cisco.press.ospf.network.design.solutions.2nd.ed.pdf

0323FMf.book Page i Wednesday, March 12, 2003 9:41 AM

OSPF Network Design Solutions

Second Edition

Thomas M. Thomas II, CCIE No. 9360

Cisco Press

201 West 103rd Street

Indianapolis, IN 46290 USA

0323FMf.book Page ii Wednesday, March 12, 2003 9:41 AM

OSPF Network Design Solutions, Second Edition

Thomas M. Thomas II

Published by:

Cisco Press

201 West 103rd Street

Indianapolis, IN 46290 USA

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 April 2003

Library of Congress Cataloging-in-Publication Number: 2001095162

ISBN: 1-58705-032-3

Warning and Disclaimer

This book is designed to provide information about the Open Shortest Path First (OSPF) protocol. 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.

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 precision, 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 this book, or otherwise alter it to better suit your needs, you can contact us through email at

feedback@ciscopress.com. Please make sure to include the book title and ISBN in your message.

We greatly appreciate your assistance.

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iii

Publisher

John Wait

Editor-In-Chief

John Kane

Cisco Representative

Anthony Wolfenden

Cisco Press Program Manager

Sonia Torres Chavez

Manager, Marketing Communications, Cisco Systems

Scott Miller

Cisco Marketing Program Manager

Edie Quiroz

Executive Editor

Brett Bartow

Acquisitions Editor

Amy Moss

Production Manager

Patrick Kanouse

Development Editor

Christopher Cleveland

Project Editor

San Dee Phillips

Copy Editor

Progressive Publishing Alternatives

Technical Editors

Henry Benjamin, Matthew Birkner, Rick Burts,

Daniel Golding, John Hammond, Cary Riddock

Team Coordinator

Tammi Ross

Book Designer

Gina Rexrode

Cover Designer

Louisa Adair

Indexer

Tim Wright

0323FMf.book Page iv Wednesday, March 12, 2003 9:41 AM

is a self-proclaimed Network Emergency Repair Dude, or NERD for short, and a country

boy who is CCIE No. 9360 as well as being a certiﬁed Cisco Systems instructor and holding CCNP, CCDA, and

CCNA certiﬁcations and claims he never works because he loves what he does. Tom is the founder of NetCerts.com

(now CCPrep.com) and the International Network Resource Group (www.inrgi.net ) where he remains on the board

of directors in an advisory capacity, providing vision and focus. He was previously an Instructor for Chesapeake

Computer Consultants, Inc. (CCCI), and a course developer for Cisco Systems. He has also authored the ﬁrst edition

of OSPF Network Design Solutions and a variety of other networking books designed to help his fellow engineers.

Tom is currently working as a senior network consultant designing and implementing Voice-over-IP and Data networks

wherever he can as a part of US Networks, Inc. (www.usnetworksinc.com). Tom currently lives in Raleigh, NC,

with his family, and although he is not in the country, he humorously observes that you can see it from his home.

, CCIE No. 4695, holds three CCIE certiﬁcations (Routing and Switching, ISP Dial, and Communica-

tion and Services). Formerly with the Cisco Systems CCIE global team, Henry is now an independent consultant for

a large security ﬁrm in Australia. He has served as a proctor for the CCIE Lab exams and is the author of CCNP

Practical Studies: Routing from Cisco Press and CCIE Routing and Switching Exam Cram from Coriolis.

Matthew H. Birkner , CCIE No. 3719, is a technical leader at Cisco Systems, specializing in IP and MPLS network

design. He has inﬂuenced multiple large carrier and enterprise designs worldwide. Matt has spoken at Cisco Networkers

on MPLS VPN technologies in both the United States and EMEA over the past few years. Matt, a “Double CCIE,”

authored the Cisco Press book, Cisco Internetwork Design . Matt holds a B.S.E.E. from Tufts University, where he

majored in electrical engineering.

Rick Burts , CCIE No. 4615, has over 20 years experience with computers and computer networks. Rick is a certiﬁed

Cisco Systems instructor and a CCIE (Routing/Switching). He has taught a variety of Cisco courses and helped

develop an OSPF course for Mentor Technologies. Rick is a consultant and has helped many customers with OSPF as their

network routing protocol. He is a senior consultant with Chesapeake NetCraftsmen (www.netcraftsmen.net). In his current

position, Rick deals with network design, implementation, and troubleshooting issues and teaches a few courses.

Daniel L. Golding is peering manager in America Online’s Internet Architecture group. Dan is responsible for

ensuring worldwide Internet connectivity for all AOL Time Warner subscribers and properties. His particular areas

of expertise include internetwork peering and routing policy design. He has a long history of involvement with various

Internet service providers, particularly in the area of backbone engineering. Dan is also a frequent speaker at North

American Network Operator’s Group (NANOG) meetings and has been a network engineer for over six years.

John Hammond has been an instructor and course developer for Juniper Networks for the past two years. Prior to

that he was a member of the teaching staff of Chesapeake Computer Consultants, Inc., a Cisco Training Partner.

John has been involved in many aspects of networks since 1990.

Cary Riddock , CCNP, CSS1, has worked as an network engineer for some of the largest companies in Houston,

Texas and Central Florida over the last six years. He is very active in the IT Security Field and is currently pursuing

CCSP and CISSP certiﬁcations. His resume includes co-authoring MCNS for Cisco Press and is a contributing

author for various network security publications.

About the Author

Thomas M. Thomas II

About the Technical Reviewers

Henry Benjamin

0323FMf.book Page v Wednesday, March 12, 2003 9:41 AM

Dedications

I want to dedicate this book to my family for their ever-faithful support and understanding during the many nights

and weekends I spent writing. An extra special thank you goes to my wife Rose, daughter Rebekah, and son Daniel

who never voiced anything but encouragement and support.

Without the support of my family and their faith in me I would never have been able to completely rewrite this

book.

I had my faith in the Lord and the knowledge that my family knew I could improve upon my book in this new edition

to keep me going.

I want to reafﬁrm a few words of special meaning to my wife and I who have been married for over 15 years…

Always

Forever

Endlessly

Until Eternity

Acknowledgments

I am very grateful to the group of talented people that were assembled to make this book a reality. Through their

knowledge, dedication, and hard work, this book has become more than I ever thought possible.

The most important acknowledgment must go to my wife, Rose, who put up with me writing all night after working

all day. Her unwavering support was the single greatest factor in my ability to complete the book you now hold in

your hands.

Writing this book allowed me to assemble a team of technical professionals who have helped me make this book

more than I thought possible. I had the privilege to be a part of an awesome team during this time. Thank you all for

your insight and friendship.

I have to recognize the extraordinary group of publishing professionals who helped guide me through the process:

Amy Moss, a true and dear friend of many years now; and Chris Cleveland who is always busy but always has time

to help me.

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