Cisco ASR 9000 Series Configuration Guide

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
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
Configures a fixed router ID for the BGP-speaking router
(BGP instance).
bgp router-id ip-address
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp router-id
10.0.0.0
Step 3
You must manually configure unique router ID
for each BGP instance.
Note
commit
Step 4
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
78 OL-30423-03
Implementing BGP
Configuring Multiple BGP Instances for a Specific Autonomous System

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model