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Summary

EIGRP is a modern routing protocol that combines simplicity and filtering capabilities of the distance-vector routing protocols such as Routing Information Protocol (RIP) or Interior Gateway Routing Protocol (IGRP) with fast convergence of link-state routing protocols such as Open Shortest Path First (OSPF) protocol. EIGRP is also the only routing protocol that supports all three layer-3 protocols most commonly found in enterprise networks: IP, IPX, and AppleTalk.

Configuring EIGRP in a small network is easy and does not require any network design. Therefore, EIGRP is the routing protocol of choice in most networks that do not require multivendor interoperability. An EIGRP network where no real network design was done can grow to a fairly large size without problems, but might also unexpectedly collapse when the number of routers or the number of changes per time unit exceeds a certain hard-to-specify limit. On the other hand, everyone designing and implementing a network based on a link-state routing protocol, such as OSPF, becomes aware of the need to implement network segregation with areas early on in the network growth cycle. The net result is that fewer large OSPF or IS-IS networks experience unexpected outages, but this result is not strictly technology-related. Remember, although EIGRP has the ability to cope with more abuse than link-state protocols, it can also break without warning when it cannot take any more.


  

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