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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 protocols �from 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& 8217;s thorough explanations, end-of-chapter review questions, and many wide-ranging examples for both Cisco& 8217;s IOS and Juniper& 8217;s JUNOS also make this book an exceptional resource for anyone pursuing a CCIE or JNCIE certification. .

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