Chapter 2. EIGRP

EIGRP Overview

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary, advanced distance vector, classless routing protocol that uses a complex metric based on bandwidth and delay. The following are some features of EIGRP:

• Fast convergence.

• Support for VLSM.

• Partial updates conserve network bandwidth.

• Support for IP, AppleTalk, and IPX.

• Runs directly over IP, using protocol number 88.

• Support for all Layer 2 (data link layer) protocols and topologies.

• Sophisticated metric that supports load-balancing across unequal-cost paths.

• Use of multicast (and unicast where appropriate) instead of broadcasts.

• Support for authentication.

• Manual summarization at any interface. ...

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