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BGP cluster ID

router bgp 64615
 no synchronization
 bgp router-id
bgp cluster-id 2887698805
 bgp log-neighbor-changes
 network mask
 network mask
 network mask
 network mask
 network mask
 neighbor remote-as 13321
 neighbor description AT&T
 neighbor route-map ADVERTISE_LOCAL_ONLY out

Router#show ip bgp ?
  A.B.C.D          IP prefix <network>/<length>, e.g.,
  A.B.C.D          Network in the BGP routing table to display
  cidr-only        Display only routes with non-natural netmasks
  community        Display routes matching the communities
  community-list   Display routes matching the community-list
  dampened-paths   Display paths suppressed due to dampening
  filter-list      Display routes conforming to the filter-list
  flap-statistics  Display flap statistics of routes
  inconsistent-as  Display only routes with inconsistent origin ASs
  ipv4             Address family

I have a cluster-id configured.  I think it may be legacy.  When I do a show ip bgp ? - cluster-id is not present.  

How can I verify if the cluster-id is still being used or not being used, and why is this still here?  Isn't the command "neighbor 10.x.x.x cluster-id x.x.x.x" needed?  There is no "neighbor 10.x.x.x cluster-id x.x.x.x" under the show run.  
1 Solution
Cluster ID is used to prevent loops with route reflectors if you have more than one route reflector in the group. RR will not accept routing updates from another RR with the same cluster ID.  If you don't user RR's, I believe it should be safe to remove that command.
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