Chapter 6. Understanding Enhanced Interior Gateway Routing Protocol (EIGRP)

This chapter covers the following key topics about Enhanced IGRP (EIGRP):

Metrics

EIGRP neighbor relationships

The Diffusing Update Algorithm (DUAL)

DUAL finite-state machine

EIGRP reliable transport protocol

EIGRP packet format

EIGRP behavior

EIGRP summarization

EIGRP query process

Default routes and EIGRP

Unequal-cost load balancing in EIGRP

As the size of network grows larger, you can see that the classical distance vector routing protocols such as IGRP and RIP won’t scale to the needs of the network. Some of the biggest scalability problems of IGRP and RIP are as follows:

Full periodic routing updates that consume bandwidth—RIP sends out its ...

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