The major benefit of BGP peer groups is a reduction of resources (CPU load and memory) required in update generation. Peer groups also simplify BGP configuration.
With BGP peer groups, the routing table is walked only once per peer group, and updates are replicated to all other peer-group members that are in sync. Depending on the number of members, the number of prefixes in the table, and the number of prefixes advertised, this could significantly reduce the load. Thus, it is highly recommended that peers with identical outbound announcement policies be grouped into peer groups.
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