Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 188

JUNOSe 11.1.x BGP and MPLS Configuration Guide
You must configure a cluster ID, because router Acton and router Harvard are both
route reflectors in this cluster.
To configure router Harvard as a route reflector:
You must configure a cluster ID, because router Harvard and router Acton are both
route reflectors in this cluster.
bgp client-to-client reflection
bgp cluster-id
neighbor route-reflector-client
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Managing a Large-Scale AS
host4(config)#router bgp 29
host4(config)#bgp cluster-id 23
host4(config-router)#neighbor 10.3.1.2 remote-as 29
host4(config-router)#neighbor 10.3.1.2 route-reflector-client
host4(config-router)#neighbor 10.1.2.1 remote-as 29
host4(config-router)#neighbor 10.1.2.1 route-reflector-client
host4(config-router)#neighbor 10.3.3.2 remote-as 29
host4(config-router)#neighbor 10.2.5.2 remote-as 29
Use to reenable the reflector to reflect routes among all clients.
Client-to-client reflection is enabled by default. If the route reflector's clients are
fully meshed, you can disable reflection because it is not necessary.
If client-to-client reflection is enabled (the default), clients of a route reflector
cannot be members of a peer group.
Example
host1(config-router)#no bgp client-to-client reflection
Changes apply automatically to any routes received after you issue the command.
To advertise or withdraw routes that are already present in the BGP routing table,
you must use the clear ip bgp command to issue a hard clear or an outbound
soft clear.
Use the no version to disable route reflection; use only if the route reflector's
clients are fully meshed.
See bgp client-to-client reflection.
Use to configure a cluster ID on the route reflectors if the BGP cluster has more
than one route reflector. For clusters with a single reflector, the cluster ID is the
reflector's router ID and does not have to be configured.
You specify a cluster ID number or an IP address of a router acting as a route
reflector.
The new cluster ID is used in update messages sent after you issue the command.
To force BGP to resend all routes with the new cluster ID, you must use the clear
ip bgp command to perform a hard clear or a soft clear.
Use the no version to cause BGP to use the router ID as the cluster ID.
See bgp cluster-id.