Routing TCP/IP / Edition 2

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A detailed examination of interior routing protocols -- completely updated in a new edition

  • A complete revision of the best-selling first edition--widely considered a premier text on TCP/IP routing protocols
  • A core textbook for CCIE preparation and a practical reference for network designers, administrators, and engineers
  • Includes configuration and troubleshooting lessons that would cost thousands to learn in a classroom and numerous real-world examples and case studies

Praised in its first edition for its approachable style and wealth of information, this new edition provides readers a deep understanding of IP routing protocols, teaches how to implement these protocols using Cisco routers, and brings readers up to date protocol and implementation enhancements. Routing TCP/IP, Volume 1, Second Edition, includes protocol changes and Cisco features that enhance routing integrity, secure routers from attacks initiated through routing protocols, and provide greater control over the propagation of routing information for all the IP interior routing protocols. Routing TCP/IP, Volume 1, Second Edition, provides a detailed analysis of each of the IP interior gateway protocols (IGPs). Its structure remains the same as the best-selling first edition, though information within each section is enhanced and modified to include the new developments in routing protocols and Cisco implementations. What's New In This Edition? The first edition covers routing protocols as they existed in 1998. The new book updates all covered routing protocols and discusses new features integrated in the latest version of Cisco IOS Software. IPv6, its use with interior routing protocols, and its interoperability and integration with IPv4 are also integrated into this book. Approximately 200 pages of new information are added to the main text, with some old text removed. Additional exercise and solutions are also included.

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Product Details

  • ISBN-13: 9781587052026
  • Publisher: Cisco Press
  • Publication date: 10/19/2005
  • Series: CCIE Professional Development Series
  • Edition description: REV
  • Edition number: 2
  • Pages: 936
  • Sales rank: 949,835
  • Product dimensions: 7.70 (w) x 9.40 (h) x 2.14 (d)

Meet the Author

Jeff Doyle, CCIE No. 1919, is a professional services engineer and IPv6 solutions manager. Specializing in IP routing protocols, MPLS, and IPv6, Jeff has designed or assisted in the design of large-scale carrier and services provider networks in North America, Europe, and Asia.

Jennifer Carroll, CCIE No. 1402, is an indepedent network consultant in Redmond, WA. She has designed and implemented many TCP/IP networks and has developed and taught a variety of courses on routing protocols and Cisco routers.

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Table of Contents

Part I Routing Basics

Chapter 1 TCP/IP Review

TCP/IP Protocol Layers

IP Packet Header

IPv4 Addresses

First Octet Rule

Address Masks

Subnets and Subnet Masks

Designing Subnets

Breaking the Octet Boundary

Troubleshooting a Subnet Mask

Address Resolution Protocol (ARP)

Proxy ARP

Gratuitous ARP

Reverse ARP

Internet Control Message Protocol (ICMP)

Host-to-Host Layer



Looking Ahead

Summary Table: Chapter 1 Command Review

Recommended Reading

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 2 IPv6 Overview

IPv6 Addresses

Address Representation

IPv6 Address Types

Global Unicast Addresses

Identifying IPv6 Address Types

Local Unicast Addresses

Anycast Addresses

Multicast Addresses

Embedded IPv4 Addresses

IPv6 Packet Header Format

Extension Headers


Neighbor Discovery Protocol

NDP Messages

Router Discovery

Address Autoconfiguration

Duplicate Address Detection

Neighbor Address Resolution

Privacy Addresses

Neighbor Unreachability Detection

Looking Ahead

Review Questions

Chapter 3 Static Routing

Route Table

Configuring Static Routes

Case Study: Simple IPv4 Static Routes

Case Study: Simple IPv6 Static Routes

Case Study: Summary Routes

Case Study: Alternative Routes

Case Study: Floating Static Routes

Case Study: IPv6 Floating Static Routes

Case Study: Load Sharing

Load Sharing and Cisco Express Forwarding

Per Destination Load Sharing and Fast Switching

Per Packet Load Sharing and Process Switching

Which Switching Method Will Be Used?

Case Study: Recursive Table Lookups

Troubleshooting Static Routes

Case Study: Tracing a Failed Route

Case Study: A Protocol Conflict

Case Study: A Replaced Router

Case Study: Tracing An IPv6 Failed Route

Looking Ahead

Summary Table: Chapter 3 Command Review

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 4 Dynamic Routing Protocols

Routing Protocol Basics

Path Determination


Hop Count







Load Balancing

Distance Vector Routing Protocols

Common Characteristics

Periodic Updates


Broadcast Updates

Full Routing Table Updates

Routing by Rumor

Route Invalidation Timers

Split Horizon

Counting to Infinity

Triggered Updates

Holddown Timers

Asynchronous Updates

Link State Routing Protocols


Link State Flooding

Sequence Numbers


Link State Database

SPF Algorithm


Interior and Exterior Gateway Protocols

Static or Dynamic Routing?

Looking Ahead

Recommended Reading

Review Questions

Part II Interior Routing Protocols

Chapter 5 Routing Information Protocol (RIP)

Operation of RIP

RIP Timers and Stability Features

RIP Message Format

Request Message Types

Classful Routing

Classful Routing: Directly Connected Subnets

Classful Routing: Summarization at Boundary Routers

Classful Routing: Summary

Configuring RIP

Case Study: A Basic RIP Configuration

Case Study: Passive Interfaces

Case Study: Configuring Unicast Updates

Case Study: Discontiguous Subnets

Case Study: Manipulating RIP Metrics

Case Study: Minimizing the Impact of Updates

Troubleshooting RIP

Looking Ahead

Summary Table: Chapter 5 Command Review

Recommended Reading

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 6 RIPv2, RIPng, and Classless Routing

Operation of RIPv2

RIPv2 Message Format

Compatibility with RIPv1

Classless Route Lookups

Classless Routing Protocols

Variable-Length Subnet Masking


Operation of RIPng

Configuring RIPv2

Case Study: A Basic RIPv2 Configuration

Case Study: Compatibility with RIPv1

Case Study: Using VLSM

Case Study: Discontiguous Subnets and Classless Routing

Case Study: Authentication

Configuring RIPng

Case Study: Basic RIPng Configuration

Case Study: RIPng Process Customization

Case Study: Metric Manipulation

Case Study: Route Summarization

Troubleshooting RIPv2 and RIPng

Case Study: Misconfigured VLSM

Looking Ahead

Summary Table: Chapter 6 Command Review

Recommended Reading

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 7 Enhanced Interior Gateway Routing Protocol (EIGRP)

The Roots of EIGRP: An Overview of IGRP

Process Domains

IGRP Timers and Stability Features

IGRP Metrics


Operation of EIGRP

Protocol-Dependent Modules

Reliable Transport Protocol

Neighbor Discovery/Recovery

Diffusing Update Algorithm

DUAL: Preliminary Concepts

DUAL Finite State Machine

Diffusing Computation: Example 1

Diffusing Computation: Example 2

EIGRP Packet Formats

EIGRP Packet Header

General TLV Fields

IP-Specific TLV Fields

Address Aggregation

EIGRP and IPv6

Configuring EIGRP

Case Study: A Basic EIGRP Configuration

Case Study: Unequal-Cost Load Balancing

Case Study: Setting Maximum Paths

Case Study: Multiple EIGRP Processes

Case Study: Disabling Automatic Summarization

Case Study: Stub Routing

Case Study: Address Summarization


Troubleshooting EIGRP

Case Study: A Missing Neighbor

Stuck-in-Active Neighbors

Looking Ahead

Summary Table: Chapter 7 Command Review

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 8 OSPFv2

Operation of OSPF

Neighbors and Adjacencies

Hello Protocol

Network Types

Designated Routers and Backup Designated Routers

OSPF Interfaces

OSPF Neighbors



Router Types

Partitioned Areas

Virtual Links

Link-State Database

LSA Types

Stub Areas

Route Table

Destination Types

Path Types

Route Table Lookups


OSPF over Demand Circuits

OSPF Packet Formats

Packet Header

Hello Packet

Database Description Packet

Link State Request Packet

Link State Update Packet

Link State Acknowledgment Packet

OSPF LSA Formats

LSA Header

Router LSA

Network LSA

Network and ASBR Summary LSAs

Autonomous System External LSA

NSSA External LSA

Options Field

Configuring OSPF

Case Study: A Basic OSPF Configuration

Case Study: Setting Router IDs with Loopback Interfaces

Case Study: Domain Name Service Lookups

Case Study: OSPF and Secondary Addresses

Case Study: Stub Areas

Case Study: Totally Stubby Areas

Case Study: Not-So-Stubby Areas

Case Study: Address Summarization

Case Study: Filtering Between Areas

Case Study: Authentication

Case Study: Virtual Links

Case Study: OSPF on NBMA Networks

Case Study: OSPF over Demand Circuits

Troubleshooting OSPF

Case Study: An Isolated Area

Case Study: Misconfigured Summarization

Looking Ahead

Summary Table: Chapter 8 Command Review

Recommended Reading

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 9 OSPFv3

Operation of OSPFv3

OSPFv3 Differences from OSPFv2

OSPFv3 Messages

An Overview of OSPFv3 LSAs

OSPFv3 LSA Formats

The Router LSA

Network LSA

Inter-Area Prefix LSA

Inter-Area Router LSA

AS-External LSA

Link LSA 489
Intra-Area Prefix LSA

Options Field

Configuring OSPFv3

Case Study: A Basic OSPFv3 Configuration

Case Study: Stub Areas

Case Study: Multiple Instances on a Link

Case Study: OSPFv3 on NBMA Networks

Troubleshooting OSPFv3

Case Study: Frame-Relay Mapping

Looking Ahead 509
Summary Table: Chapter 9 Command Review

Recommended Reading

Review Questions

Configuration Exercises

Chapter 10 Integrated IS-IS

Operation of Integrated IS-IS

IS-IS Areas

Network Entity Titles

IS-IS Functional Organization

Subnetwork Dependent Functions

Subnetwork Independent Functions

IS-IS PDU Formats

TLV Fields

IS-IS Hello PDU Format

IS-IS Link State PDU Format

IS-IS Sequence Numbers PDU Format

Extensions to IS-IS

3-Way Handshaking

Domain-Wide Prefix Distribution

Wide Metrics

Routing IPv6 with IS-IS

Dynamic Hostname Exchange

Multiple Topologies

Mesh Groups

Flooding Delays

Improving SPF Efficiency

Configuring Integrated IS-IS

Case Study: A Basic IPv4 Integrated IS-IS Configuration

Case Study: Changing the Router Types

Case Study: An Area Migration

Case Study: Route Summarization

Case Study: Authentication

Case Study: A Basic Integrated IS-IS Configuration for IPv6

Case Study: Transition to Multiple Topology Mode

Case Study: Route Leaking Between Levels

Case Study: Multiple L1 Areas Active on A Router

Troubleshooting Integrated IS-IS

Troubleshooting IS-IS Adjacencies

Troubleshooting the IS-IS Link-State Database

Case Study: Integrated IS-IS on NBMA Networks

Looking Ahead

Summary Table: Chapter 10 Command Review

Review Questions

Configuration Exercises

Troubleshooting Exercises

Part III Route Control and Interoperability

Chapter 11 Route Redistribution

Principles of Redistribution


Administrative Distances

Redistributing from Classless to Classful Protocols

Configuring Redistribution

Case Study: Redistributing IGRP and RIP

Case Study: Redistributing EIGRP and OSPF

Case Study: Redistribution and Route Summarization

Case Study: Redistributing OSPFv3 and RIPng

Case Study: Redistributing IS-IS and RIP/RIPng

Case Study: Redistributing Static Routes

Looking Ahead

Summary Table: Chapter 11 Command Review

Review Questions

Configuration Exercises

Troubleshooting Exercises

Chapter 12 Default Routes and On-Demand Routing

Fundamentals of Default Routes 677
Fundamentals of On-Demand Routing

Configuring Default Routes and ODR

Case Study: Static Default Routes

Case Study: The Default-Network Command

Case Study: The Default-Information Originate Command

Case Study: Configuring On-Demand Routing

Looking Ahead

Summary Table: Chapter 12 Command Review

Review Questions

Chapter 13 Route Filtering

Configuring Route Filters

Case Study: Filtering Specific Routes

Case Study: Route Filtering and Redistribution

Case Study: A Protocol Migration

Case Study: Multiple Redistribution Points

Case Study: Using Administrative Distances to Set Router Preferences

Looking Ahead

Summary Table: Chapter 13 Command Review

Configuration Exercises

Troubleshooting Exercises

Chapter 14 Route Maps

Basic Uses of Route Maps

Configuring Route Maps

Case Study: Policy Routing

Case Study: Policy Routing and Quality of Service Routing

Case Study: Route Maps and Redistribution

Case Study: Route Tagging

Case Study: Filtering Tagged Routes Out of OSPF Route Table

Case Study: IPv6 Redistribution with Route Maps

Looking Ahead

Summary Table: Chapter 14 Command Review

Review Questions

Configuration Exercises

Troubleshooting Exercise

Part IV Appendixes

Appendix A Tutorial : Working with Binary and Hex

Appendix B Tutorial : Access Lists

Appendix C CCIE Preparation Tips

Appendix D Answers to Review Questions

Appendix E Solutions to Configuration Exercises

Appendix F Solutions to Troubleshooting Exercises


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Customer Reviews

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Sort by: Showing all of 9 Customer Reviews
  • Anonymous

    Posted January 8, 2007

    great book

    this is a compleate book not only for a cisco guy but also for an networking engineer

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  • Anonymous

    Posted July 24, 2006

    Excellent, as Expected

    Routing TCP/IP, Vol 1 - 2nd Edition I have used the first edition of Jeff Doyle¿s Routing TCP/IP volumes 1 and 2 for some time now. I consider them essential to studying for the CCIE lab exam. They also act as an ongoing reference for any networking professional. I was anxious to review the second edition and have not been disappointed. I was impressed that this second edition appears to be a well thought out re-presentation of the material. By that I mean it is not just the first edition with some bolt-on additions but rather a fresh covering of the material with the updates that inundate our industry woven in as opposed to added on to the existing text. I find rare cases to employ RIP in my current work but as an old dog, I tend to monitor its evolution. The book does one of the best jobs of conveying RIPng and its exclusive use with IPv6 that I have seen. An important note that other writers seem to overlook is the reliance of RIPng on IPv6 authentication mechanisms. Coverage of EIGRP¿s approach to IPv6 was lacking but I am told this was due to press dates vs. standards publishing or some such. Separate research for this technology would be required for those that need it. In typical Doyle fashion, information is presented in a very matter of fact way, diagrams are clear and correctly annotated. Command output is easy to follow and well trimmed of content that does not apply directly to the point being illustrated. I have chastised other Cisco Press books for failure to hit this level of clarity and correctness. It is a peeve of mine to have to flip back and forth several pages (or even chapters) to reference a diagram or a table that is being discussed in the current chapter. Overall: As expected I was quite pleased with the book and will recommend it to anyone pursuing their CCIE certification. I will also recommend this book (as I have the first edition) to anyone involved in higher level network design and administration. I heartily give the book five stars as I believe most reviewers will.

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  • Anonymous

    Posted May 18, 2006

    An Absolute Must Have for CCIE Candidates!

    I read the original edition of Jeff Doyle¿s ¿Routing TCP/IP, Volume I¿ (ISBN 1587052024) a few years back while studying from my CCIE. The first edition was a ¿must read¿ for any CCIE candidate. I am happy to say that the second edition improves upon and updates this essential classic in Cisco and network architecture. Let¿s face it, internetworking has evolved tremendously since the original edition was published in 1998. The CCIE lab has also changed enormously since the first edition. For example, gone is IGRP, IPv6 is on the horizon. ¿Routing TCP/IP, Volume I, Second Edition¿ reflects these changes. For new Doyle readers, the book covers the essential Interior Routing Protocols (IGP) for IP version 4 and IPv6, including static routing, RIP (version 1 and 2), EIRGP, OSPF, and IS-IS. The chapter on IGRP from the first edition is dropped, and instead is briefly discussed from a historical perspective in the EIGRP chapter. The second half of the books discussed the intricacies of routing protocol redistribution and introduces the reader to the concepts and uses of distribution lists and route-maps. Readers interested in BGP and Multicast should look to Doyle and Carroll¿s Routing TCP/IP, Volume II (ISBN 1578700892). I especially loved the IPv6 content incorporated throughout the book. Prior to reading this new edition, my knowledge and understanding of IPv6 was at an elementary level. I found Doyle¿s explanation of routing IPv6 and examples to be concise, practical, and very helpful. I was easily able to walk through most of the configuration exercises on my home lab. Guess what, routing IPv6 isn¿t much different than routing IP version 4. Who would have guessed that you could improve upon a classic? If you are a season veteran, the updated version is well worth the purchase price. For the aspiring CCIE, the book is an absolute ¿must have¿. Mark G. Reyero, CCIE 12932

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  • Anonymous

    Posted April 10, 2006

    Another mandatory book for your 'required reading' list

    Doyle¿s first edition of Routing TCP/IP, Volume 1 became the gold standard of TCP/IP routing preparation for prospective CCIE candidates. With the new content of the CCIE lab, the expectation was very high that this book would also become part of a CCIE candidate¿s ¿required reading¿ list. It went on mine. The things I like about this book: While much of the content of this book was first published in the first edition, there were nevertheless many enhancements spread throughout, reflecting on newer IOS versions, newer features, etc. Much changed during the seven year stretch between the two so the second edition was refreshed to reflect that, even though much of the core content stayed the same. Notably, the major additions to this book center on IPv6 and related technologies, such as RIPng and OSPFv3. Doyle has historically shown strong ability to break down technically difficult material and present it in such a way as to appeal to both novice and expert alike. This book did not disappoint as it provided a basic but detailed discussion of IPv6. From addressing to integrated services, the reader will have a firm grasp of IPv6 from a Cisco IOS perspective. The reader will also find numerous references to IPv6 configuration and functionality differences where applicable throughout the other chapters of this book. The first edition of this book was fairly clean as editorial errors are concerned and this edition follows in its footsteps. Certainly there are some minor mistakes here and there but I was not able to identify any that were notable. The things I do not like about this book: This book lived up to my expectations and there was nothing that disappointed me.

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  • Anonymous

    Posted December 17, 2005

    Great Text

    Jeff Doyle has done it again. Routing TCP/IP Volume I second edition has reaffirmed Jeff and Jennifer¿s excellent pedagogical prowess, with the TCP/IP routing framework. When I read routing TCP/IP volumes I and II several years ago, the excellent presentation of the various routing protocols in a clear case study driven manner helped me develop a firm understanding of the various interior and exterior routing protocols available for TCP/IP. TCP/IP Volume I second edition is a more concise edition of the first edition with several new chapters on IP version 6 specific protocols. Unlike the 14 chapter, 1026 pages long first edition, the second edition is organized into 14 chapters also but is 910 pages long and comes with a 45 day free online access at safari book online. That¿s a great deal. The organization of this edition is similar to the first Part I deals with basic concepts, Part II with interior routing protocols and part three discusses routing controls and interoperability. Part IV is a collection of appendices and solutions to problems discussed throughout the text. Part one now includes an expanded review of IP version 6 in a chapter by itself. This is arguably one of the better treatments of the subject I have seen in a text and provides a concise introduction to IP version 6 protocol headers, control protocols and addressing. Part two includes an expanded treatment of RIP version 2 as well as the new RIPng which is an RIP implementation for IP v6. The now deprecated IGRP has been dropped and a totally new chapter on OSPF version 3 explains the updated OSPF for IP v6. Part three, like one and two also includes updated and new case studies to reflect current and future trends. A new case study on IP version 6 redistribution with route maps shows a simple example of route redistribution from RIPng to IS-IS for IP v6 networks. Like previous Doyle¿s work, this book is heavily invested in sample configurations using Cisco IOS, but the clear treatment of technology theories and directions make this book a great reference for all internetworking engineers out there. The clear and detailed presentation of the materials make this book accessible to networking professionals of all grade, newbie to experts alike. And as organizations prep themselves for the inevitable migration to IP v6 , Jeff Doyle¿s book is definitely an additional resource for the engineers whose job it will be to provision the change. Definitely not the be all book on TCP/IP , the book will likely become a key ingredient in the arsenal of network managers, administrators and even researches and an excellent guide to Cisco network professionals and students. If anything, I will recommend this volume, and highly so, to aspiring Cisco Certification candidates and anyone who already owns or have read the first edition. This edition is indeed an upgrade.

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  • Anonymous

    Posted December 21, 2005

    Perhaps The Best Overall Book on Routing

    Routing TCP/IP Volume I, Second Edition is the best single book on interior routing protocols I have ever read. Not for an absolute beginner, nor for someone who just wants to know about routing, this 900 page tome is for the intermediate to advanced technician who configures routers for a living. The volume is on the CCIE official reading list and the first edition has been mentioned by many other authors as ¿the¿ definitive work for this subject. The theory of why and how interior routing protocols work is covered thoroughly, yet at a pace that progresses the reader to a thorough understanding. Doyle and Carrroll's teaching deserves a slow methodical reading of their rich treatment of RIP, EIGRP, OSPF, and ISIS in both IP version 4 and 6. The latest RFCs on IPV6 are referred to and one entire chapter is dedicated to the future transport language of the Internet. The intro chapters are pure theory covering Link State or Distance Vector protocols in an almost scientific manner. From Chapter 5 on there is a nice pattern of explaining the particulars of one protocol at a time with a unique emphasis on 'why' it works that way. There are case studies, command lists, configuration practice and trouble shooting exercises. After fourteen information packed chapters, there are still six appendices including tutorials and solutions to the chapter questions and case studies. I rank Routing TCP/IP Volume I, Second Edition as a five star book. It is worth several books because of its size and depth. The only thing that might be better would be to have each of the authors of the RFCs write explanatory notes in a readable format and compile them into one volume.

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  • Anonymous

    Posted November 22, 2005

    Jeff does it again!!!

    The second edition of the book was a long felt need as there have been a lot of changes in the CCIE certification blueprint as well the Cisco IOS. This is the most highly recommended book for anyone attempting to study for any of the CCIE certifications as Routing and Switching are covered in varying degrees in all the CCIE written Exams. The detailed coverage of IPV6 is a highpoint of this book as it is very well explained with the help of various examples and also by comparing and contrasting it with IPV4 so as to bring out the true subtleness of and the glaring differences between the two. By showing how each task is done differently with IPV6 makes the difficult and confusing address scheme which is in hex much more understandable. Through out the book where ever applicable the authors use IPV6 addresses during various configuration examples to clarify the concepts. The principles of route redistribution are explained with the help of case studies and sample output which make this usually difficult to understand and confusing topic much more bearable. Redistribution remains the cause of most problems in the lab and once routes are redistributed a variety of problems crop up. Jeff explains the right way to do this and most importantly what not to do. The troubleshooting case study at the end of the chapter explains the method to troubleshoot that particular protocol and provides tips on what to basically look for. Then the troubleshooting exercises provide the opportunity to test the troubleshooting knowledge. This knowledge comes in handy for the CCIE LAB as time is always short and if something breaks down troubleshooting skills can make the difference between getting your magical Number or a visit to the LAB again. By totally revising and revamping the contents of the book the authors and reviewers have made sure that this book remains a must buy for all seasoned network engineers and students of Cisco Certifications. The author Jeff Doyle is a professional services engineer and IPv6 solutions manager. The coauthor Jennifer Carroll is an independent network consultant in Redmond, WA. I give this book 4 stars on a scale of 5, 5 being the highest. I strongly recommend this book. Niloufer Tamboly, CISSP

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  • Anonymous

    Posted December 17, 2008

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    Posted September 1, 2014

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