CCNA 3 v3.1 Module 3 EIGRP

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CCNA 3 v3.1 Module 3 EIGRP

222© 2004, Cisco Systems, Inc. All rights reserved.

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 Help link.

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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.

• The advertised network 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