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BGP cluster ID

Posted on 2016-08-10
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Last Modified: 2016-08-12
Router
router bgp 64615
 no synchronization
 bgp router-id 10.74.50.244
bgp cluster-id 2887698805
 bgp log-neighbor-changes
 network 10.74.50.240 mask 255.255.255.252
 network 10.74.50.244 mask 255.255.255.255
 network 10.74.50.0 mask 255.255.255.0
 network 172.30.201.117 mask 255.255.255.255
 network 172.30.205.212 mask 255.255.255.252
 neighbor 172.30.205.214 remote-as 13321
 neighbor 172.30.205.214 description AT&T
 neighbor 172.30.205.214 route-map ADVERTISE_LOCAL_ONLY out


Router#show ip bgp ?
  A.B.C.D          IP prefix <network>/<length>, e.g., 35.0.0.0/8
  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.  
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Question by:PeraHoman
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1 Comment
 
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SIM50 earned 500 total points
ID: 41750892
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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