BGP announce internal routes IBGP to IBGP

Make a router pass routes learned from one iBGP peer on to another iBGP peer.

Updated 2026-11-12Sami Ait Ali Oulahcen

IBGP assumes a full mesh by default, so it does not pass on routes learned FROM an IBGP peer TO another IBGP peer.
To do this, on your router, issue the command

neighbor B.B.B.B route-reflector-client

Where B.B.B.B is the IP address of the router that needs to learn the routes.

Source: https://community.cisco.com/t5/other-network-architecture-subjects/how-to-advertise-the-ibgp-learned-routes-to-another-ibgp-peer/td-p/312277