PDF Ebook OSPF: Anatomy of an Internet Routing Protocol, by John T. Moy
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OSPF: Anatomy of an Internet Routing Protocol, by John T. Moy
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This work examines the topic of routing, and provides detailed coverage of the routing protocol, OSPF (Open Shortest Path First) which was developed by the author. Part One defines Internet routing in general and discusses a variety of protocols in addition to OSPF. Part Two then delves into the details of the OSPF protocol, explaining why it was developed and how it improves network efficiency. Exercises are provided.
- Sales Rank: #718127 in Books
- Color: Blue
- Published on: 1998-02-12
- Original language: English
- Number of items: 1
- Dimensions: 9.40" h x .80" w x 7.40" l, 1.37 pounds
- Binding: Paperback
- 339 pages
From the Inside Flap
Introduction The Internet is a global communications network. With connections in more than 100 countries, tens of millions of people use the Internet for business, education, and recreation. Electronic commerce is beginning on the Internet as businesses connect to sell their products and services. Academics collaborate over the Internet by exchanging electronic mail. People can converse using Internet phones, send faxes, participate in online chats and bulletin boards, play multiuser games, and experiment with virtual environments. Special-purpose computers called routers connect the Internet together. As data is forwarded from one place in the Internet to another, it is the routers that make the decisions as to where and how the data is forwarded. The protocols that dynamically inform the routers of the paths that the data should take are called routing protocols. It is the job of these protocols to react quickly to changes in the Internet's infrastructure, such as transmission lines going in and out of service, routers crashing, changes in network policies, and so on. Routing is what makes the Internet tick. Although many users of the Internet and the World Wide Web are unaware of the machinery underlying the network applications, routing is an interesting but complicated subject. Routing protocols are sophisticated distributed algorithms that must also be extremely robust to keep a large, decentralized network like the Internet running smoothly. Audience This book is for students of data communications, TCP/IP network administrators, protocol designers, developers of routing protocol software, and other professionals involved in the design, development, and management of TCP/IP networks. This book is a practical, hands-on description of Internet routing rather than a theoretical treatment. Although we describe how the various protocols were intended to work, we also describe how well the design has translated into practice. Internet protocol design is a practical undertaking itself, with efficiency of implementation often dictating design choices. For this reason, this book gives an in-depth treatment of how a router really works. Instead of just describing the algorithms, this book goes beyond to show how the algorithms are implemented. We often present ideas in a historical context, showing how Internet protocols have evolved. This is done for two reasons. First, you can learn a lot from the mistakes (and successes) of the past. Second, in order to participate in Internet discussion groups, many of which are dominated by old-timers, it is good to have some context. This book is not an elementary introduction to TCP/IP and its routing. Instead we assume that you have some familiarity with the TCP/IP protocol suite and some exposure to the basic concepts of routing. These assumptions allow us to explore many of the facets of Internet routing in greater detail than possible in an introductory text. Organization of This Book
This book is organized into five parts. Part I sets the groundwork for a discussion of Internet routing. After a brief description of how routing fits together with the rest of the Internet's protocols, Chapter 1 describes in depth how a router forwards packets. This discussion naturally leads to an explanation of IP addressing and CIDR, as well as of the interaction of hosts and routers. Internet routing protocols are introduced in Chapter 2, beginning with a treatment of the end product of all routing protocols: the router's routing table. Chapter 2 ends with an overview of the Internet's routing architecture and the two main routing technologies in use in today's Internet: Distance Vector and link-state algorithms.
Part II describes the Internet's OSPF routing protocol. We start in Chapter 3 with an explanation of why the OSPF protocol was developed in the first place. Chapter 4 discusses the basics of link-state routing; Chapter 5, how OSPF behaves over various subnet technologies; Chapter 6, its use of hierarchical routing; and Chapter 7, extensions to OSPF. Each chapter not only describes how OSPF works but also explains why it works that way. We explore the reasons behind OSPF's design decisions and how the OSPF protocol has evolved to keep pace with the rapidly changing Internet environment. Part II concludes with an OSPF FAQ (Chapter 8).
Part III (Chapters 9 and 10) describes TCP/IP multicast routing, including broadcast and multicast forwarding, the MBONE, and the two distinct types of multicast routing protocols: source-based trees and shared-tree algorithms. As we did with unicast routing, we go further into the subject of multicast routing through the examination of a particular multicast routing protocol: the Multicast Extensions to OSPF (MOSPF).
Part IV covers the configuration and management of Internet routing. The configuration and management of OSPF is explained in detail in Chapter 11. Chapter 12 describes the tools used to monitor and debug routing in a TCP/IP network. For each tool, we describe its use, how it works, and its advantages and drawbacks.
Part V is a comparison of Internet routing protocols. Chapter 13 compares and contrasts the routing protocols in use in the Internet: RIP, OSPF, BGP, IGRP, and IS-IS. In Chapter 14, we examine the available multicast protocols: DVMRP, MOSPF, PIM Dense and Sparse, and CBT.
Following Chapter 14 is an extensive bibliography arranged and numbered in alphabetical order. Within the text, the citation 85, for example, refers to item 85 in the bibliography. Companion Book: OSPF Complete Implementation
The companion book OSPF Complete Implementation, in keeping with the Internet tradition that reveres "working code" over all else, explores even further the mechanics of Internet routing through examination of a real, working OSPF implementation. The book contains a complete implementation of OSPF on CD. Written in C++, the OSPF implementation is intended to be portable to a wide range of environments. Two sample ports are included: an OSPF routing daemon (called ospfd) for FreeBSD 2.1 and an OSPF routing simulator that can be run on Windows 95. The OSPF implementation has been developed using publicly available tools. Acknowledgments
I would like to thank the technical reviewers who improved this book through their thoughtful and timely reviews: Ran Atkinson, Eural Authement, Fred Baker, Howard Berkowitz, Jeffrey Burgan, Joel Halpern, Mukesh Kacker, Robert Minnear, Jim Reid, and W. Richard Stevens. Thanks also to Tim Stoddard and the Arkansas Public School Computer Network (APSCN) for letting me collect OSPF statistics on the APSCN network and use that network as an example of OSPF configuration in Chapter 11, Configuration and Management. Thanks to S. Randall McLamb for drawing the figures.
I would also like to acknowledge the help of my editors at Addison Wesley Longman over the long life of this project: Carol Long, Karen Gettman, and Mary Harrington.
And special thanks to my wife, Sonya Keene, who designed the book, edited rough drafts, created the index, and gave encouragement while this book was being written. J.M.
October, 1997 0201634724P04062001
From the Back Cover
Written for TCP/IP network administrators, protocol designers, and network application developers, this book gives the most complete and practical view ever into the inner workings of Internet routing. The book focuses on OSPF (Open Shortest Path First), a common TCP/IP routing protocol that provides robust and efficient routing support in the most demanding Internet environments. A methodical and detailed description of the protocol is offered and OSPF's role within the wider context of a TCP/IP network is demonstrated.
Practical throughout, the book provides not only a theoretical description of Internet routing, but also a real-world look into how theory translates into practice. It shows how algorithms are implemented, and how the routing protocols function in a working network where transmission lines and routers routinely break down.
You will find clear explanations of such routing fundamentals as how a router forwards packets, IP addressing, CIDR (Classless Inter-Domain Routing), the routing table, Internet routing architecture, and the two main routing technologies: Distance Vector and link-state algorithms. OSPF is discussed in depth, with an examination of the rationale behind OSPF's design decisions and how it has evolved to keep pace with the rapidly changing Internet environment. OSPF topics covered by the book include the following:
- OSPF areas and virtual links
- NBMA (Nonbroadcast multi-access) and Point-to-MultiPoint network segments
- OSPF configuration and management
- Interaction with other routing protocols
- OSPF cryptographic authentication
- OSPF protocol extensions, including the Demand Circuit extensions and the multicast extensions to OSPF (MOSPF)
- An OSPF FAQ
IP multicast and multicast routing are also discussed. Methods for debugging routing problems are explained, including a catalog of available debugging tools. The book also offers side-by-side comparisons of all the unicast and multicast routing protocols currently in use in the Internet.
You will come away from this book with a sophisticated understanding of Internet routing and of the OSPF protocol in particular. Moreover, the book's practical focus will enable you to put this deeper understanding to work in your network environment.
0201634724B04062001
About the Author
John T. Moy is a Senior Consulting Engineer at Ascend Communications. He is the author of the OSPF and MOSPF protocol specifications and currently chairs the OSPF and MOSPF Working Groups in the Internet Engineering Task Force. Mr. Moy has been involved in the design and development of router software for 15 years, currently at Ascend, and previously at Proteon and at Bolt Beranek and Newman. Mr. Moy holds a Master of Arts in Mathematics from Princeton University and a Bachelor of Engineering in Mathematics from the University of Minnesota.
0201634724AB04062001
Most helpful customer reviews
7 of 7 people found the following review helpful.
Standards-based explanation of OSPF
By Keith Tokash
I'm biased against proprietary protocols, so understand where I come from when I say that I wouldn't run any other IGP than OSPF. ISIS has a few strange things but thats not the point here.
This book gives the networking world a great explanation of how OSPF is designed to work as a standard, not how Cisco implements it (which, by the way, I think they do very well). Not only does Moy explain how OSPF works, but he tells us WHY he decided it should work that way. He also gives a brief history of the early OSPF vs ISIS conflict and OSPF's development process, including what was wrong with OSPF ver1. This book helps spare you from scouring the 1000 or so RFC pages that describe OSPF.
This book is a little pricey, and probably isn't necessary to get OSPF running (read Doyle), but it will deepen your understanding of the protocol and is written in clear, old-fashioned English.
One last thing. Read Jeff Doyle or some other good material on OSPF first, this book will offer you much more if you already understand the protocol to a certain degree.
6 of 6 people found the following review helpful.
Solid treatment of the subject
By A Customer
I wasn't thinking of reviewing this book till I saw the undeservedly negative comment. The book provides excellent information on OSPF and is a very useful companion to the OSPF/MOSPF RFCs (also written by John Moy). Having worked with routing for a few years now and having been through the excellently written OSPF RFCs a couple of times, I found parts II and III of the book to be a very good refresher on OSPF. On finishing the book I found my approach to solving OSPF problems a lot more purposeful and cleaner than before. The book definitely has a bias towards people already familiar with some of the core routing and OSPF/link-state concepts, but this shouldn't discorage the novice who should find this book an invaluable reference as he/she learns more about the subject.
3 of 3 people found the following review helpful.
The bible for OSPF
By rpv
Moy's book is the only volume dedicated solely to explaining open shortest path first (OSPF) protocol that exists in the market. People may very well prefer this book to the plain text 244-page Internet Engineering Task Force's Request for Comments (IETF RFC). As author of OSPF versions 1 and 2, Moy was the most qualified person to write this much-needed book. OSPF is a complex routing protocol, and books that partially deal with the subject often do not do so thoroughly enough. The audience for this book is anyone interested in learning about the protocol, such as network engineers, designers, researchers, and network operations staff.
The book starts with an overview of Internet routing protocols and routing technologies. Readers who are familiar with the topic can safely ignore this section. The core of the book is contained in chapters 3 through 7, which describe the OSPF protocol. Chapter 3 is an interesting read because it highlights how OSPF evolved into its current stage from its historical beginnings. The requirements of the routing protocol, how the decisions were made in IETF, version 1, field trials, and the success and problems encountered are described in this chapter. The problems faced in the early days of OSPF ultimately led to the now stable version 2 of the protocol. Chapter 4 establishes the foundations of OSPF, with an example network topology and various packet formats used by OSPF packet types. Chapter 5 delves into various types of networks including broadcast and non-broadcast multi access (NBMA), and leads to multipoint and how OSPF works in these networks. Concept of areas and hierarchical networks are explained in the next chapter. Various extensions of OSPF have sprung up, and they are explained in chapter 7. Though the core chapters describe the OSPF protocol, for the serious developer or a person who wants to troubleshoot a network through a sniffer, the OSPF version 2 RFC 2328 is still a must-read. The book provides a very conceptual and logical understanding of the OSPF, and lays the foundation for reading the RFC. Both are complementary, and one does not substitute for the other.
A chapter in the form of frequently asked questions (FAQ) is included, which is a welcome change (rather than addressing these in specific sections of each chapter). The book also covers multicast OSPF in great detail, and deals with configuration and management, frequently ignored subject matter in many protocol books, but a very crucial element in the big picture. The book has a section on the OSPF management information base (MIB), and provides an overview of all the tables contained in the MIB. Small sample configurations are also included. Moy devotes a section to debugging the implementations and provides various clues to the reader who may be troubleshooting OSPF in a production or test network. This will be really useful to the network operations staff at network operations centers (NOCs) that will be troubleshooting live OSPF networks. Even though OSPF implementations could be relatively bug-free, operator errors could really cripple the networks, so good troubleshooting/debugging skills are very important. The book ends with a comparison of various unicast and multicast routing protocols, and includes an extensive bibliography of routing protocol literature.
Although I would have liked more details to be included in the core OSPF chapters, the explanation is sufficient to spark a reader's interest in pursing the topic further. Moy has also written a companion book (sort of a second volume), describing his own implementation of OSPF. It describes a C++ implementation, and is useful for developers and engineers interested in implementing OSPF, which is the subject of the author's a Web site [...]
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