The reflector cluster-id command sets a cluster ID for an RR.
The undo reflector cluster-id command restores the default setting.
By default, each RR uses its Router ID as the cluster ID.
Usage Scenario
Normally, a cluster has only one RR. The router ID of an RR identifies the cluster to which the RR belongs.
Configuring multiple RRs in a cluster can enhance the stability of the network. If a cluster has more than one RR, the reflector cluster-id command needs to be used to set the same cluster ID for the RRs. This avoids routing loops.