May 2009
Intermediate to advanced
882 pages
22h 55m
English
Content preview from Cisco® Network Professional's: Advanced Internetworking Guide
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4.3. Interior Gateway Routing Protocol (IGRP)
Interior Gateway Routing Protocol (IGRP) is discussed here simply because you need to know of the protocol's existence and the fact that it is not longer used. It was a Cisco-proprietary distance vector routing protocol. In the past, to use IGRP in a network, all the routers had to be Cisco routers. Cisco created this routing protocol to overcome the problems associated with RIP. It has been replaced by EIGRP and is no longer supported by Cisco.
IGRP has a maximum hop count of 255 with the default being 100 (same as EIGRP). This is helpful in larger networks and solves the problem of 15 hops being the maximum possible in a RIP network.
IGRP also uses a different metric than RIP. By default, IGRP ...
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