An IGP (Interior Gateway Protocol) is a protocol for exchanging routing information between gateways (hosts with routers) within an autonomous network (for example, a system of corporate local area networks). The routing information can then be used by the Internet Protocol (IP) or other network protocols to specify how to route transmissions.
Also see the Exterior Gateway Protocol (EGP).
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- Bay Networks' comprehensive overview of the Internet Protocol (IP) includes a description of RIP and OSPF.