Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

Page: 185 / 742

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
You must configure a cluster ID, because router Harvard and router Acton are both route
reflectors in this cluster.
bgp client-to-client reflection
•
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.
bgp cluster-id
•
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.
neighbor route-reflector-client
•
Use to configure the local router as the route reflector and the specified neighbor as
one of its clients. The reflector and its clients constitute a cluster. BGP neighbors that
are not specified as clients are nonclients.
•
Route reflectors pass routes among the client routers.
149 Copyright © 2010, Juniper Networks, Inc.
Chapter 1: Configuring BGP Routing