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Routing Information Protocol
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==Similar protocols== [[Cisco]]'s proprietary [[Interior Gateway Routing Protocol]] (IGRP) was a somewhat more capable protocol than RIP. It belongs to the same basic family of [[distance-vector routing protocol]]s. Cisco has ceased support and distribution of IGRP in their router software. It was replaced by the [[Enhanced Interior Gateway Routing Protocol]] (EIGRP) which is a completely new design. While EIGRP still uses a distance-vector model, it relates to IGRP only in using the same composite routing metric. Both IGRP and EIGRP calculated a single composite metric for each route, from a formula of five variables: [[bandwidth (computing)|bandwidth]], [[Network delay|delay]], [[Reliability (computer networking)|reliability]], [[Load (computing)|load]], and [[Maximum transmission unit|MTU]]; though on Cisco routers, by default, only bandwidth and delay are used in this calculation.
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