DXS-3600-32S User Manual

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DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide

7-14 bgp confederation identifier

This command is used to specify the BGP confederation identifier. Use the no form of this command to remove the

confederation identifier.

bgp confederation identifier AS-NUMBER

no bgp confederation identifier

Parameters

7-15 bgp confederation peers

This command is used to add BGP confederation peers. Use the no form of this command to delete the confederation

peers.

bgp confederation peers ASPATH-LIST

no bgp confederation peers ASPATH-LIST

Parameters

AS-NUMBER Specifies the Autonomous System number, used to specify the BGP confederation.

This value must be between 1 and 4294967295. The AS TRANS value is 23456.

Default

None.

Command Mode

Router Configuration Mode.

Command Default Level

Level: 8. (EI Mode Only Command)

Usage Guideline

A confederation can be used to reduce the internal BGP (iBGP) mesh by dividing a

large single AS into multiple subs-ASs. External peers interact with the

confederation as if it is a single AS.

Each subs-AS is fully meshed within itself and it has connections to other sub-ASs

within the confederation. The next-hop, Multi Exit Discriminator (MED), and local

preference information is preserved throughout the confederation, allowing users to

retain a single Interior Gateway Protocol (IGP) for all the autonomous systems.

Use the show ip bgp confederation command to verify your settings.

Example

This example shows how to create a confederation in which the AS number is 20.

DXS-3600-32S#configure terminal

DXS-3600-32S(config)#router bgp 100

DXS-3600-32S(config-router)#bgp confederation identifier 20

DXS-3600-32S(config-router)#

ASPATH-LIST Specifies one or multiple AS number partitions, separated by a comma. This value

must be between 1 and 4294967295, however, for the AS TRANS, this value must

be 23456. This parameter specifies Autonomous System numbers for BGP peers

that will belong to the confederation.