Chapter 2. EIGRP

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary 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

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

  • Sophisticated metric that supports unequal-metric proportional load-balancing

  • Use of multicasts (and unicasts where appropriate) instead of broadcasts

  • Support for authentication

EIGRP Overview

EIGRP’s function is controlled by four key technologies:

  • Neighbor discovery and maintenance—Uses periodic hello messages

  • The Reliable Transport Protocol (RTP)—Controls sending, ...

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