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bgp confederation identifier
Creates a BGP confederation identifier.
Syntax: [no] bgp confederation identifier as-sys
as-sys
Number of the autonomous system that internally includes multiple sub-autonomous systems (a confederation). Valid values are integers from 1 to 65535.
Description: BGP confederations allow you to break an autonomous system into multiple sub-autonomous systems, and then to group the sub-autonomous systems as a confederation.
The sub-autonomous systems exchange routing information as if they are IBGP peers. Specifically, routing updates between sub-autonomous systems include the next-hop, local-preference and MED attributes.
To routers outside the autonomous system, the confederation of sub-autonomous systems looks like a single autonomous system.
Use the bgp confederation identifier command to identify the autonomous system this confederation belongs to.
Use the no confederation identifier command to remove the confederation identifier.
Factory Default: No confederation is configured.
Command Mode: Router configuration.
Example: In the following example:
- The router bgp command enables BGP and configures the router in sub-autonomous system 65010.
- The bgp confederation identifier command specifies confederation 65010 belongs to autonomous system 42.
- The bgp confederation peers command specifies 4 other confederations as members of autonomous system 42.
- The neighbor remote-as command configures 2 neighbors. Both neighbors are in different confederations within the same autonomous system.
router(config)#router bgp 65010
router(config-router)#bgp confederation identifier 42
router(config-router)#bgp confederation peers 65011 65020 65030 65040
router(config-router)#neighbor 10.5.1.123 remote-as 65020
router(config-router)#neighbor 10.22.4.234 remote-as 65030
To routers outside your routing confederation, all of these routers appear to belong to a single autonomous system 42.
Related Commands: bgp confederation peers
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Avici Systems Inc.
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Source
File Name: BGP_Nd.fm
HTML File Name: BGP_Nd6.html
Last Updated: 05/10/04 at 16:36:55