Juniper JUNOSE, Configuration Manual

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Use to add an entry to the BGP neighbor table.
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Specifying a neighbor with an AS number that matches the AS number specified
in the router bgp command identifies the neighbor as internal to the local AS.
Otherwise, the neighbor is treated as an external neighbor.
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If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command unless it is overridden for a specific peer.
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This command takes effect immediately.
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Use the no version to remove an entry from the table.
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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 27
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
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Configuring BGP Peer Groups
JUNOSe 11.0.x BGP and MPLS Configuration Guide