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.

Dig Deeper on IPv6 security and network protocols security

BGP tutorial: How the routing protocol works Border Gateway Protocol is the complex routing protocol that literally makes the internet work. This tutorial walks you through how BGP functions and offers troubleshooting options.

gateway A gateway is a network node used in telecommunications that connects two networks with different transmission protocols together.

BGP (Border Gateway Protocol) BGP (Border Gateway Protocol) is a protocol that manages how packets are routed across the internet through the exchange of routing and reachability information between edge routers.

OSPF (Open Shortest Path First) The OSPF router protocol is used to find the best path for packets as they pass through a set of connected networks. OSPF is one of several Interior Gateway Protocols that replaces the Routing Information Protocol (RIP), an older routing protocol that is installed in many of today's corporate networks.

Border Gateway Protocol as a hybrid SDN protocol Border Gateway Protocol (BGP), a well-known core Internet protocol, is being adapted for use as a hybrid SDN protocol.

Unified threat management (UTM) integration challenges The Border Gateway Protocol (BGP) is the most important protocol on the Internet, and is used to link the multiple networks that makes up the Internet. Although it performs well, it suffers from many security weaknesses.

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IGP (Interior Gateway Protocol)

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