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Fundamental EIGRP Concepts


  1. "Do I Know This Already?" Quiz
  2. Foundation Topics
  3. Exam Preparation Tasks

Chapter Description

This chapter from CCNP Routing and Switching ROUTE 300-101 Official Cert Guide covers EIGRP fundamentals, EIGRP neighborships, and neighborships over WANs.

Exam Preparation Tasks

Planning Practice

The CCNP ROUTE exam expects test takers to be able to review design documents, create implementation plans, and create verification plans. This section provides some exercises that can help you to take a step back from the minute details of the topics in this chapter, so that you can think about the same technical topics from the planning perspective.

For each planning practice table, simply complete the table. Note that any numbers in parentheses represent the number of options listed for each item in the solutions in Appendix F, “Completed Planning Practice Tables,” which you can find on the CD-ROM accompanying this book.

Design Review Table

Table 4-5 lists several design goals related to this chapter. If these design goals were listed in a design document, and you had to take that document and develop an implementation plan, what implementation options come to mind? For any configuration items, a general description can be used, without any concern about the specific parameters.

Table 4-5 Design Review

Design Goal

Possible Implementation Choices Covered in This Chapter

I mprove EIGRP convergence.

I mplement EIGRP on each router so that neighborships are formed (2).

Limit neighborship formation on interfaces matched with an EIGRP network command (3).

Implementation Plan Peer Review Table

Table 4-6 shows a list of questions that others might ask, or that you might think about, during a peer review of another network engineer’s implementation plan. Complete the table by answering the questions.

Table 4-6 Notable Questions from This Chapter to Consider During an Implementation Plan Peer Review



What happens on a router interface on which an EIGRP network command matches the interface? (2)

What configuration settings prevent EIGRP neighbor discovery on an EIGRP-enabled interface? (2)

What configuration settings prevent any neighborships on an EIGRP-enabled interface?

What settings do potential neighbors check before becoming EIGRP neighbors? (5)

What settings that you might think would impact EIGRP neighbor relationships actually do not prevent neighborship? (3)

Create an Implementation Plan Table

To practice skills useful when creating your own EIGRP implementation plan, list in Table 4-7 configuration commands related to the configuration of the following features. You might want to record your answers outside the book, and set a goal to complete this table (and others like it) from memory during your final reviews before taking the exam.

Table 4-7 Implementation Plan Configuration Memory Drill


Configuration Commands/Notes

Enabling EIGRP on interfaces

Setting Hello and Hold Timers

Passive interfaces

Static EIGRP neighbors


EIGRP router ID

Choose Commands for a Verification Plan Table

To practice skills useful when creating your own EIGRP verification plan, list in Table 4-8 all commands that supply the requested information. You might want to record your answers outside the book, and set a goal to complete this table (and others like it) from memory during your final reviews before taking the exam.

Table 4-8 Verification Plan Memory Drill

Information Needed


Routes that have been added to the IP routing table by EIGRP.

All routes in a router’s routing table.

The specific route for a single destination address or subnet.

A listing of all (both statically configured and dynamically discovered) EIGRP neighbors.

Notation as to whether a neighbor was dynamically discovered or statically configured.

A listing of statistics regarding the numbers of EIGRP messages sent and received by a router.

A listing of interfaces on which EIGRP has been enabled (by virtue of the EIGRP network command).

A listing of the number of EIGRP peers known through a particular interface.

The elapsed time since a neighborship was formed.

The parameters of any EIGRP network commands.

The configured Hello Timer for an interface.

The configured Hold Timer for an interface.

The current actual Hold Timer for a neighbor.

A router’s EIGRP ASN.

A list of EIGRP passive interfaces.

A list of nonpassive EIGRP interfaces.

A listing of EIGRP K-values.

A listing of traffic statistics about EIGRP.

A router’s EIGRP Router ID.

Review All the Key Topics

Review the most important topics from inside the chapter, noted with the Key Topic icon in the outer margin of the page. Table 4-9 lists a reference of these key topics and the page numbers on which each is found.


Table 4-9 Key Topics for Chapter 4

Key Topic Element


Page Number


Configuration step review for basic EIGRP configuration


Table 4-2

Key EIGRP verification commands


Table 4-3

Summary of EIGRP features and facts



Methods of disallowing EIGRP neighborships on an interface, while still advertising the connected subnet


Table 4-4

List of items that can impact the formation of EIGRP neighborships



Rules for choosing an EIGRP Router ID


Complete the Tables and Lists from Memory

Print a copy of Appendix D, “Memory Tables,” (found on the CD), or at least the section for this chapter, and complete the tables and lists from memory. Appendix E, “Memory Tables Answer Key,” also on the CD, includes completed tables and lists to check your work.

Define Key Terms

Define the following key terms from this chapter, and check your answers in the glossary:

  • K-value
  • neighborship
  • Hello interval
  • Hold Timer
  • passive interface