Networking Features

Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features 1

Networking Features

Upon completion of this module, you should be able to:• Discuss and configure VNX networking features


Networking Features

During this lesson the following topics are covered:• Basic network concepts and terminology• VLANs and VLAN tagging• Roles of networking features• Types of virtual devices• Physical, virtual and logical interfaces on a Data Mover

Lesson 1: Networking Features Overview


Networking Devices Overview• Ethernet hub (EMC recommends no hubs in VNX environment)

Layer 1 All traffic sent to all ports Half duplex mode only

• Ethernet switch Layer 2 Sends traffic to specific port 100Mbps+/Full duplex support

• Managed Ethernet switch Allow control and traffic management Includes features such as Ethernet Channel, LACP and VLANs Can operate at Layer 3

• Infrastructure must support VNX feature

Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features

Virtual Local Area Network (VLANs)• Groupings of switch ports

Divides large number of ports Confines broadcasts Contributes to security

Can combine physically separate LANs• A VNX Physical device may be required to participate in multiple

network segments VLAN Tagging

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Click icon to add picture• Top diagram illustrates a “public network”

• Bottom diagram illustrates three “private networks”

• Physical location is not relevant to VLAN number

• VLAN numbers are defined by the local administrator

• InterVLAN traffic must be routed

VLANs

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VLAN Tagging• A single network interface card can be assigned multiple logical

interfacesDifferent VLAN can be assigned to each interfaceDestination IP address must match the interface IP addressThe packet's VLAN tag must match the interface's VLAN ID

• Zero (or blank) is the default value of VLAN ID Packets are sent without tags (default value)

• VLAN Tag (ID)Written by device that transmits the frame

• Switch port settingsType trunkProtocol setting 802.1Q

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Click icon to add picture• Protocol 802.1Q• Individual Ethernet

switch port is classified as a trunk port

• Administrator must allow specific VLANs to use the trunk port

• VLAN tagging is seen in many enterprise networking environments

VLAN Tagging (continued)

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Roles of Networking Features• High Availability:

Ethernet Channel Link aggregation Fail-Safe Network

• Increase Network Flexibility: VLAN Tagging

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Virtual Device Overview and Usage• Virtual device is a combination of multiple physical devices

defined by a single MAC address.• You cannot individually assign same IP address to different

physical devices on a Data Mover Duplicate IP Different MAC addresses

• Virtual devices are used to distribute data among multiple physical ports in case of failure

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Types of VNX Virtual Devices• Ethernet Channel

Dependent on pre-existing Ethernet configuration (customer must provide)

• Link Aggregation Dependent on pre-existing Ethernet configuration (customer must

provide)• Fail Safe Network

Independent of pre-existing Ethernet configuration Should be configured across two Ethernet switches

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Ethernet Channel and LACP• Ethernet Channel

Static configuration No support for Port Aggregation Protocol (PAgP) Works with Cisco EtherChannel

• Link Aggregation (LACP) Industry standard (802.3ad) alternative to EtherChannel

• Both provide more overall bandwidth than a single port Connection to any single client runs through one physical port, and

is therefore limited by the port’s bandwidth• When the connection to one port fails, the switch automatically

switches traffic to the remaining ports

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Ethernet Channel and LACP Comparison

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Feature Ethernet Channel Link AggregationSwitch Support

Switch must use IEEE standard, Fast or Gig Ethernet

Switch must support IEEE 802.3ad Link Aggregation

Link Speeds Allows links of different speeds Disables links with a different speed than the majority

Duplex Full or half Full

Number of Ports 2, 4, or 8 2 - 12

Availability

Broken links are physically marked as “up” on the Data Mover, but the switch will detect the down link and redirect traffic to the Data Mover down other links

Better link control: LACPDU frames are transmitted on each link in the aggregation to ensure they are not broken

Misconfiguration Protection

Misconfigured links difficult to detect

Detects misconfigured links and marks them as down


VNX Use of Statistical Load Distribution• Applies for Ethernet Channels and Link Aggregation devices• Three methods of statistical load distribution

MAC address IP address (default) IP address and TCP port

• Port Failure Traffic redirect to live port

• Incoming and outgoing traffic ports may differ

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Fail Safe Network• Extends link failover by providing switch-level redundancy• A FSN appears as a single link with a single MAC address, and

potentially multiple IP addresses• A FSN is comprised of a physical port, Ethernet Channel, Link

Aggregation or any combination of the three• Only one connection in a FSN is active at a time• There is no requirement that the connections making up a FSN

be the same type, or that the connections be made to the same network switch

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Cross-Stack EtherChannel

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Switch 1

Switch 2

Switch 3

Cross-Stack SwitchesStack A

Cross-Stack EtherChannel

Copyright © 2014 EMC Corporation. All Rights Reserved.

Networking Features

During this lesson the following topics were covered:• Basic network concepts and terminology• VLANs and VLAN tagging• Roles of networking features• Types of virtual devices• Physical, virtual and logical interfaces on a Data Mover

Lesson 1: Summary

Networking Features 16


Networking Features

During this lesson the following topics are covered:• Creating an Ethernet Channel device• Creating a LACP device• Creating a FSN device• Creating VLAN IDs on an interface

Lesson 2: Networking Features Configuration


VNX Network Terminology Review• Physical Device (device name)

The actual ports on the Data Mover (e.g., cge-1-0, fge-2-3) Not a variable

• Virtual Device (device name) User assigned variable name Combination of multiple physical devices

• Logical Interface (interface name) User/System assigned variable name Assigned an IP address

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Click icon to add picture• The physical port on a Data Mover cge = Copper Gigabit Ethernet fge = Optical Gigabit Ethernet fxg = Optical 10 Gigabit Ethernet

• Not a variable• Can support multiple interfaces/IP

addresses with VLAN Tagging• 10/100/1000 Mbps or 10 Gbps• Half/Full/Auto

Physical Device (device name)

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• No virtual devices in this configuration

• An interface name is created and an IP address is assigned using a physical copper Gigabit Ethernet port on a primary Data Mover

• Other IP addresses can be created on the same physical interface Interface name must differ VLAN Tagging may be required

Physical - Logical (device – interface)

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• Two physical devices (cge-1-0 and cge-1-1) are used to create a virtual device lacp0 using the LACP Protocol

• An IP address is assigned using the virtual device lacp0

• Other IP address can be created on the same virtual interface interface name must differ VLAN Tagging

Physical - Virtual - Logical

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• Cannot use physical devices that have previously been used They will not be displayed

• Standby Data Mover(s) will inherit configuration Ethernet switch should be setup

in advance (required for Ethernet Channel and Link Aggregation)

• Primary Variables Data Mover Type

Ethernet Channel Link Aggregation Fail Safe Network

Device Name User must configure

Creating a Virtual Device

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Settings > Network > Settings for File > Devices > Create


• Settings > Network > Settings for File > Devices (tab) > Create

• Select Data Mover• Select Ethernet Channel• Enter Device Name• Select Ports• Select Speed/Duplex

Should be set to match Ethernet switch settings

Creating an Ethernet Channel Virtual Device

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From Device tab



• Select Data Mover• Select Link Aggregation• Enter Device Name• Select ports• Select Speed/Duplex

Should be set to match Ethernet switch settings

Note: cge-1-0 and cge-1-1 are not listed because they are already in use

Creating a Link Aggregation Virtual Device

From Device tab



• Select Data Mover• Select Fail Safe Network • Enter Device Name• Select Devices

Primary (optional) Standby

• Can combine Dissimilar Ethernet devices Virtual and physical devices

Creating a FSN Virtual Device

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From Device tab


Click icon to add picture• Primary should be used if members are not equal The primary is a better data

path More reliable Faster

Optional

• Standby Will support failed link Will not fail back when primary

failure is corrected

FSN Role of Primary and Standby

From Device tab


Click icon to add picture• IP address are assigned to Virtual devices same as Physical devices

• Physical devices used by Virtual devices will not be selectable

• Auto calculating Broadcast Address• Default optional values

Name: The IP address with the value “-” replacing “.” 10.0.0.1 would be 10-0-0-1

MTU: 1500 VLAN ID: 0

Creating a Data Mover Interface

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Click icon to add picture• Settings > Network > Settings for File > Devices

• Right-click on device and select properties for more detail Adjust speed and duplex

Managing Virtual Devices

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Click icon to add picture• Settings → Network → Settings for File → Devices Select item for removal; right

click > select delete, or click on delete button

• Can only delete one virtual device at a time

• Cannot delete devices that have dependencies In use by CIFS server In use by another virtual device Virtual devices must be deleted in

the reverse order from how they were created

Deleting Virtual Devices

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Networking Features

During this lesson the following topics were covered:• Creating an Ethernet Channel device• Creating a LACP device• Creating a FSN device• Creating VLAN IDs on an interface

Lesson 2: Summary



Networking Features

During this lesson the following topics are covered:• Network features to support a complex environment• VNX and Ethernet switch requirements• Active data paths in case of failure• Networking high availability considerations

Lesson 3: Complex Examples and Considerations

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• Two physical devices (cge-1-0 and cge-1-1) are used to create a virtual device “lacp0” on a Data Mover

• Two physical devices (cge-1-2 and cge-1-3) are used to create another virtual device “lacp1” on a Data Mover

• Both Virtual devices (lacp0,lacp1) are used to create another Virtual device “fsn0”

• An IP address is assigned using the virtual device fsn0

VNX Configuration

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lacp0

lacp1

fsn0

10.127.57.233


Click icon to add picture• If connection to a single network segment is not enough, use VLAN Tagging

• IP addresses are on different network segments (different VLANs)

• VLAN value provided by Ethernet switch administrator

• Set VLAN ID to match Ethernet switch value

Example: If fsn0 uses all ports and customer needs to connect to multiple network segments, VLAN Tagging should be used

Optional: Creating Multiple Logical Interfaces

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fsn0

Ethernet Switch Configuration

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lacp0=cge-1-0,cge-1-1 (primary)

Switch

Network

lacp1=cge-1-2,cge-1-3 (secondary)

Switch


Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Active

cge-1-1 Active

cge-1-2 lacp

1

Standby

cge-1-3

Standby

Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Off-line

cge-1-1 Active

cge-1-2 lacp

1

Standby

cge-1-3

Standby

Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Off-line

cge-1-1

Off-line

cge-1-2 lacp

1Active

cge-1-3 Active

Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Off-line

cge-1-1

Off-line

cge-1-2 lacp

1

Off-line

cge-1-3 Active

Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Standby

cge-1-1

Standby

cge-1-2 lacp

1Active

cge-1-3 Active

Device

Virtual Device

Status

cge-1-0 lacp

0

fsn0

Active

cge-1-1 Active

cge-1-2 lacp

1

Standby

cge-1-3

Standby

Example: Active Data Path

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Phase 1: Normal Operation

Phase 2: Port failure

Phase 3: Port failures

Phase 4: Port failures

Phase 5: Failure resolved (no primary)

Phase 5: Failure resolved (primary=lacp0)


Speed and Duplex Considerations• VNX speed and duplex setting must match Ethernet switch• Failure to address has negative results

Failure to connect Performance problems

• Creation of an Ethernet Channel or Link Aggregation device requires user to set speed and duplex (default = 1000 FD)

• An FSN device inherits speed and duplex currently configured on member devices

See Basic Network Configuration module for more information

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Data Mover Failover Network Considerations • Failed network connections do not trigger Data Mover failover

Data Mover is operating normally, network is not• Standby Data Mover requires identical configuration

Any Ethernet Channels or Link Aggregation devices require same configuration on Ethernet switch

Any trunk ports used with VLAN tagging require same configuration on Ethernet switch

• Test configuration when deploying configuration Incorrect configuration for standby Data Mover could cause service

interruption in failover situation

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Confirming the Ethernet Switch• Confirm channels have been created (if required)

Cisco EtherChannel LACP Typical for EMC personnel not to have access to Ethernet Switch

devices Dependency on customer to provide information

• Confirm trunk ports have been created (if required)• Commands used to create channels are issued on the VNX AND

Ethernet Switch

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LACP Considerations• A LACP link can be created with any number of physical devices• Only Full Duplex Ethernet ports can be used to create the link

If a mixture of port speeds is given, the Data Mover will choose the greatest number of ports at the same speed

In case of a tie, the fastest ports are chosen • Although multiple links are joined, no one client will gain an

advantage from this configuration with regards to network speed or throughput Link determined by source/destination IP address Can also load balance based on source/destination MAC address

or source/destination IP address AND source/destination TCP/UDP ports

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Networking Features

During this lesson the following topics were covered:• Network features to support a complex environment• VNX and Ethernet switch requirements• Active data paths in case of failure• Networking high availability considerations

Lesson 3: Summary



SummaryKey points covered in this module:

• Virtual network devices extend fault tolerance into the network by providing port redundancy

• FSN protects against switch failures

• High Availability solution need to include aligned switch port configurations for Primary and Standby Data Movers

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Networking Features

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