Category Archives: IGRP

Interior Gateway Routing Protocol (IGRP)

IGRP thumb Interior Gateway Routing Protocol (IGRP) Interior Gateway Routing Protocol is a distance vector routing protocol developed by Cisco systems for routing multiple protocols across small and medium sized Cisco networks. It is proprietary which requires that you use Cisco routers. This contrasts with IP RIP and IPX RIP, which are designed for multi-vendor networks. IGRP will route IP, IPX, Decnet and AppleTalk which makes it very versatile for clients running many different protocols. It is somewhat more scalable than RIP since it supports a hop count of 100, only advertises every 90 seconds and uses a composite of five different metrics to select a best path destination. Note that since IGRP advertises less frequently, it uses less bandwidth than RIP but converges much slower since it is 90 seconds before IGRP routers are aware of network topology changes. IGRP does recognize assignment of different autonomous systems and automatically summarizes at network class boundaries. As well there is the option to load balance traffic across equal or unequal metric cost paths.

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Tags: igrp configuration in packet tracer, how to configure igrp in packet tracer, igrp packet tracer, IGRP (Interior gateway routing protocol)

Routing Protocols: IGRP vs EIGRP

RoutingProtocolsIGRPvsEIGRP thumb1 Routing Protocols: IGRP vs EIGRP IGRP, which stands for Internet Gateway Routing Protocol, is a relatively old routing protocol that was invented by Cisco. It has been largely replaced by the newer and more superior Enhanced-IGRP, more commonly known as EIGRP, since 1993. Even in Cisco the Cisco curriculum, IGRP is only discussed as an obsolete protocol as an introduction to EIGRP.

The main reason behind the advent of EIGRP is to move away from classful routing protocols like IGRP because of the rapidly depleting IPv4 addresses. IGRP simply assumes that all elements in a given class belong to the same subnet. EIGRP utilizes variable length subnet masks (VLSM) to make more efficient use of the short supply of IPv4 addresses, prior to the advent of IPv6 .

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Tags: routing protocols, routing, igrp protocol, igrp