Peers groups are used to simplify the BGP configuration for internal and external peers with the same characteristics. The peer group feature is not only used to simply and reduce BGP configuration on the router; it is also used to optimize BGP by improving convergence time. The primary advantages provided by using BGP peer groups are configuration reduction and the ability to replicate updates between BGP peers, with the former being the most common reason administrators choose to implement and use peer groups.
Without peer groups, for example, if a BGP speaker is configured with multiple iBGP peers and knows . . .
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