Cisco IOS in a Nutshell, 2nd Edition

Name

neighbor peer-group — router, BGP

Synopsis

neighbor address peer-group peer-group
no neighbor address peer-group peer-group

Configures

Assigns a neighbor to a peer group

Default

None

Description

When configuring BGP, you often want to apply the same set of configuration items to a number of BGP neighbors. Peer groups let you simplify the router configuration by making a neighbor a peer group member. Once you have created a peer group, all configuration items for that group apply to all the members of the group. address is the IP address of the neighbor to be added to the peer group; peer-group is the name of the peer group.

Example

In this example, we create a peer group called group1 and place all our neighbors into this peer group (179.69.232.53, 54, and 55). Having created the peer group, we can apply neighbor filter-list commands to the group as a whole, rather than to the individual neighbors. We still have to configure the unique features (such as remote AS numbers) of the neighbors individually.

router bgp 200
 neighbor group1 peer-group
 neighbor group1 filter-list 100 in
 neighbor group1 filter-list 102 out
 neighbor 171.69.232.53 remote-as 300
 neighbor 171.69.232.53 peer-group group1
 neighbor 171.69.232.54 remote-as 400
 neighbor 171.69.232.54 peer-group group1
 neighbor 171.69.232.55 remote-as 500
 neighbor 171.69.232.55 peer-group group1