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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-47
Cisco IOS XR Routing Configuration Guide
OL-14356-01
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. end
or
commit
Step 13
route-policy route-policy-name {in | out}
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr-af)#
route-policy drop-as-1234 in
(Optional) Applies the specified policy to inbound IPv4
unicast routes.
Step 14
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# end
or
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
–
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
–
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
–
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Command or Action Purpose