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IGP (Interior Gateway Protocol)

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The Internet is divided into domains, or autonomous systems. A domain is a collection of hosts and routers that use the same routing protocol and are administered by a single authority. IGPs route within a domain. The EGP (Exterior Gateway Protocol) provides a way for two neighboring routers located at edges of their respective domains to exchange messages and information. On the Internet, IGP is used inside regions and EGP ties the regions together. Common IGPs include RIP (Routing Information Protocol), Cisco's IGRP (Interior Gateway Routing Protocol), the OSI's IS-IS (Intermediate System-to-Intermediate System), and the IETF's OSPF (Open Shortest Path First).

RFC 1371 (Choosing a Common IGP for the IP Internet, October 1992) provides some insight into interior gateway protocols.

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