EIGRP Overview and Neighbor Relationships ccna course training in delhi

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Enhanced Interior Gateway Routing Protocol (EIGRP) is configured with a few relatively
simple commands. In fact, for most any size network, you could go to every router, configure
the router eigrp 1 command, followed by one or more network net-id subcommands
(one for each classful network to which the router is connected), and EIGRP would
likely work, and work very well, with no other configuration.
In spite of that apparent simplicity, here you sit beginning the first of three chapters of
EIGRP coverage in this book. Many reasons exist for the amount of EIGRP material included
here. First, EIGRP includes many optional configuration features that you need to
both understand and master for the CCNP ROUTE exam. Many of these features require
a solid understanding of EIGRP internals as well—a topic that can be conveniently ignored
if you just do the minimal configuration, but something very important to planning, implementing,
and optimizing a medium/large Enterprise network.
Another reason for the depth of EIGRP coverage in this book is due to a fundamental
change in the philosophy of the CCNP exams, as compared with earlier CCNP exam versions.
Cisco has increased the focus on planning for the implementation and verification
of new network designs. The bar has been raised, and in a way that is consistent with typical
engineering jobs. Not only do you need to understand all the EIGRP features, but you
also need to be able to look at a set of design requirements, and from that decide which
EIGRP configuration settings could be useful—and which are not useful. You also must
be able to direct others as to what verification steps would tell them if the implementation
worked or not, rather than just relying on typing a ? and looking around for that little
piece of information you know exists somewhere.
Part II of this book contains three chapters. This chapter briefly reviews the basics of
EIGRP, and delves into all topics related to how EIGRP routers form neighbor relationships.
Chapter 3, “EIGRP Topology, Routes, and Convergence,” then examines many topics
related to how EIGRP chooses routes. Chapter 4, “EIGRP Route Summarization and
Filtering,” then moves on to examine route filtering and route summarization, which
closes the discussion of specific EIGRP features.
This chapter in particular begins with the “EIGRP Basics” section, which is a review of the
core prerequisite facts about EIGRP. Following the review, the chapter examines EIGRP
neighbor relationships, including a variety of configuration commands that impact neighbor
relationships, and the verification commands that you can use to confirm how well
EIGRP neighbors work.