Configuring Bgp On — Cisco Routers - Lab Guide

BGP requires a 32-bit unique identifier to establish peering sessions. While Cisco IOS can select this automatically from the highest IP on a loopback or physical interface, it is best practice to set it manually for stability. : bgp router-id

: If the network is not already in the routing table, you may need to add a static route to Null0 to "anchor" it. 5. Advanced Lab Tasks (Optional) Configuring BGP on Cisco Routers - Lab Guide

: If using loopback addresses for stability, you must specify the source interface. neighbor update-source loopback 0 4. Advertise Networks BGP requires a 32-bit unique identifier to establish