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IGP - technical definition
An interior protocol for routing within an Autonomous System (AS), i.e., a group of routers within a given administrative domain. IGP was described in IETF RFC 1074 (1988). Common IGPs include the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) protocol. See also AS, domain, exterior protocol, IETF, interior protocol, OSPF, protocol, RIP, router, and routing.
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