The Internal Gateway Routing Protocol (IGRP) is a routing protocol that provides routing features in the Autonomous System (AS: AutoMous System). In the mid-1980s, the most commonly used internal routing association is the routing information protocol (RIP). Although RIP is very useful for routing of implementing a small or medium-sized interstitative Internet network, as the network is constantly evolving, the restrictions are also more obvious. The practicality of the Cisco router and the powerful functionality of IGRP have enabled many small Internet organizations to replace RIP with IGRP. As early as the 1990s, Cisco launched an enhanced IGRP, further enhanced IGRP operational efficiency.
IGRP is a distance vector (DISTANCE Vector) Internal Gateway Protocol (IGP). The distance vector routing protocol uses a mathematical distance standard calculation path size, which is the distance vector. The distance vector routing protocol is typically relative to the link status routing protocol (Link-State Routing Protocols), which is mainly: the distance vector routing protocol is sent to all nodes in the Internet to send local connection information.
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