(Internal Gateway Routing Protocol) A protocol developed by Cisco Systems to address the problem of routing within a large network of general topology comprised of segments having different bandwidth and delay characteristics.
Interior Gateway Routing Protocol. Traffic control program for networks, used by routers, developed by Cisco in the early 1980's. Determines the best path through an internet by looking at the delay and bandwidth of the networks between routers.
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.