Definition

IGP (Interior Gateway Protocol)

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.

There are two commonly used IGPs: the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) protocol.

Also see the Exterior Gateway Protocol (EGP).

This was last updated in May 2007

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Bay Networks' comprehensive overview of the Internet Protocol (IP) includes a description of RIP and OSPF.

Cisco provides an illustrated paper about the Open Shortest Path First (OSPF) protocol.

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