- IGRP (Interior Gateway Routing Protocol)
Interior Gateway Routing Protocol) A proprietary routing protocol from Cisco that was developed in 1988 to overcome the shortcomings of RIP. IGRP takes bandwidth, latency, reliability and current traffic load into consideration. It is typically used within an autonomous system, such as an Internet domain. IGRP was superseded by Enhanced IGRP (EIGRP), which provides enhancements such as the ability to detect a loop in the network.
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- OSPF (Open Shortest Path First)
OSPF (Open Shortest Path First) is a router protocol used within larger autonomous system networks in preference to the Routing Information Protocol (RIP), an older routing protocol that is installed in many of today's corporate networks. Like RIP, OSPF is designated by the Internet Engineering Task Force (IETF) as one of several Interior Gateway Protocols (IGPs).
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- BGP (The Border Gateway Protocol)
The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. It works by maintaining a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional IGP metrics, but makes routing decisions based on path, network policies and/or rulesets.
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- EGP (Exterior Gateway Protocol)
Exterior Gateway Protocol (EGP) is a protocol for exchanging routing information between two neighbor gateway hosts (each with its own router) in a network of autonomous systems. EGP is commonly used between hosts on the Internet to exchange routing table information. The routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router so that the best available route is chosen. Each router polls its neighbor at intervals between 120 to 480 seconds and the neighbor responds by sending its complete routing table. EGP-2 is the latest version of EGP.