OSPF for the Initiated
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OSPF for the Initiated

Advanced topics for the CCIE Enterprise Infrastructure v1.1 Candidate

About the Book

OSPF for the Initiated is a book for the CCIE Enterprise Infrastructure candidate. It will thoroughly prepare you for the toughest questions and tasks on OSPF, and will help you understand OSPF at a new level.

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    • Networking
    • Computer Science
    • Computers and Programming
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About the Author

Angelos Vassiliou
Angelos Vassiliou

Angelos Vassiliou is an Electronics Engineer with the Cyprus National Guard and holds the CCNP R&S certification. He also holds a Masters of Engineering in Computer Engineering from the University of Cyprus. Angelos lives in Cyprus with his wife, Christiana, and two children, Anna and Alexander.

About the Contributors

Nicholas Russo
Nicholas Russo

Nicholas (Nick) Russo, CCDE™ #20160041 and CCIE™ #42518, holds active CCIE certifications in both Routing and Switching and Service Provider. Nick was among the first individuals to pass the CCIE Service Provider version 4 lab examination and this book represents his personal journey towards that end. Nick also holds a Bachelor’s of Science in Computer Science, and a minor in International Relations, from the Rochester Institute of Technology (RIT). Nick lives in Maryland, USA with his wife, Carla, and daughter, Olivia.

Laureen Hudson
Laureen Hudson

Developmental Editor

Veronica Bonacini
Veronica Bonacini

Artist | Digital Art

Table of Contents

    • Acknowledgments
    • Introduction
    • Acronyms
  • 1. OSPF Basics
    • 1.1 Evolution
    • 1.2 Principles of operation
    • 1.3 The LSDB
    • 1.4 OSPF messages
    • 1.5 Basic configuration
    • 1.6 OSPF Finite State Machine
    • 1.7 References
  • 2. LSA Types
    • 2.1 LSA structure
    • 2.2 LSDB synchronization
    • 2.3 Router LSA
    • 2.4 Network LSA
    • 2.5 Summary LSAs
    • 2.6 AS-external LSA
    • 2.7 NSSA-external LSA
    • 2.8 Opaque LSA (type 9, 10, 11 LSA)
    • 2.9 LSA flooding
    • 2.10 LSA MaxAge
    • 2.11 Multi-area design considerations
  • 3. OSPF Network Types
    • 3.1 Point-to-Point
    • 3.2 Broadcast
    • 3.3 Point-to-multipoint
    • 3.4 Point-to-multipoint non-broadcast
    • 3.5 Non-broadcast multi-access (NBMA)
    • 3.6 Virtual links
    • 3.7 Loopback
    • 3.8 OSPF DR/BDR Election
    • 3.9 DR Preemption in DMVPN deployments (or the lack thereof)
    • 3.10 OSPF over DMVPN
  • 4. OSPF Stub Areas
    • 4.1 Stub Areas
    • 4.2 Totally Stubby Areas
    • 4.3 Not-So-Stubby Areas
    • 4.4 NSSA Totally Stub Areas
    • 4.5 NSSA type-7 to type-5 Translator(s)
  • 5. Path Selection
    • 5.1 Introduction
    • 5.2 OSPF RIB
    • 5.3 Cost
    • 5.4 Intra-area path selection
    • 5.5 Inter-area path selection
    • 5.6 Virtual links
    • 5.7 Transit areas
    • 5.8 Hot potato versus cold potato routing
    • 5.9 External destinations
    • 5.10 RFC 1583 Compatibility
  • 6. Summarization in OSPF
    • 6.1 Internal Summarization
    • 6.2 Summarization of redistributed prefixes (external summarization)
    • 6.3 Summarization example 2
    • 6.4 Path selection with summarization
    • 6.5 Discard Routes
  • 7. Filtering in OSPF
    • 7.1 Distribute Lists
    • 7.2 Administrative Distance
    • 7.3 Filtering during summarization
    • 7.4 Area filtering
    • 7.5 Filtering redistributed routes at the ASBR
    • 7.6 Filtering at the NSSA translator
    • 7.7 Scalability filtering
    • 7.8 LSDB Overload Protection
    • 7.9 Transit Network prefix suppression
    • 7.10 Database Filtering
    • 7.11 References
  • 8. Default Routing in OSPF
    • 8.1 Default routing in stub areas
    • 8.2 Default routing in NSSAs
    • 8.3 Unconditional default routing
    • 8.4 Default routing
    • 8.5 Conditional default routing
    • 8.6 Reliable Conditional Default Routing
  • 9. OSPF Security
    • 9.1 Overview of security mechanisms
    • 9.2 OSPFv2 Authentication
    • 9.3 OSPFv3 Security
    • 9.4 TTL Security
  • 10. OSPF Optimizations
    • 10.1 Detection
    • 10.2 Propagation
    • 10.3 Process
    • 10.4 RIB/FIB
    • 10.5 Scalability in OSPF
    • 10.6 Other OSPF optimizations
  • 11. Further topics

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