IS-IS, the Intermediate System to Intermediate System protocol, has been used effectively as a routing protocol for many large-scale networks, including service provider backbone, telephone system management, and power equipment networks. Used in conjunction with the Border Gateway Protocol (BGP), IS-IS offers Internet Service Providers and the administrators of other large networks advanced flexibility and scalability. As a result, the number of complex networks employing the IS-IS protocol has grown tremendously.
IS-IS: Deployment in IP Networks is a hands-on guide for network engineers deploying, maintaining, and building IS-IS networks. Based on both the best practices of current implementations and the specifications of the protocol, IS-IS provides highly valuable configuration examples using Cisco IOS Software combined with real-life, expert descriptions, analysis, and advice. Readers will also find case studies and operational theory about this powerful and popular routing protocol.
Examining the IS-IS protocol from its origins to the most recent innovations, this book covers all of the protocol's pieces, packets, deployment strategies, and issues. It is a valuable resource for networking students preparing for the CCIE® (Cisco Certified Internetwork Expert) exam.
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Sample Chapter 4
(NOTE: Each chapter concludes with Review Questions.)
1. IS-IS Fundamentals.
A Historical Perspective of IS-IS.
Link State Protocol Concepts.
IS-IS Packet Format Essentials.
IS-IS Packet Encapsulation.
Neighbor Relationships and Pseudonodes on Broadcast Networks.
Flooding Mechanisms and Timers.
What Are Domains and Why Are They Used?
Properties of Domains.
Routing from Level 1 Domains into the Level 2 Domain.
Level 2 Domain Partitions.
Level 1 Domain Partitions.
Level 1 Domains and Suboptimal Routing.
Level 1 Domains and Next Hop Reachability.
Domains and Hierarchical Network Design.
Other Design and Deployment Issues.
A Case Study in Deploying IS-IS.
MPLS Additions to IS-IS.
Traffic Engineering and Constrained SPF.
Back Door Links.
IS-IS Interaction with IP Over Redundant Packet Rings (IPoRPR).
IS-IS and Nonstop Forwarding.
More than 256 LSP Fragments.
From the first inception of networked systems, networks have grown into large international systems that impact our daily lives in ways we can hardly begin to imagine. Just about every piece of information about any good or service, any financial transaction, and many other forms of communication, all pass through a network of some type. Each of these networks generally relies on one of four routing protocols to direct and guide these packets of information flowing from place to place: Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol (EIGRP), the Border Gateway Protocol (BGP), and/or Intermediate System to Intermediate System (IS-IS).
The goal of this book is to examine and describe the last of these protocols, IS-IS, a widely used protocol that hasn't been examined in the detail that other routing protocols have, in the context of routing for the Internet Protocol (TCP/IP) protocol suite. While IS-IS was originally designed to (and still does) provide routing information for the OSI suite of network protocols, most of the devices in use today use the IP protocols to communicate.
If you are running IS-IS, are planning on running it, or are just a network engineer hoping to gain further understanding on the various concepts of routing and routing protocols, this book will help you. If you are protocol developer, this book will give you a sense of the IS-IS protocol, and how it is used.
We begin, in Chapter 1, with an overview of the IS-IS protocol, including a short history, Dijkstra's Shortest Path First algorithm, and other fundamentals of the IS-IS routing system. The second chapter delves into protocol details, including packet formats and protocol mechanisms. Chapter 3 discusses designing an IS-IS routing domain, while Chapter 4 discusses other issues you may face when deploying a large-scale IS-IS network. Chapter 5 provides a very short look at the interaction between IS-IS and Multiprotocol Label Switching (MPLS). Each chapter includes review questions that may be suitable for use in a classroom environment; answers to the questions are provided in an appendix at the end of the book.
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