7. Redundant RRs

Usually, a cluster of clients will have a single RR. In that case, the cluster will be identified by the BGP Identifier of the RR. However, this represents a single point of failure so to make it possible to have multiple RRs in the same cluster, all RRs in the same cluster can be configured with a 4-byte CLUSTER_ID so that an RR can discard routes from other RRs in the same cluster.