• Use the no version to remove an entry from the table.
• See neighbor remote-as
Configuring BGP Peer Groups
You will often want to apply the same policies to most or all of the peers of a particular
BGP speaker. Update policies are usually defined by route maps, filter lists, and distribution
lists. You can reduce the configuration effort by defining a peer group made up of these
peers.
A peer group is defined relative to a particular BGP speaker. Figure 11 on page 28 shows
two peer groups, eastcoast and leftcoast. Each of these peer groups is defined for router
Chicago, the hub router. Routers Boston, NY, and Miami have no knowledge of being
members of Router Chicago’s eastcoast peer group. Similarly, routers SanFran, LA, and
SanDiego have no knowledge of being members of router Chicago’s leftcoast peer group.
The following commands configure the eastcoast peer group on router Chicago:
host1(config)#router bgp 23
host1(config)#route-map wtset permit 10
host1(config-route-map)#set weight 25
host1(config-route-map)#exit
host1(config-router)#neighbor eastcoast peer-group
host1(config-router)#neighbor eastcoast route-map wtset in
host1(config-router)#neighbor 10.6.6.2 remote-as 12
host1(config-router)#neighbor 10.6.6.2 peer-group eastcoast
host1(config-router)#neighbor 10.7.3.2 remote-as 12
host1(config-router)#neighbor 10.7.3.2 peer-group eastcoast
host1(config-router)#neighbor 10.4.4.2 remote-as 12
host1(config-router)#neighbor 10.4.4.2 peer-group eastcoast
The following commands configure the leftcoast peer group on router Chicago:
host1(config-router)#neighbor leftcoast peer-group
host1(config-router)#neighbor 10.3.3.2 remote-as 78
host1(config-router)#neighbor 10.3.3.2 peer-group leftcoast
host1(config-router)#neighbor 10.3.2.2 remote-as 2143
host1(config-router)#neighbor 10.3.2.2 peer-group leftcoast
host1(config-router)#neighbor 10.3.1.2 remote-as 136
host1(config-router)#neighbor 10.3.1.2 peer-group leftcoast
The multiprotocol extensions to BGP enable the exchange of information within different
types of address families. By default, peers and peer groups exist in the unicast IPv4
address family and exchange unicast IPv4 addresses. For information on configuring and
activating BGP peer groups within address families, see “Configuring the Address Family”
on page 43.
27Copyright © 2010, Juniper Networks, Inc.
Chapter 1: Configuring BGP Routing
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