Instead of establishing an IBGP peering with each and every router of the internal BGP mesh, routers establish IBGP sessions with route reflectors only, resulting scalibility and easy add/remove router from IGP It is strongly recommended that you implement a backup RR for redundancy in case the primary fails, thereby increasing the reliability of your network. With two RRs in one cluster, each should be configured with a cluster ID, which will allow them to recognize updates and discard routes from each other.