Identifying Neighbors and Defining Peer Groups

In internal BGP-4, the remote autonomous system number that is defined for the BGP-4 peer will be the same; in external BGP-4, these numbers will differ. The syntax is as follows:

neighbor ip-address | peer-group-name remote-as autonomous system number

The use of the peer-group-name allows the identification of this router as a member of a peer group.

A peer group is a group of neighbors that share the same update policy. This is the mechanism by which routers can be grouped to simplify configuration.

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