Route-reflector clients advertise routes to the route reflector. The route reflector, in turn, reflects the advertisements to other route-reflector clients.
A BGP device can act as a route-reflector client or as a route reflector. Run the neighbor route-reflector-client command on a host device to configure a neighbor to be a route-reflector client. The host then becomes as the route reflector.
Multiple route reflectors should belong to the same cluster. By default, the value for cluster-id is used as the device ID. The device ID can be changed using the cluster-id command.
The route reflector reflects routes as follows:
If route-reflector clients are connected in a full iBGP mesh, you can disable client-to-client reflection on the route reflector using the no client-to-client-reflection command.
A BGP device advertises only routes that are preferred and installed into the Routing Table Manager (RTM). The route reflector may not reflect routes that are not installed into the RTM because the routing table is full. You can use the always-propagate command to configure the route reflector to reflect routes that are not in the RTM.