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Interior Gateway Routing Protocol Last modified: Friday, February 13, 2004
(n.) Abbreviated as IGRP, a proprietary network protocol, developed by Cisco Systems, designed to work on autonomous systems. IGRP is a distance-vector routing protocol, which means that each router sends all or a portion of its routing table in a routing message update at regular intervals to each of its neighboring routers. A router chooses the best path between a source and a destination. Since each path can comprise many links, the system needs a way to compare the links in order to find the best path. A system such as RIP uses only one criteria -- hops -- to determine the best path. IGRP uses five criteria to determine the best path: the link's speed, delay, packet size, loading and reliability. Network administrators can set the weighting factors for each of these metrics.
Understanding IGRP A white paper from Cisco detailing IGRP.	Related Categories Internet Protocols Routing Related Terms DDR Enhanced Interior Gateway Routing Protocol hot potato routing OSPF router routing Routing Information Protocol virtual router VRRP