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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 6. Implementing EIGRP

Enhanced IGRP (EIGRP) is a Cisco-proprietary routing protocol. EIGRP is a classless routing protocol, meaning that it sends the subnet mask of its interfaces in routing updates, which use a complex metric based on bandwidth and delay.

EIRGP is an advanced distance vector protocol with some link-state features. As such, EIGRP is classified as a balanced hybrid protocol.

EIGRP Features

  • Protocol-independent modules: EIGRP supports IP, IPv6, Internetwork Packet Exchange (IPX), and AppleTalk.

  • Reliable Transport Protocol: RTP controls sending, tracking, and acknowledging updates and EIGRP messages.

  • Neighbor discovery/recovery: EIGRP discovers neighboring devices using periodic Hello messages.

  • Diffusing Update Algorithm (DUAL): ...

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