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CCNP 642-811 BCMSN Exam Certification Guide - Cisco press

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CCNP Self-Study


Certification Guide

David Hucaby, CCIE No. 4594

Cisco Press

Cisco Press

800 East 96th Street, 3rd Floor Indianapolis, IN 46240 USA


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

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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.

Publisher: John Wait

Editor-In-Chief: John Kane

Executive Editor: Brett Bartow

Cisco Representative: Anthony Wolfenden

Cisco Press Program Manager: Sonia Torres Chavez

Manager, Marketing Communications,

Cisco Systems: Scott Miller

Cisco Marketing Program Manager: Edie Quiroz

Production Manager: Patrick Kanouse


Development Editor: Christopher Cleveland

Project Editor: San Dee Phillips

Copy Editor: Marcia Ellett

Technical Editors: Stephen Daleo, Steve McQuerry, Geoff Tagg

Team Coordinator: Tammi Ross

Book Designer: Gina Rexrode

Cover Designer: Louisa Adair

Indexer: Tim Wright

Composition: Octal Publishing, Inc.


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.


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.



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!”



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.


Contents at a Glance











Introduction: Overview of Certification and How to Succeed xxiv


Overview and Design of a Campus Network 2

Chapter 1

Campus Network Overview




Chapter 2

Modular Network Design





Building a Campus Network



Chapter 3

Switch Operation







Chapter 4

Switch Configuration






Chapter 5

Switch Port Configuration




Chapter 6

VLANs and Trunks






Chapter 7

VLAN Trunking Protocol (VTP)



Chapter 8

Aggregating Switch Links




Chapter 9

Traditional Spanning Tree Protocol


Chapter 10

Spannning Tree Configuration



Chapter 11

Protecting the Spanning Tree Protocol Topology 263

Chapter 12

Advanced Spanning Tree Protocol



Layer 3 Switching






Chapter 13

Multilayer Switching






Chapter 14

Router Redundancy and Load Balancing 327

Chapter 15










Campus Network Services




Chapter 16

Quality of Service Overview



Chapter 17

DiffServ QoS Configuration



Chapter 18

IP Telephony 431








Chapter 19

Securing Switch Access 451


Chapter 20

Securing with VLANs 469



Scenarios for Final Preparation


Chapter 21

Scenarios for Final Preparation






Appendix A

Answers to Chapter “Do I Know This Already?” Quizzes and Q&A









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