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IS-IS Network Design Solutions

Book Description

The definitive IS-IS reference and design guide

  • Extensive coverage of both underlying concepts and practical applications of the IS-IS protocol

  • Detailed explanation of how the IS-IS database works and relevant insights into the operation of the shortest path first (SPF) algorithm

  • Comprehensive tutorial on configuring and troubleshooting IS-IS on Cisco routers

  • Advanced information on IP network design and performance optimization strategies using IS-IS

  • Network design case studies provide a practical perspective of various design strategies

  • Comprehensive overview of routing and packet-switching mechanisms on modern routers

  • A collection of IS-IS packet formats and analyzer decodes useful for mastering the nuts and bolts of the IS-IS protocol and troubleshooting complex problems

  • Interior gateway protocols such as Intermediate System-to-Intermediate System (IS-IS) are used in conjunction with the Border Gateway Protocol (BGP) to provide robust, resilient performance and intelligent routing capabilities required in large-scale and complex internetworking environments. Despite the popularity of the IS-IS protocol, however, networking professionals have depended on router configuration manuals, protocol specifications, IETF RFCs, and drafts. Mastering IS-IS, regardless of its simplicity, has been a daunting task for many.

    IS-IS Network Design Solutions provides the first comprehensive coverage available on the IS-IS protocol. Networking professionals of all levels now have a single source for all the information needed to become true experts on the IS-IS protocol, particularly for IP routing applications. You will learn about the origins of the IS-IS protocol and the fundamental underlying concepts and then move to complex protocol mechanisms involving building, maintaining, and dissemination of the information found in the IS-IS database on a router. Subsequent discussions on IP network design issues include configuration and troubleshooting techniques, as well as case studies with practical design scenarios.

    Table of Contents

    1. Copyright
    2. About the Authors
    3. Acknowledgments
    4. Foreword
    5. Introduction
    6. IS-IS Protocol: Design Specification and Features
      1. Overview of IP Routing
        1. IP Routing and Forwarding
        2. Essentials of IP Addressing
        3. Classification of IP Routing Protocols
        4. Unicast Versus Multicast Routing
        5. Cisco Packet-Switching Mechanisms
        6. Comments on IPv6
        7. Summary
        8. Review Questions
        9. References
      2. Introduction to the IS-IS Routing Protocol
        1. ISO Connectionless Network Service
        2. Chapter Summary
        3. Review Questions
        4. References
      3. Integrated IS-IS Routing Protocol Concepts
        1. IS-IS Routing Domain
        2. IS-IS Areas and Routing Hierarchies
        3. IS-IS Packets
        4. IS-IS Protocol Functions
        5. Addressing Concepts in Integrated IS-IS
        6. Security
        7. Summary
        8. Review Questions
        9. References
      4. Addressing in Integrated IS-IS
        1. OSI Network Addresses
        2. NSAP Format
        3. Obtaining Globally Unique NSAP Addresses
        4. Defining the System ID
        5. Configuring Multiple NETs for a Single IS-IS Process
        6. NSAP Selector Values
        7. NSAP Address–to–Host Name Mapping
        8. Summary
        9. Review Questions
        10. References
      5. The IS-IS Link-State Database
        1. IS-IS Link-State Packets
        2. Link-State Packet TLVs
        3. IS-IS Metric Extensions
        4. Sequence Number Packets
        5. Flooding and Link-State Database Synchronization
        6. Protocol Timers and Other IS-IS Database Parameters
        7. More About the IS-IS Link-State Database
        8. Summary
        9. Review Questions
        10. References
      6. The Shortest Path First Algorithm
        1. Overview of the SPF Algorithm
        2. Calculating IS-IS Routes with the SPF Algorithm
        3. IS-IS SPF Operation on Cisco Routers
        4. Summary
        5. Review Questions
        6. References
    7. Integrated IS-IS Network Design for IP Internets
      1. General Network Design Issues
        1. IP Network Design Principles
        2. Using IS-IS as an IGP
        3. IS-IS Scaling Issues—Network Stability and Convergence
        4. Processing Resources
        5. Comparing Integrated IS-IS and OSPF
        6. A Brief Historical Tour
        7. Terminology
        8. IS-IS Versus OSPF—A Closer Look
        9. Summary
      2. Network Design Scenarios
        1. Case Study: Migration of Areas
        2. Case Study: Migration from Narrow to Wide Metrics
        3. Using IS-IS in ISP Networks
        4. Using IS-IS in Dual Environments
        5. Summary
        6. Review Questions
    8. Configuring and Troubleshooting Integrated IS-IS
      1. Configuring IS-IS for IP Routing on Cisco Routers
        1. Point-to-Point Serial-Link Configuration
        2. Configuring IS-IS on Broadcast Multiaccess Links
        3. Configuring IS-IS on NBMA Media
        4. Configuring IS-IS Capabilities
        5. Configuring IS-IS for Optimized Performance
        6. Summary
        7. References
      2. Troubleshooting the IS-IS Routing Protocol
        1. Interpreting the Output of Key IS-IS show Commands
        2. Other Useful IS-IS Troubleshooting Commands
        3. Troubleshooting IS-IS Routing Problems
        4. IS-IS Error Logging
        5. Summary
        6. Review Questions
        7. References
    9. Appendixes
      1. IS-IS Packet Formats
        1. IS-IS Packet Fields (Alphabetical Order)
        2. Hello Packets
        3. Link-State Packets
        4. Sequence Number Packets
      2. Answers to Review Questions
        1. Chapter 1
        2. Chapter 2
        3. Chapter 3
        4. Chapter 4
        5. Chapter 5
        6. Chapter 6
        7. Chapter 8
        8. Chapter 10
    10. Index