Due to the Border Gateway Protocol (BGP) not propagating any internal BGP (iBGP) learned routes to another iBGP peer, a full iBGP mesh should be maintained within the Autonomous System (AS).
To resolve this issue configure the BGP router to be a route reflector.
By configuring a BGP router to be a route reflector, a full mesh is no longer required. To configure a BGP router to be a route reflector, issue the neighbor route-reflector-client command.
For more information, refer to the Route Reflectors section of BGP Case Studies.
iBGP using route reflectors
All routes / All routes from specific neighbor
Valid route to next hop exists
State is established