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From router Mason’s perspective, router Boston is simply a member of AS 29:

host4(config)#router bgp 413

host4(config-router)#neighbor 10.3.3.2 remote-as 29

bgp confederation identifier

• Use to establish a router as a member of the specified BGP confederation.

• To routers outside the confederation, the confederation appears as an autonomous

system with an AS number the same as the confederation identifier.

• The new confederation identifier is used in open messages and in the AS path in update

messages that are sent after you issue the command.

To force sessions that are already up to use the new confederation identifier, you must

use the clear ip bgp command to perform a hard clear.

• Use the no version to remove the sub-AS from the confederation.

• See bgp confederation identifier.

bgp confederation peers

• Use to enable EBGP sessions with routers in the peer sub-ASs; the EBGP sessions

preserve local-pref, MED, and next-hop attributes.

• You can specify one or more individual sub-AS numbers, or you can issue the filter-list

keyword and an AS-path access list (which is based on regular expressions) to specify

a list of sub-AS numbers.

• If the remote AS of a peer appears in the specified list of sub-ASs or is identified by the

filter list, then the peer is treated as being in the same confederation.

• This command takes effect immediately and bounces only those sessions whose peer

type changed as a result of issuing the command.

• Use the no version to remove individually specified sub-ASs, all sub-ASs specified by

the filter list, or all sub-ASs from the confederation.

• See bgp confederation peers.

ip bgp-confed-as-set new-format

• Use to specify that AS-confed-sets are displayed enclosed within square brackets

rather than parentheses, and that the AS paths in the set are delimited by commas

rather than spaces.

• Example

host1(config)#ip bgp-confed-as-set new-format

• Use the no version to restore the default display within parentheses and with

space-delimited ASs.

• See ip bgp-confed-as-set new-format.

JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

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