BGP4+ Route Reflection

A BGP device can act as a route-reflector client or as a route reflector.

You use the neighbor route-reflector-client command to configure a BGP peer as a route-reflector client from the device that is going to reflect the routes (the route reflector).

Multiple route reflectors should belong to the same cluster. You can use the cluster-id command to change the device ID.

The route-reflector client reflects the routes as follows:

• Routes from the client are reflected to the client and to non-client peers.
• Routes from non-client peers are reflected only to client peers.

If route-reflector clients are connected in a full IBGP mesh, you can use the no client-to-client-reflection command to disable client-to-client reflection on the route reflector

A BGP device advertises only preferred routes that are installed in the Routing Table Manager (RTM). When a route cannot be installed in the RTM because the routing table is full, the route reflector may not reflect that route. You can use the always-propagate command to configure the route reflector to reflect routes that are not in the RTM.