Enable ASN Capability Globally for BGP4

You can configure 4-byte autonomous system number (ASN) capability at the BGP4 global level.

1. Access global configuration mode.
   

   device# configure terminal

2. Access BGP configuration mode.
   

   device(config)# router bgp

3. Enable 4-byte ASN capability.
   

   device(config-bgp-router)# capability as4-enable