Building Peer Sessions

The previous chapter examined the process of BGP neighbor negotiation at a fairly technical level. It emphasized the formats of messages exchanged during negotiation. This chapter now expands the examination to consider additional subtleties of the negotiation process. In addition, this section introduces distinctions between internal and external BGP, which have practical implications in building peer sessions.

Although BGP is most commonly used to provide a loop-free interdomain topology, BGP is also used internal to an autonomous system (AS) to provide internal routers with external destination reachability information. A neighbor connection (also referred to as a peer connection) between two routers can be established ...

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