1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 3 EIGRP.
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Transcript of 1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 3 EIGRP.
1© 2004, Cisco Systems, Inc. All rights reserved.
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.
333© 2004, Cisco Systems, Inc. All rights reserved.
To Locate Instructional Resource Materials on Academy Connection:
• 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
• Contact your parent academy!
444© 2004, Cisco Systems, Inc. All rights reserved.
Objectives
555© 2004, Cisco Systems, Inc. All rights reserved.
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
666© 2004, Cisco Systems, Inc. All rights reserved.
Using EIGRP with IGRP
777© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP and IGRP Metric Calculation
888© 2004, Cisco Systems, Inc. All rights reserved.
Comparing show ip route for EIGRP and IGRP
999© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP Concepts
• The following three tables are maintained by EIGRP:
Neighbor table
Topology table
Routing table
101010© 2004, Cisco Systems, Inc. All rights reserved.
The EIGRP Topology Table
111111© 2004, Cisco Systems, Inc. All rights reserved.
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.
121212© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP Successors and Feasible Successors
131313© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP Design Features
141414© 2004, Cisco Systems, Inc. All rights reserved.
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
151515© 2004, Cisco Systems, Inc. All rights reserved.
Data Structure
The five EIGRP packet types are as follows:
161616© 2004, Cisco Systems, Inc. All rights reserved.
Default Hello Intervals and Hold Times for EIGRP
171717© 2004, Cisco Systems, Inc. All rights reserved.
Feasible Successor Route Selection Rules
181818© 2004, Cisco Systems, Inc. All rights reserved.
Configuring EIGRP
191919© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP Automatically Summarizes Based on Class
202020© 2004, Cisco Systems, Inc. All rights reserved.
Manual Summarization with EIGRP
212121© 2004, Cisco Systems, Inc. All rights reserved.
Verifying EIGRP
222222© 2004, Cisco Systems, Inc. All rights reserved.
EIGRP debug Commands
232323© 2004, Cisco Systems, Inc. All rights reserved.
Building Neighbor Tables
242424© 2004, Cisco Systems, Inc. All rights reserved.
Discover Routes
252525© 2004, Cisco Systems, Inc. All rights reserved.
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.
262626© 2004, Cisco Systems, Inc. All rights reserved.
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.
272727© 2004, Cisco Systems, Inc. All rights reserved.
Use show Commands and TCP/IP Tools
282828© 2004, Cisco Systems, Inc. All rights reserved.
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.
292929© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting IGRP Configuration
303030© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting EIGRP Configuration
313131© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting EIGRP Configuration
323232© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting OSPF Configuration
333333© 2004, Cisco Systems, Inc. All rights reserved.
Summary