When you have multiple route reflectors, change the cluster ID so that all route reflectors belong to the same cluster.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1000
device(config-bgp-router)# cluster-id 321
The following example summarizes the commands in this procedure.
device# configure terminal device(config)# router bgp device(config-bgp-router)# local-as 1000 device(config-bgp-router)# cluster-id 321