Configure a BGP4 Confederation

A BGP4 confederation consists of multiple sub-autonomous systems.

1. Access global configuration mode.
   

   device# configure terminal

2. Access BGP configuration mode.
   

   device(config)# router bgp

3. Identify the sub-autonomous system (sub-AS) in which your device resides.
   

   device(config-bgp-router)# local-as 65520

4. Assign an ASN as a BGP confederation identifier.
   

   device(config-bgp-router)# confederation identifier 100

   Sub-AS 65520 is now part of a confederation that belongs to autonomous system 100.
5. Specify the ASNs of all BGP peers that you want to add to the confederation.
   

   device(config-bgp-router)# confederation peers 65520 65521 65522

Example

The following example summarizes the commands in this procedure.

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 65520
device(config-bgp-router)# confederation identifier 100
device(config-bgp-router)# confederation peers 65520 65521 65522