# CCNA 3 v3.1 Module 3 EIGRP

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28 Οκτ 2013 (πριν από 4 χρόνια και 8 μήνες)

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CCNA 3 v3.1 Module 3

EIGRP

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Purpose of This PowerPoint

This PowerPoint primarily consists of the Target
Indicators (TIs) of this module in CCNA version
3.1.

It was created to give instructors a PowerPoint to
take and modify as their own.

This PowerPoint is:

NOT a study guide for the module final assessment.

NOT a study guide for the CCNA certification exam.

Please report any mistakes you find in this
PowerPoint by using the Academy Connection

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To Locate Instructional Resource Materials

Go to the Community FTP Center to locate
materials created by the instructor community

Go to the Tools section

Go to the Alpha Preview section

Go to the Community link under Resources

See the resources available on the Class home
page for classes you are offering

Search
http://www.cisco.com

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Objectives

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Comparing EIGRP with IGRP

Comparisons between EIGRP and IGRP
fall into the following major categories:

Compatibility mode

Metric calculation

Hop count

Automatic protocol redistribution

Route tagging

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Using EIGRP with IGRP

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EIGRP and IGRP Metric Calculation

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Comparing
show ip route

for EIGRP and IGRP

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EIGRP Concepts

The following three tables are maintained
by EIGRP:

Neighbor table

Topology table

Routing table

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The EIGRP Topology Table

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EIGRP Concepts

Every EIGRP router maintains a topology
table for each configured network
protocol.

All learned routes to a destination are
maintained in the topology table.

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EIGRP Successors and Feasible
Successors

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EIGRP Design Features

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EIGRP Technologies

Neighbor discovery and recovery

Reliable Transport Protocol

DUAL finite
-
state machine algorithm

Protocol
-
dependent modules

By forming adjacencies, EIGRP routers:

Dynamically learn of new routes that join their network

Identify routers that become either unreachable or
inoperable

Rediscover routers that had previously been
unreachable

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Data Structure

The five EIGRP packet types are

as follows
:

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Default Hello Intervals and Hold Times for
EIGRP

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Feasible Successor Route Selection Rules

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Configuring EIGRP

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EIGRP Automatically Summarizes Based
on Class

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Manual Summarization with EIGRP

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Verifying EIGRP

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EIGRP
debug

Commands

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Building Neighbor Tables

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Discover Routes

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Select Routes

If a link goes down, DUAL looks for an alternative
route path, or feasible successor, in the topology
table.

If a feasible successor is not found, the route is
flagged as Active, or unusable at present.

Query packets are sent to neighboring routers
requesting topology information.

DUAL uses this information to recalculate
successor and feasible successor routes to the
destination.

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Troubleshooting Process

1.
Analyze the network failure, make a clear problem statement.

2.
Gather the facts needed to help isolate possible causes.

3.
Consider possible problems based on the facts that have been
gathered.

4.
Create an action plan based on the remaining potential problems.

5.
Implement the action plan, performing each step carefully while
testing to see whether the symptom disappears.

6.
Analyze the results to determine whether the problem has been
resolved. If it has, the process is complete.

7.
If the problem has not been resolved, create an action plan based on
the next most likely problem in the list. Return to Step 4, change one
variable at a time, and repeat the process until the problem is solved.

8.
Once the actual cause of the problem is identified, try to solve it.

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Use
show

Commands and TCP/IP Tools

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Troubleshooting RIP Configuration

Layer 1 or Layer 2
connectivity issues exist.

VLSM subnetting is
configured. VLSM subnetting
cannot be used with RIPv1

Mismatched RIPv1 and RIPv2
routing configurations exist.

Network statements are
missing or incorrectly
assigned.

The outgoing interface is
down.

interface is down.

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Troubleshooting IGRP Configuration

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Troubleshooting EIGRP Configuration

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Troubleshooting EIGRP Configuration

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Troubleshooting OSPF Configuration

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Summary