CCNP BSCI Quick Reference Sheets: Exam 642-901

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, ...