Filter
Top Products
Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-31
Cisco IOS XR Routing Configuration Guide
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.
Step 9
remote-as
autonomous-system-number
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as
2002
Creates a neighbor and assigns it a remote autonomous
system number of 2002.
Step 10
address-family {ipv4 unicast | ipv4 multicast |
ipv6 unicast | ipv6 multicast}
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr)#
address-family ipv4 unicast
Enters global address family configuration mode for the
IPv4 address family.
Step 11
route-policy
route-policy-name
{in | out}
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr-af)#
route-policy In-Ipv4 in
(Optional) Applies the In-Ipv4 policy to inbound IPv4
unicast routes.
Step 12
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