March 1999

Welcome to Cisco PressWelcome to the employee only Cisco Press web site. The above "Welcome" page link presents aFAQ sheet for Cisco Press, including information about how you can buy Cisco Press books!.

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As source material becomes available from the publisher, the complete text of each Cisco Presspublication will be presented here for use by Cisco employees. Sample chapters are presented at thepublic site hosted by Cisco.

Design and ImplementationPublications focusing on network design and implementation strategies.

Internet Routing ArchitecturesISBN: 1-56205-652-2By Bassam HalabiExplores the ins and outs of interdomainrouting network designs.

Designing Campus NetworksISBN: 1-57870-030-2By Terri Quinn-Andry and Kitty HallerFocuses on designing scalable networkssupporting campus LAN traffic.

OSPF Network Design SolutionsISBN: 1-57870-046-9By Thomas M. Thomas IIPresents detailed, applied coverage of OpenShortest Path First protocol.

Internetworking SNA with Cisco RoutersISBN: 1-57870-083-3By George Sackett and Nancy SackettProvides comprehesive coverage of terms,architectures, protocols, and implementationsfor internetworking SNA. Content notavailable.

Residential BroadbandISBN: 1-57870-020-5By George AbePresents emerging high-bandwidth accessnetwork issues.

Cisco Router ConfigurationISBN: 1-57870-022-1By Allan Leinwand and Bruce PinskyPresents router deployment tips fromlong-time Cisco experts.

Top-Down Network DesignISBN: 1-57870-069-8By Priscilla OppenheimerLearn a network design methodology basedon standard techniques for structured systemsanalysis.

Cisco Press Internal Home Page

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Cisco Career Certification and TrainingPublications developed in cooperation with Cisco Worldwide Training that support Cisco's CareerCertification and customer training initiatives.

Introduction to Cisco RouterConfiguration (ICRC)ISBN: 1-57870-076-0Edited by Laura ChappellBased on the Cisco course, presents readerswith the concepts and commands required toconfigure Cisco routers. Content notavailable.

Cisco CCNA Preparation LibraryISBN: 1-57870-125-2By Cisco Systems, Inc.Bundle includes two publications:Introduction to Cisco Router Configurationand Internetworking TechnologiesHandbook, Second Edition (plusHigh-Performance Solutions for DesktopConnectivity in CD-ROM format). Contentnot available.

Advanced Cisco Router Configuration(ACRC)ISBN: 1-57870-074-4Edited by Laura ChappellAdvanced guide focuses on scalableoperation in large and/or growingmultiprotocol internetworks.

Cisco Certified Internetwork Expert (CCIE)Professional Development SeriesPublications supporting Cisco's CCIE program.

Cisco CCIE Fundamentals: NetworkDesign and Case StudiesISBN: 1-57870-066-3By Cisco StaffNetwork design fundamentals and caseexamples assembled to help prepare CCIEcandidates.

CCIE Professional Development: RoutingTCP/IPISBN: 1-57870-041-8By Jeff DoyleCovers basics through details of each IProuting protocol. Essential reading! Contentnot available.

Networking FundamentalsSupport publications providing technology and configuration basics.

Internetworking Technologies Handbook(2nd Edition)ISBN: 1-56205-102-8By Cisco Staff and Kevin DownesSurvey of technologies and protocols.

Internetworking TroubleshootingHandbookISBN: 1-56205-024-8By Cisco Staff and Kevin DownesSummarizes connectivity and performanceproblems, helps develop a strategy forisolating problems. Content not available.

IP Routing PrimerISBN: 1-57870-108-2By Robert WrightTechnical tips and hints focusing on howCisco routers implement IP functions.

IP Routing FundamentalsISBN: 1-57870-071-XBy Mark SportackProvides a detailed examination of routersand the common IP routing protocols.



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Copyright 1988-1999 © Cisco Systems, Inc.



Internetworking FundamentalsIP Routing Fundamentals●

IP Routing Primer●

Internetworking Technologies Handbook (2nd Edition)●


Internetworking Fundamentals

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IP Routing PrimerPreface●

Topology and Router Configurations●

Routing Metrics and Distances●

Discontiguous Networks, Summarization, and Subnet 0●

Using IP Unnumbered and VLSM●

Default Routing●

IP Troubleshooting Scenarios●

Bridging IP Between Dissimilar Media●

Hexadecimal and Binary Numbering and IP Addressing●

Appendix A: RFCs●


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Table of Contents

Introduction

IntroductionRouting is simultaneously the most complicated function of a network and the most important. Mostknowledgeable people agree that networking and routing technologies have been around about 25 years.The concept of routing actually dates back to the late 1950s, when computing was still an arcane sciencein its infancy. Precious few organizations had a single computer, much less multiple computers thatneeded to be linked together. Internetworking, the interconnection of multiple computers, was still moreof a futuristic vision than a reality. This vision predicted a day when computers would be widelyimplemented and interconnected via a ubiquitous global internetwork: the Internet.

The challenge in building and using a global internetwork is developing the means to find, access, andcommunicate with remote hosts. Ostensibly, a global internetwork would offer redundancy. In otherwords, there could be many different physical paths through a network between any given pair of hosts.Mechanisms would be needed that could discover remote networks and hosts and explore the differentpossible paths (or routes) through the network to those networks and hosts.

Finally, some way to apply either logic or mathematics would be needed. Logically, if there are manydifferent routes to a specific destination, they can't all be equal. Some routes would likely offer eithershorter overall paths or better performance than others. Thus, it would be logical to compare all thepossible routes and then select the best route or routes. In time, these mechanisms would become knownas routers. The process of discovering, calculating, and comparing routes to remote networks and hosts isrouting.

This book will help you explore the mechanics of routers and routed and routing protocols, and buildinternetworks using routing technologies. Although this book was designed primarily for the novice, itcontains detailed technical examinations of many of today's leading routing protocols. Theseexaminations are sufficiently detailed to be valuable to technical professionals at all levels of expertise.Consequently, you will find this book an indispensable technical reference long after you have masteredthe basic theory and mechanics of routing and routing protocols.

Part I of this book, "Internetworking Fundamentals," provides an overview of internetworking, includingthe implications of using routers in both LANs and WANs. This overview is provided using the InternetProtocol (IP), which is the predominant routed protocol in use today. IP has grown substantially since itsinception approximately two decades ago. Its once simple addressing architecture has become quitecomplicated during its life. An entire chapter is devoted to examining IP's addressing. This includes theoriginal class-based address architecture, subnet numbers, and classless interdomain routing (CIDR)addresses. This chapter also provides a glimpse at how IP's addresses will change with the IPv6, the next

Introduction

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network - ip routing fundamentals - cisco press

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