This command has no arguments.
Purpose: When a router is configured as a route reflector, client-to-client reflection is enabled by default. If the route reflector's clients are fully meshed, client-to-client reflection can be disabled on the route reflector using the no form of the command.
Cisco IOS Software Release: 11.1
An obvious question is why use a route reflector if the clients have a full IBGP mesh? If client-to-client reflection is enabled, the clients cannot be part of a peer group. Figure 3-5 demonstrates a situation in which we want to scale the IBGP connections using route reflectors, but we also want Routers A, B, and ...