cisco-642-811

632 Pages·2003·10.59 MB·English

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CCNP Self-Study
CCNP BCMSN Exam
Certification Guide
David Hucaby, CCIE No. 4594
Cisco Press
Cisco Press
800 East 96th Street, 3rd Floor
Indianapolis, IN 46240 USA
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CCNP BCMSN Exam Certification Guide
David Hucaby
Copyright © 2004 Cisco Systems, Inc.
Published by:
Cisco Press
800 East 96th Street, 3rd Floor
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 1 2 3 4 5 6 7 8 9 0
First Printing September 2003
Library of Congress Cataloging-in-Publication Number: 2002115604
ISBN: 1-58720-077-5
Warning and Disclaimer
This book is designed to provide information about selected topics for the Building Cisco Multilayer Switched Networks (BCMSN)
exam for the CCNP 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.
Feedback Information
At Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each book is crafted with care and preci-
sion, undergoing rigorous development that involves the unique expertise of members from the professional technical community.
Readers’ feedback is a natural continuation of this process. If you have any comments regarding how we could improve the quality of
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We greatly appreciate your assistance.
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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Publisher: John Wait Development Editor: Christopher Cleveland
Editor-In-Chief: John Kane Project Editor: San Dee Phillips
Executive Editor: Brett Bartow Copy Editor: Marcia Ellett
Cisco Representative: Anthony Wolfenden Technical Editors: Stephen Daleo, Steve McQuerry, Geoff Tagg
Cisco Press Program Manager: Sonia Torres Chavez Team Coordinator: Tammi Ross
Manager, Marketing Communications, Book Designer: Gina Rexrode
Cisco Systems: Scott Miller
Cover Designer: Louisa Adair
Cisco Marketing Program Manager: Edie Quiroz
Indexer: Tim Wright
Production Manager: Patrick Kanouse
Composition: Octal Publishing, Inc.
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About the Author
David Hucaby, CCIE No. 4594, is a lead network engineer for a large medical environment, using
Cisco multilayer switching and security products. He is also an independent networking consultant,
focusing on Cisco-based solutions for healthcare and banking clients. David lives in Kentucky with
his wife, Marci, and two daughters.
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About the Technical Reviewers
Stephen Daleo, president of Golden Networking Consultants, Inc. is a network consultant whose
clients include the University of South Florida – St. Petersburg, FL and North Broward Hospital
District (Fort Lauderdale, FL). Steve was one of the course developers for Cisco Internet Learning
Solutions Group – BCMSN 2.0 class. Steve is a frequent contributor to the technical content of
Cisco Press books and is an active certified Cisco Systems instructor (97025) teaching the BCMSN,
BCRAN, CIPT, CIT, BSCI, and ICND Cisco courses.
Steve McQuerry, CCIE No. 6108, is an instructor, technical writer, and internetworking consultant
with over 10 years of networking industry experience. He is a certified Cisco Systems instructor
teaching routing and switching concepts to internetworking professionals throughout the world.
Steve is also a founding partner in Intrellix, an internetworking consulting company specializing in
post-sales consulting services.
Geoff Tagg runs a networking consultancy in the UK, where he has over 20 years experience in
working with companies ranging from small local businesses to large multinationals. Prior to that,
he was a systems programmer for a number of years. Geoff’s main specialty is IP network design
and implementation. Geoff lives in Oxford, England with his wife, Christine, and family, and is a
visiting professor at nearby Oxford Brookes University.
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Dedications
As always, this book is dedicated to the most important people in my life—my wife, Marci, and my
two little daughters, Lauren and Kara. Their love, encouragement, and support carry me along. I’m
so grateful to God, who gives endurance and encouragement (Romans 15:5) and has allowed me to
work on projects like this.
I would also like to dedicate this book to the memory of two teachers who have made an impact
on me:
Mabel “Stoney” Stonecipher, my college technical writing teacher and family friend, who made
writing about technical things fun and educational.
Ron Sabel, my high school biology and physics teacher, who taught me an important lesson: “The
‘A’ student doesn’t have all the answers—the ‘A’ student knows where to find all the answers!”
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Acknowledgments
It has been my great pleasure to work on another Cisco Press project. I enjoy the networking field
very much, and technical writing even more. And more than that, I’m thankful for the joy and inner
peace that Jesus Christ gives, making everything more abundant.
Technical writing may be hard work, but I’m finding that it’s also quite fun because I’m working
with very good friends. I can’t say enough good things about Chris Cleveland. Somehow, Chris is
able to handle many book projects all at once, while giving each one an incredible amount of
attention and improvement. Brett Bartow is a constant source of organization, project management,
and encouragement. I’m glad he agreed to have me back for another project!
Now a few words about another group of good friends—the technical reviewers that made this a
much, much better book. I am very grateful for the insight, suggestions, and helpful comments that
Steve Daleo, Steve McQuerry, and Geoff Tagg contributed. Each one offered a different perspective,
which helped make this a more well-rounded book and me a more educated author. Christopher
Paggen also provided some early help with new Catalyst features and development.
Lastly, for the very first time, I am able to announce that no laptop computers were harmed in the
writing of this book.
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Contents at a Glance
Foreword xxiii
Introduction: Overview of Certification and How to Succeed xxiv
PART I Overview and Design of a Campus Network 2
Chapter 1 Campus Network Overview 5
Chapter 2 Modular Network Design 33
PART II Building a Campus Network 54
Chapter 3 Switch Operation 57
Chapter 4 Switch Configuration 83
Chapter 5 Switch Port Configuration 107
Chapter 6 VLANs and Trunks 137
Chapter 7 VLAN Trunking Protocol (VTP) 167
Chapter 8 Aggregating Switch Links 189
Chapter 9 Traditional Spanning Tree Protocol 209
Chapter 10 Spannning Tree Configuration 239
Chapter 11 Protecting the Spanning Tree Protocol Topology 263
Chapter 12 Advanced Spanning Tree Protocol 279
PART III Layer 3 Switching 302
Chapter 13 Multilayer Switching 305
Chapter 14 Router Redundancy and Load Balancing 327
Chapter 15 Multicast 353
PART IV Campus Network Services 374
Chapter 16 Quality of Service Overview 377
Chapter 17 DiffServ QoS Configuration 401
Chapter 18 IP Telephony 431
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Chapter 19 Securing Switch Access 451
Chapter 20 Securing with VLANs 469
PART V Scenarios for Final Preparation 494
Chapter 21 Scenarios for Final Preparation 497
PART VI Appendix 514
Appendix A Answers to Chapter “Do I Know This Already?” Quizzes and Q&A
Sections 517
Index 582
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Contents
Foreword xxiii
Introduction: Overview of Certification and How to Succeed xxiv
Part I Overview and Design of a Campus Network 2
Chapter 1 Campus Network Overview 5
“Do I Know This Already?” Quiz 5
Foundation Topics 9
Switching Functionality 9
Layer 2 Switching 10
Layer 3 Routing 10
Layer 3 Switching 11
Layer 4 Switching 12
Multilayer Switching (MLS) 12
Campus Network Models 12
Shared Network Model 13
LAN Segmentation Model 14
Network Traffic Models 17
Predictable Network Model 19
Hierarchical Network Design 19
Access Layer 20
Distribution Layer 21
Core Layer 21
Cisco Products in the Hierarchical Design 21
Access Layer Switches 22
Distribution Layer Switches 23
Core Layer Switches 24
Product Summary 25
Foundation Summary 27
Q&A 30
Chapter 2 Modular Network Design 33
“Do I Know This Already?” Quiz 33
Foundation Topics 37
Modular Network Design 37
The Switch Block 38
Sizing a Switch Block 39
The Core Block 41
Collapsed Core 42
Dual Core 43
Core Size in a Campus Network 45