Enhanced Interior Gateway Routing Protocol (EIGRP)

Enhanced Interior Gateway Routing Protocol (EIGRP)

An advanced routing protocol created by Cisco, combining the advantages of link state and distance vector protocols. This protocol has superior convergence attributes, including high operating efficiency. It is referred to as a hybrid routing protocol because it has characteristics of both distance-vector and link-state protocols.

Hybrid Routing Protocol

A routing protocol that uses the attributes of both distance vector and link state. Enhanced Interior Gateway Routing Protocol (Enhanced IGRP) is an example of a hybrid routing protocol.

Neighbor Table

Each router keeps state information about adjacent neighbors. When a newly discovered neighbor is learned on a router interface, the address and interface of that neighbor are recorded, and the information is held in the neighbor table and stored in RAM.

Topology Table

This table is populated by the neighbor table, and the best path to each remote network is found by running the diffusing update algorithm (DUAL). The table contains all destinations advertised by neighboring routers, holding each destination address and a list of neighbors that have advertised the destination.

Successor (Routes in a Routing Table)

This route is used by EIGRP to forward traffic to a destination and is stored in the routing table.

Feasible Successor (Backup Routes)

This is a path considered a backup route. EIGRP will keep up to six feasible successors in the topology table. Only the one with the best metric (the successor) is copied and placed in the routing table.

Routing Table

A table that contains information about the locations of other routers on the network and their distance from the current router.

Route Distribution

This is the term used for translating from one routing protocol into another.