BGP route-reflector-client

BGP requires that all internal BGP speakers are fully meshed. To reduce the size of the mesh, BGP speakers can be configure as route reflectors. Route reflectors pass internal learned routes to a set of internal BGP neighbors. When route reflectors clients are configured, the route-reflector is responsible for distributing internal BGP routes to other internal BGP neighbors.
Use the neighbor route-reflector-client command to identify the

Following is an example,

Here Hub router is configured as Multipoint and having two spokes R2 & R4. Where R2 is connecting with R6 and establishing EBGP peer relationship. In order to advertise routes originated by R2 to other peer as R3, the Hub router is reflecter and R2 is configured as Route-reflector-client.

HUB#show run s bgp

router bgp 200
no synchronization
bgp cluster-id 11.11.11.11
bgp log-neighbor-changes
neighbor 172.16.13.3 remote-as 200
neighbor 172.16.13.3 route-reflector-client
neighbor 172.16.124.2 remote-as 200
neighbor 172.16.124.2 route-reflector-client
neighbor 172.16.124.4 remote-as 200
no auto-summary