Exploration_Routing_Chapter_9.pdf

EIGRP

Routing Protocols and

Concepts – Chapter 9

Objectives

Describe the background and history of Enhanced

Interior Gateway Routing Protocol (EIGRP).

Examine the basic EIGRP configuration commands

and identify their purposes.

Calculate the composite metric used by EIGRP.

Describe the concepts and operation of DUAL.

Describe the uses of additional configuration

commands in EIGRP.

Introduction

EIGRP

Roots of EIGRP: IGRP

-Developed in 1985 to overcome RIPv1’s

limited hop count

-Distance vector routing protocol

-Metrics used by IGRP

bandwidth (used by default)

Delay (used by default)

reliability

load

-Discontinued support starting with IOS

12.2(13)T & 12.2(R1s4)S

EIGRP

EIGRP Message Format

EIGRP Header

Data link frame header - contains source and destination MAC

address

IP packet header - contains source & destination IP address

EIGRP packet header - contains AS number

Type/Length/Field - data portion of EIGRP message