BGP Neighbors associated in a Peer-Group share similar routing policies. Update policies are usually set by route maps, distribute-lists and filter-lists, etc. Instead of defining the same policies for each separate neighbor, we define a peer group name and assign these policies to the peer group.
Members of the peer group inherit all of the configuration options of the peer group. Members can also be configured to override these options if these options do not affect outbound updates; you can only override options set on the inbound.
NOTE: The members of a peer group may not necessarily be in a same autonomous system.
In this documentation, we are configuring IPv6 EBGP relationship by creating two peer groups on Router R1, named BOISE and MONTANA. Neighbors associated in group BOISE are R2 & R3 whereas R4 & R5 are associated with group MONTANA. For demonstration, we have configured two route-maps for each peer-group.
The command to attache peer-group with the route-map is neighbor peer-group-name route-map route-map-name out/in, the command is configured under the address-family mode.
All configurations are carried in Lab environment on Cisco 3745 Router operating on Cisco IOS 12.4 version.
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