OSPF and IS-IS:Choosing an IGP for Large-Scale Networks
The practical guide to large-scale networking with OSPF and IS-IS
This is the definitive guide to using OSPF and IS-IS protocols in large-scale IP enterprise, carrier, and service provider networks. Well-known network designer Jeff Doyle draws on his consulting experience, offering realistic advice and straight answers on every aspect of working with link-state protocolsfrom scalability, reliability, and security to area design and database synchronization.
This book is organized to help network engineers and architects compare OSPF and IS-IS. One feature at a time, Doyle first demonstrates how a topic or feature is implemented in OSPF, and then walks through a similar implementation using IS-IS. Professionals who are relatively new to large-scale networking will welcome his practical introduction to the concepts, goals, and history of link state protocols. Coverage includes
Understanding message types, encapsulation, architecture, LSAs, and LSPs
Optimizing addressing, neighbor discovery, adjacencies, and router designation
Improving scalability: controlling the scope of flooding, link state database size, SPF calculation efficiency, and much more
Designing and operating large-scale networks for maximum security and reliability
Hardening networks to thwart attacks against routing protocols
Comparing OSPF and IS-IS extensibility
Utilizing extensions for MPLS-based traffic engineering, IPv6, and multi-topology routing
Troubleshooting OSPF and IS-IS log entries, debug output, and LS databases
Doyle’s thorough explanations, end-of-chapter review questions, and many wide-ranging examples for both Cisco’s IOS and Juniper’s JUNOS also make this book an exceptional resource for anyone pursuing a CCIE or JNCIE certification.
The practical guide to large-scale networking with OSPF and IS-IS
This is the definitive guide to using OSPF and IS-IS protocols in large-scale IP enterprise, carrier, and service provider networks. Well-known network designer Jeff Doyle draws on his consulting experience, offering realistic advice and straight answers on every aspect of working with link-state protocolsfrom scalability, reliability, and security to area design and database synchronization.
This book is organized to help network engineers and architects compare OSPF and IS-IS. One feature at a time, Doyle first demonstrates how a topic or feature is implemented in OSPF, and then walks through a similar implementation using IS-IS. Professionals who are relatively new to large-scale networking will welcome his practical introduction to the concepts, goals, and history of link state protocols. Coverage includes
Understanding message types, encapsulation, architecture, LSAs, and LSPs
Optimizing addressing, neighbor discovery, adjacencies, and router designation
Improving scalability: controlling the scope of flooding, link state database size, SPF calculation efficiency, and much more
Designing and operating large-scale networks for maximum security and reliability
Hardening networks to thwart attacks against routing protocols
Comparing OSPF and IS-IS extensibility
Utilizing extensions for MPLS-based traffic engineering, IPv6, and multi-topology routing
Troubleshooting OSPF and IS-IS log entries, debug output, and LS databases
Doyle’s thorough explanations, end-of-chapter review questions, and many wide-ranging examples for both Cisco’s IOS and Juniper’s JUNOS also make this book an exceptional resource for anyone pursuing a CCIE or JNCIE certification.
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About the Author
Specializing in IP routing protocols, MPLS, and IPv6, Jeff Doyle has designed or assisted in the design of large-scale IP service provider networks throughout North America, Europe, Japan, Korea, and the People’s Republic of China. Jeff is the author of CCIE Professional Development: Routing TCP/IP, Volumes I and II, and is an editor and contributing author of Juniper Networks Routers: The Complete Reference. Jeff has presented numerous corporate seminars for Juniper Networks, and has also spoken at NANOG, JANOG, APRICOT, and at IPv6 Forum conferences.
Prior to joining Juniper Networks, Jeff was a Senior Network Systems Consultant with International Network Services, where he also specialized in IP routing protocol design. Jeff holds a Bachelor of Arts degree from Memphis State University, and studied electrical engineering at the University of New Mexico. Jeff lives in Denver, Colorado, with his wife and four children.
Copyright
About the Author
Preface
Audience
What Is a Large-Scale Data Communications Network?
A Word on IOS and JUNOS
Acknowledgments
Chapter 1. The Roots of Link State Protocols
Section 1.1. An Intergalactic Network
Section 1.2. ARPANET
Section 1.3. The Network Working Group
Section 1.4. The Birth of the Internet
Section 1.5. Routing in the ARPANET
Section 1.6. The European Invasion
Section 1.7. Separate But Equal
Section 1.8. Conclusion
Chapter 2. Link State Basics
Section 2.1. Vector Protocol Basics
Section 2.2. Fundamental Link State Concepts
Review Questions
Chapter 3. Message Types
Section 3.1. Comparative Terminology
Section 3.2. Message Encapsulation
Section 3.3. Message Architecture
Section 3.4. Message Types
Chapter 4. Addressing, Neighbor Discovery, and Adjacencies
Section 4.1. Router and Area IDs
Section 4.2. The Hello Protocol
Section 4.3. Adjacencies
Section 4.4. Designated Routers
Section 4.5. Media Types
Section 4.6. Interface Databases
Review Questions
Chapter 5. Flooding
Section 5.1. Flooding Components
Section 5.2. Areas and Router Types
Section 5.3. Metric Types
Section 5.4. Essential LSAs
Section 5.5. Essential TLVs
Review Questions
Chapter 6. Link State Database Synchronization
Section 6.1. OSPF Database Synchronization
Section 6.2. IS-IS Database Synchronization
Review Questions
Chapter 7. Area Design
Section 7.1. Area Scalability
Section 7.2. Area Reliability
Section 7.3. OSPF Areas
Section 7.4. IS-IS Areas
Section 7.5. BGP and Area Design
Review Questions
Chapter 8. Scaling
Section 8.1. SPF Enhancements
Section 8.2. Flooding Enhancements
Section 8.3. Fragmentation
Section 8.4. Overloading
Review Questions
Chapter 9. Security and Reliability
Section 9.1. Routing Protocol Vulnerabilities
Section 9.2. Security and Reliability Features
Section 9.3. Designing for Security and Reliability
Section 9.4. Operating for Security and Reliability
Review Questions
Chapter 10. Extensibility
Section 10.1. Extending OSPF
Section 10.2. Extending IS-IS
Section 10.3. Route Tagging
Review Questions
Chapter 11. Extensions for MPLS Traffic Engineering
Section 11.1. MPLS: An Overview
Section 11.2. Traffic Engineering: An Overview
Section 11.3. OSPF Extensions for Traffic Engineering
Section 11.4. IS-IS Extensions for Traffic Engineering
Review Questions
Chapter 12. Extensions for IPv6
Section 12.1. IPv6: An Overview
Section 12.2. OSPFv3
Section 12.3. IS-IS Extensions for IPv6
Review Questions
Chapter 13. Extensions for Multi-Topology Routing
Section 13.1. OSPF Extensions for Multi-Topology Routing
Section 13.2. IS-IS Extensions for Multi-Topology Routing
Review Questions
Afterword: The Future of Link State Protocols
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