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Cisco Router Configuration,Second EditionAllan LeinwandBruce Pinsky, CCIE #1045Cisco Press201 West 103rd StreetIndianapolis, IN 46290 USA

iiCisco Router Configuration, Second EditionAllan Leinwand and Bruce PinskyCopyright 2001 Cisco PressCisco Press logo is a trademark of Cisco Systems, Inc.Published by:Cisco Press201 West 103rd StreetIndianapolis, IN 46290 USAAll rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronicor 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 04 03 02 01First Printing December 2000Library of Congress Cataloging-in-Publication Number: 00-109754ISBN: 1-57870-241-0Warning and DisclaimerThis book is designed to provide information about Cisco router configuration. Every effort has been made to makethis 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 author, Cisco Press, and Cisco Systems, Inc., shall have neitherliability nor responsibility to any person or entity with respect to any loss or damages arising from the informationcontained 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 AcknowledgmentsAll 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 bookshould not be regarded as affecting the validity of any trademark or service mark.Feedback InformationAt Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each book is craftedwith care and precision, undergoing rigorous development that involves the unique expertise of members from theprofessional technical community.Readers’ feedback is a natural continuation of this process. If you have any comments regarding how we couldimprove the quality of this book or otherwise alter it to better suit your needs, you can contact us through e-mail atciscopress@mcp.com. Please make sure to include the book title and ISBN in your message.We greatly appreciate your assistance.

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ivAbout the AuthorsAllan Leinwand is the Chief Technology Officer and Vice President of Engineering at Telegis Networks, Inc.Previously, as Chief Technology Officer and Vice President of Engineering for Digital Island, Inc., he was responsible forthe technical direction of the company’s global network and content distribution strategy. Before Digital Island, he was aConsulting Engineering Manager at Cisco Systems, Inc., responsible for the global network design of customer networks.Allan received his BS in Computer Science at the University of Colorado at Boulder in 1988, and has been working ininternetworking technology and solutions for large corporations since that time. He teaches graduate computer networking courses for the University of California, Berkeley; has published many papers on network management and networkdesign; and is the co-author of the Addison-Wesley text Network Management: A Practical Perspective, Second Edition.Bruce Pinsky, CCIE #1045, is the Vice President of Product Engineering and Network Infrastructure at Telegis Networks, Inc. Previously, as Chief Information Officer, Vice President of Solutions Engineering, and Chief Network Strategist of Digital Island, Inc., he was responsible for the direction and deployment of corporate technology infrastructure andadvanced technology research. Before Digital Island, Bruce was a Senior Internetwork Support Technologist at CiscoSystems, Inc., and was responsible for the escalation of complex customer technical issues. He received his BS in Computer Science at California State University, Hayward, in 1988, and he has been working in internetworking technologyand systems integration for large corporations and consulting firms before and since that time. One of the original CiscoCertified Internetwork Engineers, Bruce has expertise in such topics as network troubleshooting and protocol analysis,network design and configuration, and workstation and server-based operating systems. He routinely teaches courses onnetwork configuration, design, and troubleshooting, and is co-inventor of patented routing technology.About the Technical ReviewersHenry Benjamin, CCIE, CCNA, CCDA, B. Eng., is a Cisco Certified Internetwork Expert and an IT network engineerfor Cisco Systems, Inc. He has more than 10 years of experience in Cisco networks, including planning, designing, andimplementing large IP networks running IGRP, EIGRP, and OSPF. In the past year, Henry has focused on architecturaldesign and implementation in Cisco internal networks across Australia and the Asia/Pacific region. He is the author of abook dedicated to passing the CCIE written exam and has helped with many other titles related to Cisco IOS. Henryholds a Bachelor of Engineering Degree from Sydney University. This review is dedicated to his sick mum.Kevin Burgess has been doing network design, analysis, and maintenance for the past 10 years. As a NetworkEngineer with EDS for the past five years, he has worked on various projects across Canada. Kevin holds certifications from Novell and Cisco and is currently working on his CCIE.André Paree-Huff, CCNP, MCSE I, ASE, A , Network , I-Network , has been working in the computer field formore than 8 years. He is currently working for Compaq Computer Corporation as a Network Support Engineer, LevelIII, for the North America Customer Support Center in Colorado Springs, Colorado. André handles troubleshooting ofnetwork hardware, specializing in Layers 2 and 3 of the OSI model. André has co-authored four network-related technical manuals and has been a technical editor on many others. He is currently working toward his CCIE.Dave Sumter, CCIE #4942, CCDP, has been in the networking industry for close to five years and has been concentrating solely on Cisco solutions for the last three years He works for Cisco Systems, Inc., in South Africa. Dave’scurrent duties involve the design of large-scale campus and WAN solutions for corporate and government clients inSouth Africa. Other duties involve the ongoing training of Cisco partners and participation in the examination ofCCIE candidates at the CCIE routing and switching lab in South Africa.Michael Truett, CCNP, is a network engineer for a large organization specializing in VoIP. He is currently workingon his CCDP and CCIE. His strength lies in the area of network design, implementation, and troubleshooting forlarge networks on many different media types, including Frame Relay and satellite. In his spare time, Michael alsoteaches several classes on Cisco routers and switches.

vDedicationsAllan Leinwand would like to dedicate this book to his family and friends, who have provided continual support,suggestions, encouragement, and insights throughout the writing of this book.Bruce Pinsky would like to thank all his friends and family, who have provided their support in helping to make thisbook a reality. An extra special thank you goes to his wife, Paula, and sons, Eric and Kyle, for their tireless supportduring the many nights and weekends dedicated to the completion of this text.

viAcknowledgmentsWe would like to say thank you to the diligent and persistent efforts of Tracy Hughes, the entire Cisco Press staff,and our technical reviewers in helping to complete this book.

viiContents at a GlanceChapter 1Getting Started in Internetworking2Chapter 2The Basics of Device ConfigurationChapter 3The Basics of Device InterfacesChapter 4TCP/IP BasicsChapter 5AppleTalk BasicsChapter 6IPX BasicsChapter 7Basic Administrative and Management IssuesChapter 8Comprehensive IOS Configuration for the ZIP NetworkIndex322184682196236266294