BGP Basics
BGP, specifically BGP version 4 (BGPv4), is the one routing protocol in popular use today that was designed as an exterior gateway protocol (EGP) instead of as an interior gateway protocol (IGP). As such, some of the goals of BGP differ from those of an IGP, such as Open Shortest Path First (OSPF) or Enhanced Interior Gateway Routing Protocol (EIGRP), but some of the goals remain the same.
First, consider the similarities between BGP and various IGPs. BGP does need to advertise IPv4 prefixes, just like IGPs. BGP needs to advertise some information, so that routers can choose one of many routes for a given prefix as the currently best route. As for the mechanics of the protocol, BGP does establish a neighbor relationship before exchanging ...
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