All configuration changes for a single BGP instance can be committed together. However, configuration
changes for multiple instances cannot be committed together.
SUMMARY STEPS
1.
configure
2.
router bgp as-number [instance instance name]
3.
commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enters BGP configuration mode for the user
specified BGP instance.
router bgp as-number [instance instance name]
Example:
RP/0/RSP0/CPU0:router(config)# router bgp 100 instance
inst1
Step 2
commit
Step 3
Configuring a Routing Domain Confederation for BGP
Perform this task to configure the routing domain confederation for BGP. This includes specifying a
confederation identifier and autonomous systems that belong to the confederation.
Configuring a routing domain confederation reduces the internal BGP (iBGP) mesh by dividing an autonomous
system into multiple autonomous systems and grouping them into a single confederation. Each autonomous
system is fully meshed within itself and has a few connections to another autonomous system in the same
confederation. The confederation maintains the next hop and local preference information, and that allows
you to retain a single Interior Gateway Protocol (IGP) for all autonomous systems. To the outside world, the
confederation looks like a single autonomous system.
SUMMARY STEPS
1.
configure
2.
router bgp as-number
3.
bgp confederation identifier as-number
4.
bgp confederation peers as-number
5.
commit
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
82
Implementing BGP
Configuring a Routing Domain Confederation for BGP
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