Multiple route reflectors should belong to the same cluster. By default, the value for the cluster-id command is the device ID. Use this procedure to change the device ID.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1000
device(config-bgp-router)# cluster-id 321
device# configure terminal device(config)# router bgp device(config-bgp-router)# local-as 1000 device(config-bgp-router)# cluster-id 321