: If using loopback addresses for stability, you must specify the source interface. neighbor update-source loopback 0 4. Advertise Networks
Configure iBGP and eBGP with or without a Loopback Address - Cisco Configuring BGP on Cisco Routers - Lab Guide
Once basic connectivity is established, you can practice influencing path selection: : If using loopback addresses for stability, you
: 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) : bgp router-id
: Peers in different autonomous systems (e.g., R1 in AS 100 connecting to R2 in AS 200). neighbor remote-as iBGP (Same AS) : Peers within the same autonomous system. neighbor remote-as
Neighbors must be explicitly defined using their IP address and AS number.
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