TCP/IP Exterior Gateway Protocol (EGP)
In the days of the early Internet, a small number of centralized core routers that maintained complete information about network reachability did the routing. These core routers exchanged information using the historical interior routing protocol, GGP, which we examined earlier in this chapter. Other noncore routers located around the periphery of this core, both stand-alone and in groups, exchanged network reachability information with the core routers using the first TCP/IP exterior routing protocol: the Exterior Gateway Protocol (EGP).
Internet pioneers Bolt, Beranek, and Newman developed EGP in the early 1980s. It was first formally described in an Internet standard in RFC 827, "Exterior Gateway Protocol ...
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