Modifying an ASN

You can modify an ASN on a 7210 SAS but the new ASN is not used until the BGP instance is restarted either by administratively disabling or enabling the BGP instance or by rebooting the system with the new configuration.

Because the ASN is defined in the config>router context, not in the BGP configuration context, the BGP instance is not aware of the change. Re-examine the plan detailing the autonomous systems, the SRs belonging to each group, group names, and peering connections. Changing an ASN on a 7210 SAS could cause configuration inconsistencies if associated peer-as values are not also modified as required. At the group and neighbor levels, BGP reestablishes the peer relationships with all peers in the group with the new ASN.

Use the following syntax to change an ASN.

config>router# autonomous-system autonomous-system

config>router# bgp
    group name
    neighbor ip-addr
            peer-as asn

Example

config>router# autonomous-system 400
    config>router# bgp
    config>router>bgp# group headquarters1
    config>router>bgp>group# neighbor 10.10.10.103
    config>router>bgp>group# peer-as 400
    config>router>bgp>group# exit