Configuring Multiple Bgp Instances For A Specific Autonomous System; Configuring A Routing Domain Confederation For Bgp - Cisco ASR 9000 Series Configuration Manual

Configuring Multiple BGP Instances for a Specific Autonomous System

Configuring Multiple BGP Instances for a Specific Autonomous System
Perform this task to configure multiple BGP instances for a specific autonomous system.
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. bgp router-id ip-address
4. commit
DETAILED STEPS
Command or Action
Step 1
configure
Step 2 router bgp as-number [instance instance name]
Example:
RP/0/RSP0/CPU0:router(config)# router bgp 100
instance inst1
Step 3 bgp router-id ip-address
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp router-id
10.0.0.0
Step 4
commit

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.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
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Purpose
Enters BGP configuration mode for the user specified
BGP instance.
Configures a fixed router ID for the BGP-speaking router
(BGP instance).
You must manually configure unique router ID
Note
for each BGP instance.
Implementing BGP
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