Exploration_Routing_Chapter_9.pdf
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EIGRP
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
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