CCNP routing and switching TSHOOT 300 135 official cert guide

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CCNP Routing and
Switching TSHOOT 300-135
Official Cert Guide
Raymond Lacoste
CCSI/CCNP
Kevin Wallace
CCIE No. 7945

Cisco Press
800 East 96th Street
Indianapolis, IN 46240

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ii

CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

CCNP Routing and Switching TSHOOT 300-135
Official Cert Guide
Raymond Lacoste, CCSI/CCNP
Kevin Wallace, CCIE No. 7945
Copyright© 2015 Pearson Education, Inc.

Published by:
Cisco Press
800 East 96th Street
Indianapolis, IN 46240 USA
All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or by any information storage and retrieval
system, without written permission from the publisher, except for the inclusion of brief quotations in a
review.
Printed in the United States of America
First Printing December 2014
Library of Congress Control Number: 2014950275
ISBN-10: 1-58720-561-0
ISBN-13: 978-1-58720-561-3

Warning and Disclaimer
This book is designed to provide information about the 300-135 Troubleshooting and Maintaining Cisco
IP Networks (TSHOOT) exam for the CCNP Routing and Switching certification. Every effort has been
made to make this book as complete and as accurate as possible, but no warranty or fitness is implied.
The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shall
have neither liability nor responsibility to any person or entity with respect to any loss or damages
arising from the information contained in this book or from the use of the discs or programs that may
accompany it.
The opinions expressed in this book belong to the author and are not necessarily those of Cisco Systems,
Inc.

Trademark Acknowledgments
All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Cisco Press or Cisco Systems, Inc., cannot attest to the accuracy of this information.
Use of a term in this book should not be regarded as affecting the validity of any trademark or service
mark.

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Special Sales
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Publisher: Paul Boger

Copy Editor: Keith Cline

Associate Publisher: Dave Dusthimer

Technical Editors: Ryan Lindfield, Diane Teare

Business Operation Manager, Cisco Press:
Jan Cornelssen

Team Coordinator: Vanessa Evans

Executive Editor: Brett Bartow
Managing Editor: Sandra Schroeder
Development Editor: Ellie Bru

Designer: Mark Shirar
Composition: Tricia Bronkella
Indexer: Lisa Stumpf
Proofreader: The WordSmithery LLC

Project Editor: Mandie Frank

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

About the Authors
Raymond Lacoste is a Cisco Certified Systems Instructor (CCSI) who has dedicated his
IT career to teaching others. Starting out as a mentor at Skillsoft, he helped students with
their studies, explaining various Cisco, Microsoft, and industry-related concepts in ways

that improved the students understanding. Now he spends his days at Skillsoft teaching
the CCNA and CCNP Routing and Switching certification track. He has taught over 300
Cisco classes in addition to the countless practice labs, demonstrations, hands-on labs,
and student guides he has developed. However, it is not just about teaching, it is also
about learning. To date, Raymond has passed more than 100 IT certification exams as he
continues to keep his learning and knowledge up-to-date. His certification wall includes
various Cisco certifications, Microsoft certifications, CompTIA certifications, and the
ISC2 CISSP (Certified Information Systems Security Professional) designation. He was
also awarded the Cisco Sirius Top Quality Instructor award. His next goal is to achieve
the CCIE designation in Routing and Switching. Raymond lives in Atlantic, Canada, with
his wife, Melanie, and two children.
Kevin Wallace, CCIEx2 (Collaboration and R/S) #7945, CCSI #20061: With Cisco
experience dating back to 1989, Kevin has been a network design specialist for the Walt
Disney World Resort, an instructor of Cisco courses for Skillsoft, and a network manager for Eastern Kentucky University.
Kevin currently produces video courses and writes books for Cisco Press/Pearson IT
Certification ( and he lives in central Kentucky with his wife
(Vivian) and two daughters (Stacie and Sabrina).
Kevin can be followed on these social media platforms.
Blog:
Twitter: />Facebook: />YouTube: />LinkedIn: />Google+: />
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About the Technical Reviewers
Ryan Lindfield is an instructor and technical consultant with Stormwind. On a typical day he’s broadcasting official Cisco training from a video studio. When not in the
virtual classroom, he can be found supporting customer networks. Ryan has nearly

20 years of technical consulting experience, and over a decade in the classroom. He
has delivered training for network, security, and data center technologies around the
world. Certifications include: CCNP Routing & Switching, CCNP Security, HP Master
Accredited Systems Engineer, VMware VCP, CEH, CISSP, SANS GFCA, CISSP, ECSA,
CHFI, CPTE, CPTC, OSWP, and many Microsoft and CompTIA certifications. Ryan
leads a 150 member Defcon user group in Tampa, FL, and has given presentations for
ISC2 and B-Sides computer security events.
Diane Teare, P.Eng, CCNP, CCDP, CCSI, PMP, is a professional in the networking,
training, project management, and e-learning fields. She has more than 25 years of
experience in designing, implementing, and troubleshooting network hardware and software, and has been involved in teaching, course design, and project management. She
has extensive knowledge of network design and routing technologies. Diane is a Cisco
Certified Systems Instructor (CCSI), and holds her Cisco Certified Network Professional
(CCNP), Cisco Certified Design Professional (CCDP), and Project Management
Professional (PMP) certifications. She is an instructor, and the Course Director for the
CCNA and CCNP Routing and Switching curriculum, with one of the largest authorized
Cisco Learning Partners. She was the director of e-learning for the same company, where
she was responsible for planning and supporting all the company’s e-learning offerings in
Canada, including Cisco courses. Diane has a Bachelor’s degree in applied science in electrical engineering and a Master’s degree in applied science in management science. She
authored or co-authored the following Cisco Press titles: the first and second editions
of Implementing Cisco IP Routing (ROUTE); the second edition of Designing Cisco
Network Service Architectures (ARCH); Campus Network Design Fundamentals; the
three editions of Authorized Self-Study Guide Building Scalable Cisco Internetworks
(BSCI); and Building Scalable Cisco Networks. Diane edited the first two editions
of the Authorized Self-Study Guide Designing for Cisco Internetwork Solutions
(DESGN), and also edited Designing Cisco Networks.

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

Dedications
This book is dedicated to two very special people who supported me in my early years
of IT, without whom this book would not have been possible. I will forever be grateful
for the opportunity you gave me so many years ago to pursue my career. Thank you!
Raymond Lacoste

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vii

Acknowledgments
A big thank you to my wife for encouraging me to write this book and supporting me
over the months that it took to complete it. Great big hugs to my two wonderful children, ages 9 and 5, who had no idea why Daddy was always sitting at the computer; for
some strange reason, though, they knew that it was important and supported me in their
own mysterious ways. I love you guys!
An equally big thank you to my parents, without whom I would not be where I am or
who I am today, and to my sister, Terry-Anne, who always kicked me in the right direction.
Thanks to Dan Young, my mentor and the Director of Live Learning at Skillsoft, for all
the support and encouragement you have provided me all these years.
I’d like to thank Ellie Bru, my Development Editor, for organizing and putting into
action all the parts needed to develop this book (definitely not an easy task).
Thank you to Mandie Frank, my Production Editor, for putting all the final pieces of

this book together so nicely and making sure that it resembles a book.
Thank you to Diane Teare and Ryan Lindfield for reviewing the book and making sure
it’s technically sound.
Keith Cline, thank you for making sure all i’s were “crossed” and t’s “dotted” within the
book. (HaHaHa) You found some items in this book that I didn’t even know existed.
Thank you!
Thank you to Brett Bartow, my Executive Editor, for giving me the opportunity to write
this detailed book.
A big thank you to Kevin Wallace, the author of the previous edition of TSHOOT and a
friend, who passed the torch on to me for this edition. Thank you.
Lastly, thank you to the entire team at Cisco Press, their families and friends, who work
extremely hard to produce high-quality training materials.
—Raymond Lacoste

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

Contents at a Glance
Introduction

xxx

Part I

Fundamental Troubleshooting and Maintenance Concepts

Chapter 1

Introduction to Troubleshooting and Network Maintenance

Chapter 2

Troubleshooting and Maintenance Tools

Chapter 3

Troubleshooting Device Performance

Part II

Troubleshooting Cisco Catalyst Switch Features

Chapter 4

Troubleshooting Layer 2 Trunks, VTP, and VLANs

Chapter 5

Troubleshooting STP and Layer 2 EtherChannel

Chapter 6

Troubleshooting Inter-VLAN Routing and Layer 3 EtherChannels

Chapter 7

Troubleshooting Switch Security Features

Chapter 8

Troubleshooting First-Hop Redundancy Protocols

Part III

Troubleshooting Router Features

Chapter 9

Troubleshooting IPv4 Addressing and Addressing Technologies

335

Chapter 10

Troubleshooting IPv6 Addressing and Addressing Technologies

367

Chapter 11

Troubleshooting IPv4 and IPv6 ACLs and Prefix Lists

Chapter 12

Troubleshooting Basic IPv4/IPv6 Routing and GRE Tunnels 423

Chapter 13

Troubleshooting RIPv2 and RIPng

Chapter 14

Troubleshooting EIGRP

513

Chapter 15

Troubleshooting OSPF

587

Chapter 16

Troubleshooting Route Maps and Policy-Based Routing

Chapter 17

Troubleshooting Redistribution

Chapter 18

Troubleshooting BGP

Part IV

Troubleshooting Management

Chapter 19

Troubleshooting Management Protocols and Tools

Chapter 20

Troubleshooting Management Access

3

41

93

129
169
209

247
287

397

463

675

697

749

815

851

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Part V

Final Preparation

Chapter 21

Additional Trouble Tickets 871

Chapter 22

Final Preparation 943

Part VI

Appendixes

Appendix A

Answers to the “Do I Know This Already” Quizzes

Appendix B

TSHOOT Exam Updates
Index

951

957

960

CD-Only Appendixes and Glossary
Appendix C

Memory Tables

Appendix D

Memory Tables Answer Key

Appendix E

Study Planner
Glossary

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

Contents
Introduction

xxx

Part I

Fundamental Troubleshooting and Maintenance Concepts

Chapter 1

Introduction to Troubleshooting and Network Maintenance
“Do I Know This Already?” Quiz
Foundation Topics

3

3

9

Introduction to Troubleshooting
Defining Troubleshooting

9

9

The Value of Structured Troubleshooting
A Structured Approach
1. Problem Report

11

13

13

2. Collect Information

14

3. Examine Collected Information 15
4. Eliminate Potential Causes 16
5. Propose an Hypothesis
6. Verify Hypothesis

17

18

7. Problem Resolution

19

Popular Troubleshooting Methods
The Top-Down Method

21

The Bottom-Up Method

21

20

The Divide-and-Conquer Method

22

The Following the Traffic Path Method

23

The Comparing Configurations Method

23

The Component Swapping Method

24

Practice Exercise: Selecting a Troubleshooting Approach
Introduction to Network Maintenance

25

26

Defining Network Maintenance 26
Proactive Versus Reactive Network Maintenance
Well-Known Network Maintenance Models

27

28

Example of Adapting a Network Maintenance Model 28
Common Maintenance Procedures 29
Routine Maintenance Tasks 29
Scheduled Maintenance

30

Managing Network Changes

30

Maintaining Network Documentation

32

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xi
Restoring Operations After a Failure

33

Measuring Network Performance 34
The Troubleshooting and Network Maintenance Relationship
Maintaining Current Network Documentation
Establishing a Baseline
Communication

36
37

Exam Preparation Tasks

39

Review All Key Topics

Chapter 2

39

39

Troubleshooting and Maintenance Tools
“Do I Know This Already?” Quiz
Foundation Topics

35

36

Change Management

Define Key Terms

34

41

41

45

The Troubleshooting and Network Maintenance Toolkit 45
Network Documentation Tools
Basic Tools

46

47

CLI Tools

47

GUI Tools

48

Recovery Tools
Logging Tools

48
53

Network Time Protocol as a Tool
Advanced Tools

56

57

Overview of SNMP and NetFlow

57

Creating a Baseline with SNMP and NetFlow
SNMP

58

58

NetFlow

59

Cisco Support Tools

64

Using Cisco IOS to Verify and Define the Problem
Ping
Telnet

64

64
67

Traceroute

67

Using Cisco IOS to Collect Information

68

Filtering the Output of show Commands 69
Redirecting show Command Output to a File 73
Troubleshooting Hardware

74

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
Collecting Information in Transit

75

Performing Packet Captures 75
SPAN
RSPAN

76
78

Using Tools to Document a Network

80

Exam Preparation Tasks 85
Review All Key Topics
Define Key Terms

85

86

Complete Tables and Lists from Memory 86
Command Reference to Check Your Memory
Chapter 3

86

Troubleshooting Device Performance 93
“Do I Know This Already?” Quiz 93
Foundation Topics

96

Troubleshooting Switch Performance Issues

96

Cisco Catalyst Switch Troubleshooting Targets
TCAM Troubleshooting

96

101

High CPU Utilization Troubleshooting on a Switch
Troubleshooting Router Performance Issues

105

106

Excessive CPU Utilization 107
Understanding Packet-Switching Modes (Routers and Multilayer
Switches) 113
Troubleshooting Packet-Switching Modes
Excessive Memory Utilization
Exam Preparation Tasks
Review All Key Topics
Define Key Terms

116

121

124
124

124

Complete Tables and Lists from Memory

125

Command Reference to Check Your Memory

125

Part II

Troubleshooting Cisco Catalyst Switch Features

Chapter 4

Troubleshooting Layer 2 Trunks, VTP, and VLANs

129

“Do I Know This Already?” Quiz 129
Foundation Topics

132

Frame-Forwarding Process
Troubleshooting Trunks

132

140

Encapsulation Mismatch

141

Incompatible Trunking Modes

143

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VTP Domain Name Mismatch
Native VLAN Mismatch
Allowed VLANs

146

146

147

Troubleshooting VTP

148

Domain Name Mismatch
Version Mismatch

148

149

Mode Mismatch 149
Password Mismatch

151

Higher Revision Number
Troubleshooting VLANs

151

152

Incorrect IP Addressing

152

Missing VLAN 153
Incorrect Port Assignment
The MAC Address Table
Layer 2 Trouble Tickets

155
157

Trouble Ticket 4-1

158

Trouble Ticket 4-2

160

Exam Preparation Tasks
Review All Key Topics
Define Key Terms

154

165
165

165

Complete Tables and Lists from Memory

166

Command Reference to Check Your Memory
Chapter 5

166

Troubleshooting STP and Layer 2 EtherChannel
“Do I Know This Already?” Quiz
Foundation Topics

172

Spanning Tree Protocol Overview
Reviewing STP Operation
Determining Root Port

172

173
175

Determining Designated Port

176

Determining Nondesignated Port

176

Collecting Information About an STP Topology
Gathering STP Information
STP Troubleshooting Issues

177

177

Gathering MSTP Information

179

180

Corruption of a Switch’s MAC Address Table
Broadcast Storms

169

169

180

181

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
Troubleshooting STP Features
PortFast

182

183

BPDU Guard

184

BPDU Filter

187

Root Guard

189

Loop Guard

190

STP Trouble Tickets

190

Trouble Ticket 5-1

191

Trouble Ticket 5-2

194

Trouble Ticket 5-3

196

Troubleshooting Layer 2 EtherChannel
Reviewing Layer 2 EtherChannel
EtherChannel Trouble Tickets
Trouble Ticket 5-4

201

Trouble Ticket 5-5

204

Exam Preparation Tasks
Review All Key Topics

Define Key Terms

199

199

200

206
206

206

Complete Tables and Lists from Memory

207

Command Reference to Check Your Memory
Chapter 6

207

Troubleshooting Inter-VLAN Routing and Layer 3 EtherChannels
“Do I Know This Already?” Quiz
Foundation Topics

209

209

212

Troubleshooting a Router-on-a-Trunk/Stick 212
Router-on-a-Trunk/Stick Trouble Tickets

213

Trouble Ticket 6-1 214
Trouble Ticket 6-2 218
Troubleshooting Switched Virtual Interfaces 221
Reviewing SVIs

221

Troubleshooting SVIs

223

SVI Trouble Tickets 224
Trouble Ticket 6-3 225
Trouble Ticket 6-4 230
Troubleshooting Routed Ports 233
Routed Ports Trouble Tickets

234

Trouble Ticket 6-5 235

From the Library of Outcast Outcast

xv
Troubleshooting Layer 3 EtherChannel
Layer 3 EtherChannel Trouble Tickets
Trouble Ticket 6-6

239

240

Exam Preparation Tasks

244

Review All Key Topics
Define Key Terms

237

244

244

Complete Tables and Lists from Memory

245

Show Command Reference to Check Your Memory
Chapter 7

Troubleshooting Switch Security Features
“Do I Know This Already?” Quiz
Foundation Topics

245

247

247

250

Troubleshooting Port Security

250

Common Port Security Issues

250

Port Security Configured but Not Enabled

250

Static MAC Address Not Configured Correctly

251

Maximum Number of MAC Addresses Reached

253

Legitimate Users Being Blocked Because of Violation

254

Running Configuration Not Saved to Startup Configuration
Port Security Trouble Tickets
Trouble Ticket 7-1

260

261

261

Troubleshooting Spoof-Prevention Features

265

DHCP Snooping 265
Dynamic ARP Inspection
IP Source Guard

267

268

Spoof-Prevention Features Trouble Tickets
Trouble Ticket 7-2

270

Troubleshooting Access Control
Protected Ports

273

Private VLANs

275

VACLs

270

273

279

Exam Preparation Tasks
Review All Key Topics
Define Key Terms

281
281

282

Command Reference to Check Your Memory

282

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
Chapter 8

Troubleshooting First-Hop Redundancy Protocols
“Do I Know This Already?” Quiz
Foundation Topics

287

287

290

Troubleshooting HSRP 290
Reviewing HSRP

290

HSRP Converging After a Failure

291

HSRP Verification and Troubleshooting

292

Virtual Router MAC Address 293
Interface Tracking

293

Verifying First Hop
Debug

294

296

HSRP Trouble Tickets

297

Trouble Ticket 8-1

297

Trouble Ticket 8-2

300

Trouble Ticket 8-3

302

Troubleshooting VRRP
Reviewing VRRP

306

306

VRRP Verification and Troubleshooting

308

Virtual Router MAC Address 309
Object Tracking 309
Verifying First Hop
VRRP Trouble Tickets

310
312

Trouble Ticket 8-4

312

Trouble Ticket 8-5

315

Troubleshooting GLBP

Reviewing GLBP

318

319

GLBP Verification and Troubleshooting
Virtual Router MAC Addresses
GLBP Object Tracking

Verifying GLBP First Hop
326

Trouble Ticket 8-6

327

Trouble Ticket 8-7

329

325

Comparing HSRP, VRRP, and GLBP
Review All Key Topics

323

323

GLBP Trouble Tickets

Exam Preparation Tasks

321

330

332
332

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xvii
Define Key Terms

333

Complete Tables and Lists from Memory

333

Command Reference to Check Your Memory

333

Part III

Troubleshooting Router Features

Chapter 9

Troubleshooting IPv4 Addressing and Addressing Technologies
“Do I Know This Already?” Quiz
Foundation Topics

335

338

Troubleshooting IPv4 Addressing
IPv4 Addressing Issues

338

338

Determining IP Addresses Within a Subnet
Troubleshooting DHCP for IPv4

342

Reviewing DHCP Operations

342

Potential DHCP Troubleshooting Issues
DHCP Troubleshooting Commands
Troubleshooting NAT

Reviewing NAT

341

347

348

350

350

NAT Troubleshooting Issues

353

NAT Troubleshooting Commands

354

IPv4 Addressing and Addressing Technologies Trouble Tickets
Trouble Ticket 9-1

356

Trouble Ticket 9-2

358

Trouble Ticket 9-3

361

Exam Preparation Tasks
Review All Key Topics
Define Key Terms

356

364
364

365

Command Reference to Check Your Memory
Chapter 10

365

Troubleshooting IPv6 Addressing and Addressing Technologies
“Do I Know This Already?” Quiz
Foundation Topics

335

367

367

370

Troubleshooting IPv6 Addressing

370

IPv6 Addressing Review 370
Neighbor Solicitation and Neighbor Advertisement
EUI-64

370

373

Troubleshooting IPv6 Address Assignment

375

Stateless Address Autoconfiguration/SLAAC
Stateful DHCPv6

375

381

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide

Stateless DHCPv6

382

DHCPv6 Operation
DHCPv6 Relay Agent

384
385

IPv6 Addressing Trouble Tickets
Trouble Ticket 10-1

386

Trouble Ticket 10-2

389

Exam Preparation Tasks
Review All Key Topics
Define Key Terms

386

394
394

395

Command Reference to Check Your Memory
Chapter 11

395

Troubleshooting IPv4 and IPv6 ACLs and Prefix Lists

397

“Do I Know This Already?” Quiz 397
Foundation Topics

401

Troubleshooting IPv4 ACLs
Reading an IPv4 ACL

401

401

Using an IPv4 ACL for Filtering

403

Using a Time-Based IPv4 ACL 403
IPv4 ACL Trouble Tickets 405
Trouble Ticket 11-1 405
Troubleshooting IPv6 ACLs
Reading an IPv6 ACL

407

408

Using an IPv6 ACL for Filtering

409

IPv6 ACL Trouble Tickets 410
Trouble Ticket 11-2 410
Troubleshooting Prefix Lists

414

Reading a Prefix List 414
Prefix List Processing 415
Prefix List Trouble Tickets 416
Trouble Ticket 11-3 417
Exam Preparation Tasks 419
Review All Key Topics
Define Key Terms

419

419

Command Reference to Check Your Memory

419

From the Library of Outcast Outcast


xix
Chapter 12

Troubleshooting Basic IPv4/IPv6 Routing and GRE Tunnels
“Do I Know This Already?” Quiz
Foundation Topics

423

427

Packet-Forwarding Process

427

Reviewing Layer 3 Packet-Forwarding Process

427

Troubleshooting the Packet-Forwarding Process
Troubleshooting Routing Information Sources
Data Structures and the Routing Table
Sources of Route Information
Troubleshooting Static Routes
IPv4 Static Routes

439

IPv6 Static Routes

443

Trouble Ticket 12-1

445

Trouble Ticket 12-2

448

Troubleshooting GRE Tunnels
Exam Preparation Tasks
Review All Key Topics

436

436

445

450

459
459

460

Complete Tables and Lists from Memory

460

Command Reference to Check Your Memory
Chapter 13

431

435

438

Static Routing Trouble Tickets

Define Key Terms

423

Troubleshooting RIPv2 and RIPng

460

463

“Do I Know This Already?” Quiz 463
Foundation Topics

466

Troubleshooting RIPv2

466

Missing RIPv2 Routes

466

Interface Is Shut Down

469

Wrong Subnet 469
Bad or Missing Network Statement

470

Passive Interface 471
Wrong Version 473
Max Hop Count Exceeded
Authentication

475

477

Route Filtering 479
Split Horizon 480
Autosummarization

482

Better Source of Information

483

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CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
ACLs

485

Load Sharing

485

Other RIP Issues

486

Missing Default Route
Route Summarization
Troubleshooting RIPng

486
487

492

RIPv2 and RIPng Trouble Tickets 498
Trouble Ticket 13-1 498
Trouble Ticket 13-2 502
Trouble Ticket 13-3 506
Exam Preparation Tasks 509
Review All Key Topics
Define Key Terms

509

510

Command Reference to Check Your Memory
Chapter 14

510

Troubleshooting EIGRP 513
“Do I Know This Already?” Quiz
Foundation Topics

513

517

Troubleshooting EIGRP for IPv4 517
Troubleshooting EIGRP for IPv4 Neighbor Adjacencies 517
Interface Is Down

518

Mismatched Autonomous System Numbers
Incorrect Network Statement

518

520

Mismatched K Values 522
Passive Interface 523
Different Subnets
Authentication
ACLs
Timers

524

525

527
528

Troubleshooting EIGRP for IPv4 Routes
Bad or Missing Network Command

Better Source of Information

528

529

530

Route Filtering 534
Stub Configuration 535
Interface Is Shut Down
Split-horizon

537

537

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xxi
Troubleshooting Miscellaneous EIGRP for IPv4 Issues
Feasible Successors

539

539

Discontiguous Networks and Autosummarization
Route Summarization

542

543

Load Balancing 544
EIGRP for IPv4 Trouble Tickets
Trouble Ticket 14-1

546

Trouble Ticket 14-2

553

Trouble Ticket 14-3

557

Troubleshooting EIGRP for IPv6

546

561

Troubleshooting EIGRP for IPv6 Neighbor Issues
Interface Is Down

561

561

Mismatched Autonomous System Numbers

562

Mismatched K Values 562
Passive Interfaces 562
Mismatched Authentication
Timers

562

563

Interface Not Participating in Routing Process
ACLs

563

564

Troubleshooting EIGRP for IPv6 Route

564

Interface Not Participating in Routing Process
Better Source of Information

564

565

Route Filtering 565
Stub Configuration 565
Split-horizon

566

EIGRP for IPv6 Trouble Tickets
Trouble Ticket 14-4

567

568

Troubleshooting Named EIGRP Configurations
Named EIGRP Verification Commands
Named EIGRP Trouble Tickets
Trouble Ticket 14-5
Exam Preparation Tasks
Review All Key Topics
Define Key Terms

572

573

577

577
582
582

583

Command Reference to Check Your Memory

583

From the Library of Outcast Outcast


xxii

CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
Chapter 15

Troubleshooting OSPF

587

“Do I Know This Already?” Quiz 587
Foundation Topics

590

Troubleshooting OSPFv2

590

Troubleshooting OSPFv2 Neighbor Adjacencies
Interface Is Down

590

593

Interface Not Running the OSPF Process
Mismatched Timers

594

Mismatched Area Numbers
Mismatched Area Type
Different Subnets

593

596

597

598

Passive Interface 599
Mismatched Authentication Information
ACLs

600

601

MTU Mismatch

602

Duplicate Router IDs

603

Mismatched Network Types

604

Troubleshooting OSPFv2 Routes

606

Interface Not Running the OSPF Process
Better Source of Information

606

607

Route Filtering 611
Stub Area Configuration
Interface Is Shut Down

613
614

Wrong Designated Router Was Elected 615
Duplicate Router IDs

619

Troubleshooting Miscellaneous OSPFv2 Issues

620

Tracking OSPF Advertisements Through a Network
Route Summarization
Discontiguous Areas

620

622
624

Load Balancing 626
Default Route

627

OSPFv2 Trouble Tickets

627

Trouble Ticket 15-1

628

Trouble Ticket 15-2

635

Trouble Ticket 15-3

639

Troubleshooting OSPFv3 for IPv6

641

OSPFv3 Troubleshooting Commands

641

From the Library of Outcast Outcast


xxiii
OSPFv3 Trouble Tickets

647

Trouble Ticket 15-4

647

Trouble Ticket 15-5

650

Troubleshoot OSPFv3 Address Families

655

OSPFv3 Address Family Troubleshooting
OSPFv3 AF Trouble Tickets
Trouble Ticket 15-6
Exam Preparation Tasks
Review All Key Topics
Define Key Terms

655

664

665
669
669

670

Complete Tables and Lists from Memory

670

Command Reference to Check Your Memory
Chapter 16

671

Troubleshooting Route Maps and Policy-Based Routing

675

“Do I Know This Already?” Quiz 675
Foundation Topics

678

Troubleshooting Route Maps

678

How to Read a Route Map

678

Troubleshooting Policy-Based Routing
PBR

681

681

Policy-Based Routing Trouble Tickets

684

Trouble Ticket 16-1 685
Trouble Ticket 16-2 689
Trouble Ticket 16-3 691
Exam Preparation Tasks 693
Review All Key Topics
Define Key Terms

693

693

Command Reference to Check Your Memory
Chapter 17

Troubleshooting Redistribution
“Do I Know This Already?” Quiz
Foundation Topics

693

697
697

700

Troubleshooting IPv4 and IPv6 Redistribution

Route Redistribution Overview

700

700

Troubleshooting Redistribution into RIP

703

Troubleshooting Redistribution into EIGRP
Troubleshooting Redistribution into OSPF
Troubleshooting Redistribution into BGP

706
710

715

Troubleshooting Redistribution with Route Maps 718

From the Library of Outcast Outcast


xxiv

CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
Redistribution Trouble Tickets
Trouble Ticket 17-1

719

Trouble Ticket 17-2

723

Trouble Ticket 17-3

727

Trouble Ticket 17-4

733

718

Troubleshooting Advanced Redistribution Issues

737

Troubleshooting Suboptimal Routing Caused by Redistribution
Troubleshooting Routing Loops Caused by Redistribution
Exam Preparation Tasks
Review All Key Topics
Define Key Terms

739

745
745

745

Command Reference to Check Your Memory
Chapter 18

737

746

Troubleshooting BGP 749
“Do I Know This Already?” Quiz 749
Foundation Topics

753

Troubleshooting BGP Neighbor Adjacencies
Interface Is Down

753

754

Layer 3 Connectivity Is Broken

754

Path to Neighbor Is via Default Route

755

Neighbor Does Not Have a Route to the Local Router

756

Incorrect neighbor Statement 757
BGP Packets Sourced from Wrong IP Address
ACLs

759

TTL of BGP Packet Expires

761

Mismatched Authentication

763

Misconfigured Peer Groups

764

Timers

758

765

Troubleshooting BGP Routes

766

Missing or Bad network mask Command 768
Next-Hop Router Not Reachable 770
BGP Split-Horizon Rule

772

Better Source of Information
Route Filtering

773

775

Troubleshooting BGP Path Selection

780

Understanding the Best Path Decision-Making Process
Private Autonomous System Numbers
Using debug Commands

781

784

784

From the Library of Outcast Outcast