded when your router boots and is used most of the time.

– On most platforms, the image is located in Flash memory.

2. Boot image - A subset of the Cisco IOS software. This image is used to perform network booting or to load Cisco IOS images onto the router. This image is also used if the router cannot find a valid system image. Depending on your platform, this image may be called xboot image, rxboot image, bootstrap image, or boot loader/helper image.

• On some platforms, the boot image is contained in ROM. In others, the boot image can be stored in Flash memory. On these platforms, you can specify which image should be used as the boot image using the boot bootldr global configuration command. Refer to your hardware documentation for information about the boot image used on your router.

Page 7: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Image Naming Convention

• You can identify the platform, features and image location by the image name.

• Naming convention is: platform – features – type

• Example: c2600-js-l_121-3.bin• c2600 - hardware platform• js - features set (enterprise)• l - file format (relocatable, not compressed)• 121-3 - version & release # (version 12.1 release 3)

Page 8: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Image Naming Convention - continued

• Platform – variable platform that can use image– For example c1700, c2600, c7000

• Features –feature sets supported by image.• Type – can contain following characters

• f—The image runs from Flash memory. • • m—The image runs from RAM. • • r—The image runs from ROM. • • l—The image is relocatable. • • z—The image is zip compressed. • • x—The image is mzip compressed.

Page 9: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration• Tools and equipment required for setup:

Page 10: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router ConfigurationThree-stage bootup process:• Power-on self test (POST)• Locate and load Cisco IOS • Locate startup configuration file or enter setup mode

Page 11: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Bootup Process - contd• POST (Power On Self Test) – test hardware• After POST, the bootstrap program is loaded• Bootstrap locates IOS and loads it into RAM

– IOS can be located – flash memory, TFTP server, or another location

– By default, IOS loads from flash• After IOS is loaded, bootstrap locates startup

configuration file in NVRAM (non-volatile random access memory)

• Startup configuration – when loaded into RAM (working memory), it become the “running” configuration.

Page 12: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Loading Cisco IOS

Get default IOS from FLASH

Flash empty

Get IOS from TFTP Server

TFTP Server empty

Get limited Cisco IOS from ROM

Page 13: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Show version command output

• Router>show version• IOS version• Bootstrap program stored in ROM• Complete filename of IOS• Type of CPU; amount of RAM• Number & type of interfaces• Amount of NVRAM (used to store startup config)• Amount of Flash (used to store IOS• Configuration register in hex

Page 14: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuration register• Default setting – 0x2102 (remember this?)

– Loads IOS from flash – Loads startup-config from NVRAM

• Most common settings• 0x2142 –ignores contents of NVRAM/configuration• 0x2120 – The router into ROMmon mode

• http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml– **Go to Configuration Register Values & Their

Meaning.

Page 15: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router ConfigurationVerifying and troubleshooting bootup process:

• View output from the show version command

• Use dir flash: and boot flash: in ROMmon mode• View boot system commands [see miage below on next slide]

Page 16: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration (continued)

Page 17: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration (continued)

• Out-of-band management for initial configuration• In-band management over a network connection

In-Band Out-of-Band

HTTP or Telnet

Terminal emulation

Page 18: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration (continued)

• Command Line Interface (CLI): text-based program

• Can be used in both in-band or out-of-band

• Extensive help system [see image below on next slide]

Page 19: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial ISR Router Configuration (continued)

Page 20: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

SDM

• Security Device Manager (SDM): web-based GUI

• In-Band only• SDM Express (Basic) or Full package

(Advanced configuration)• Comes preinstalled in flash

Page 21: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

CLI vs. SDM

CLI SDM

User Interface Term Emulation software Web-based browser

Telnet

Configuration Method Text-based Cisco commands GUI buttons & text boxes

Expertise in Cisco Device Config.

Depends on the config task Do not need knowledge of CLI commands

Help Features Command-prompt based GUI based online help & tutorials

Flash Requirements Covered by IOS requirements 6MB of free memory

Availability ALL Cisco devices Cisco 830 series thru Cisco 7301

What It’s Used When device does not support SDM

Initial config of SDM equipped device

Page 22: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Using Cisco SDM Express and SDM

• Follow best practices for installing a new device to ensure correct functions

Page 23: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Using Cisco SDM Express and SDM

Eight SDM Express configuration screens:

• Overview• Basic configuration• LAN IP address• DHCP• Internet (WAN)• Firewall• Security settings• Summary

Page 24: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Using Cisco SDM Express and SDM

• Use Basic NAT Wizard to configure dynamic NAT with PAT

Page 25: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• CLI command modes: two levels of access

Page 26: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Configuration modes can alter the operation of the device

Page 27: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

Help features:• Command completion• Error indicators• Command history

– Enabled by default

– Records 10 command

– Max 256 commands

– history size command

• Arrow and function keys

Page 28: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Show commands display configuration and operation information

• R#show run• R#show interfaces• R#show ip route• R#show protocols

Page 29: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Use Cisco IOS CLI to perform an initial router configuration

Page 30: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Configure serial and Ethernet interfaces on a router

(DTE) Data Terminal Equipment endpoint of user’s device on the WAN link; Cisco routers

(DCE) Data Communications Equipment; provides clock rate; modem; converts data from router to acceptable format to cross the WAN

If back-to-back router scenario, one of the routers will be DCE and one DTE.

Page 31: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Configure a default route for the Cisco router

• Default route used when router does not know where to send a packet.

IP address of next-hop router

Or

port number

Page 32: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Configure a Cisco router to function as a DHCP server

Page 33: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Configure static NAT on a Cisco router to enable Internet access for an internal server

Page 34: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Back up and restore configuration files using a TFTP server

Page 35: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Configuring a Router Using IOS CLI

• Capture and save configuration file output from a terminal session

Page 36: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Connecting the CPE to the ISP• Customer Premise Equipment (CPE) – network devices installed

at customer location.• Configuration checklists ensure that all configuration

requirements are met

Page 37: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Connecting the CPE to the ISP • Use inventory and configuration checklists and

an installation plan to ensure successful installation

Page 38: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Connecting the CPE to the ISP

• Documentation includes diagrams, checklists, and activity logs

Page 39: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Connecting the CPE to the ISP

Types of customer connections over a WAN:• Point-to-point: often called leased lines;

typically most expensive; price based on bandwidth & distance between 2 points

• Circuit-switched – similar to a phone call made over a phone network; example is ISDN or dialup connection; physical circuit reserved from source to destination

• Packet-switched – each customer has a virtual circuit; example is Frame Relay

Page 40: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Customer Connections over WAN

• Bandwidth and cost influence WAN choices

Page 41: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Connecting the CPE to the ISP• Clock rate and serial encapsulation are needed when configuring serial

WAN connections

– Clock rate is set by DCE

– DTE accepts clock rate

• Leased WAN connections use serial connection & require Channel Service Unit/Data Service Unit (CSU/DSU

DCE

DTE

Page 42: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial Cisco 2960 Switch Configuration

• Fixed-configuration, standalone devices – does not use modules or flash card slots. Physical configuration can’t be changed.

• Layer 2 device that directs stream of message coming in from one port, our of another based on destination MAC address.

• Configured using GUI or CLI

Page 43: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Cisco 2960 switch

• Comes preconfigured

• Needs to be assigned basic security info

• Basic commands (ex: hostname, passwords) sames as ISR switch.

• Configure management IP address

• One virtual local area network, VLAN 1 is preconfigured to provide access to management functions.

Page 44: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial Cisco 2960 Switch Configuration

• Switch settings can be configured using the Cisco IOS CLI

• Assign an IP address to the default management virtual local area network, VLAN1

Page 45: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial Cisco 2960 Switch Configuration

• Check switch components• Connect cables to the switch• Power up the switch and observe POST

Page 46: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial Cisco 2960 Switch Configuration

• Connect the stand-alone LAN switch to the router and verify connectivity

• Configure port security to prevent unauthorized use

• Shut down unused ports

Page 47: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Switch port security

• Port security limits the # of MAC addresses allowed per port.• Set port to access mode using switchport mode access

command• 3 ways to configure port security:• Static – MAC addresses are manually assigned using

switchport port-security mac-address [mac-address] interface config command.

– S1# configure terminal– S1(config-if)#interface fastethernet 0/20– S1(config-if)#switchport mode access– S1(config-if)#switchport port-security mac-address

1000.2000.3000– S1(config-if)#end–

Page 48: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Switch port - contd

• Dynamic MAC addresses are dynamically learned & stored in address table

• # of addresses stored can be controlled; default is one address.

• If port is shut down or switch is restarted, address learned are cleared from the table

S1# configure terminal– S1(config-if)#interface fastethernet 0/20– S1(config-if)#switchport mode access– S1(config-if)#switchport port-security– S1(config-if)#end

Page 49: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Switch port - contd

• Sticky – similar to dynamic

• Addresses learned are saved to the running-config

– S1# configure terminal– S1(config-if)#interface fastethernet 0/20– S1(config-if)#switchport mode access– S1(config-if)#switchport port-security– S1(config-if)#switchport port-security maximum 50– S1(config-if)#switchport port-security mac-address sticky– S1(config-if)#end

Page 50: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Initial Cisco 2960 Switch Configuration

• Cisco Discovery Protocol (CDP) gathers information about directly-connected Cisco network devices

• Two Cisco devices directly connected on the same local network are called neighbors

Page 51: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

Summary• The Integrated Services Router (ISR) is a good

choice for small to medium businesses and ISP-managed customers.

• ISRs can be initially configured using SDM or the router IOS CLI.

• When using the CLI, “show” commands verify configuration elements.

• An installation plan can minimize disruption to a network when new devices are being added.

• Documentation is necessary, both when configuring and when installing network devices.

• Switches are assigned IP addresses by configuring them on the management interface, VLAN 1.

Page 52: Version 4.1 Configuring Network Devices Working at a Small-to-Medium Business or ISP – Chapter 5.

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