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Configuring a Local AS

You can change the local AS of a BGP peer or peer group within the current address family with the neighbor local-as command. By using different local AS numbers for different peers, you can avoid or postpone AS renumbering in the event the ASs are merged.

neighbor local-as

Use to assign a local AS to the given BGP peer or peer group.
If you specify a BGP peer group by using the peerGroupName argument, all the members of the peer group inherit the characteristic configured with this command unless it is overridden for a specific peer.
This command takes effect immediately and automatically bounces the BGP session.
Use the no version for an individual peer to restore the value set for the peer group, if present, or set globally for BGP with the router bgp command. Use the no version for a peer group to restore the value set globally for BGP.
See neighbor local-as.

The following example commands change the local AS number for peer 104.4.2 from the global local AS of 100 to 32:



host1(config)#router bgp 100 

host1(config-router)#address-family ipv4 unicast
vrf boston 

host1(config-router)#neighbor 10.4.4.2 remote-as
645 

host1(config-router)#neighbor 10.4.4.2 local-as
32

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