863
Configuring IP Unicast Routing
Configuring BGP
35
10.0.33.35 from 10.0.33.35 (192.168.3.3)
Origin incomplete, metric 10, localpref 100, valid, external
Community: 1:1
Local
0.0.0.0 from 0.0.0.0 (10.0.33.34)
Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best
Configuring BGP Neighbors and Peer Groups
Often many BGP neighbors are configured with the same update policies (that is, the same outbound route maps,
distribute lists, filter lists, update source, and so on). Neighbors with the same update policies can be grouped into peer
groups to simplify configuration and to make updating more efficient. When you have configured many peers, we
recommend this approach.
To configure a BGP peer group, you create the peer group, assign options to the peer group, and add neighbors as peer
group members. You configure the peer group by using the neighbor router configuration commands. By default, peer
group members inherit all the configuration options of the peer group, including the remote-as (if configured), version,
update-source, out-route-map, out-filter-list, out-dist-list, minimum-advertisement-interval, and next-hop-self. All
peer group members also inherit changes made to the peer group. Members can also be configured to override the
options that do not affect outbound updates.
To assign configuration options to an individual neighbor, specify any of these router configuration commands by using
the neighbor IP address. To assign the options to a peer group, specify any of the commands by using the peer group
name. You can disable a BGP peer or peer group without removing all the configuration information by using the neighbor
shutdown router configuration command.
BEFORE YOU BEGIN
Enable BGP routing as described in the Enabling BGP Routing, page 850.
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