Summary
Cisco Systems' EIGRP is one of the most feature-rich and robust routing protocols to ever be developed. Its unique combination of features blends the best attributes of distance-vector protocols with the best attributes of link-state protocols. The result is a hybrid routing protocol that defies easy categorization with conventional protocols.
EIGRP is also remarkably easy to configure and use and is remarkably efficient in operation. It can be used in conjunction with IPv4, AppleTalk, and IPX. More importantly, its architecture will readily enable Cisco to add support for other routed protocols, such as IPv6, in the future.
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