BGP NEIGHBORS
Routing protocols need to know about their neighbors, and how to exchange hellos and routing information with them. BGP is no exception, and this protocol also must consider factors beyond a hop count or a link metric. BGP must also deal with policy-based routing, since BGP may entail the transmission of traffic between different (and potentially competitive enterprises). Therefore, BGP's neighbors are very important, because they may be external neighbors, those belonging to another autonomous system and another enterprise.
From the technical standpoint, BGP supports two kinds of neighbors. The internal neighbor is in the same autonomous system, and the external neighbor is in a different autonomous system. As a general practice, ...
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