EIGRP is a router protocol that calculates the best path to send packets. It was created by Cisco Systems, Inc. It is an advanced distance vector routing protocol that provides IP-based routing for IP and IPX networks, designed to converge rapidly after topological changes.
EIGRP operates by constructing a graph, or map, of all possible routes to destinations using the metric of total distance to the destination network. It then calculates all possible routes and selects what it believes to be the best one. The routes are chosen based on their composite metric, which includes bandwidth used, load on link, reliability and cost for data packets.
EIGRP operations can be classified into three different categories:
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