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OSPF for the Initiated

Advanced topics for the CCIE Enterprise Infrastructure v1.1 Candidate

Angelos Vassiliou

All you ever needed to know about OSPF to help you pass the ENCOR exam and the CCIE Enterprise Infrastructure lab.

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About

About

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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Author

About the Author

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.

Contents

Table of Contents

Acknowledgments

  1. Introduction
  2. Acronyms

1.OSPF Basics

  1. 1.1Evolution
  2. 1.2Principles of operation
  3. 1.3The LSDB
  4. 1.4OSPF messages
  5. 1.5Basic configuration
  6. 1.6OSPF Finite State Machine
  7. 1.7References

2.LSA Types

  1. 2.1LSA structure
  2. 2.2LSDB synchronization
  3. 2.3Router LSA
  4. 2.4Network LSA
  5. 2.5Summary LSAs
  6. 2.6AS-external LSA
  7. 2.7NSSA-external LSA
  8. 2.8Opaque LSA (type 9, 10, 11 LSA)
  9. 2.9LSA flooding
  10. 2.10LSA MaxAge
  11. 2.11Multi-area design considerations

3.OSPF Network Types

  1. 3.1Point-to-Point
  2. 3.2Broadcast
  3. 3.3Point-to-multipoint
  4. 3.4Point-to-multipoint non-broadcast
  5. 3.5Non-broadcast multi-access (NBMA)
  6. 3.6Virtual links
  7. 3.7Loopback
  8. 3.8OSPF DR/BDR Election
  9. 3.9DR Preemption in DMVPN deployments (or the lack thereof)
  10. 3.10OSPF over DMVPN

4.OSPF Stub Areas

  1. 4.1Stub Areas
  2. 4.2Totally Stubby Areas
  3. 4.3Not-So-Stubby Areas
  4. 4.4NSSA Totally Stub Areas
  5. 4.5NSSA type-7 to type-5 Translator(s)

5.Path Selection

  1. 5.1Introduction
  2. 5.2OSPF RIB
  3. 5.3Cost
  4. 5.4Intra-area path selection
  5. 5.5Inter-area path selection
  6. 5.6Virtual links
  7. 5.7Transit areas
  8. 5.8Hot potato versus cold potato routing
  9. 5.9External destinations
  10. 5.10RFC 1583 Compatibility

6.Summarization in OSPF

  1. 6.1Internal Summarization
  2. 6.2Summarization of redistributed prefixes (external summarization)
  3. 6.3Summarization example 2
  4. 6.4Path selection with summarization
  5. 6.5Discard Routes

7.Filtering in OSPF

  1. 7.1Distribute Lists
  2. 7.2Administrative Distance
  3. 7.3Filtering during summarization
  4. 7.4Area filtering
  5. 7.5Filtering redistributed routes at the ASBR
  6. 7.6Filtering at the NSSA translator
  7. 7.7Scalability filtering
  8. 7.8LSDB Overload Protection
  9. 7.9Transit Network prefix suppression
  10. 7.10Database Filtering
  11. 7.11References

8.Default Routing in OSPF

  1. 8.1Default routing in stub areas
  2. 8.2Default routing in NSSAs
  3. 8.3Unconditional default routing
  4. 8.4Default routing
  5. 8.5Conditional default routing
  6. 8.6Reliable Conditional Default Routing

9.OSPF Security

  1. 9.1Overview of security mechanisms
  2. 9.2OSPFv2 Authentication
  3. 9.3OSPFv3 Security
  4. 9.4TTL Security

10.OSPF Optimizations

  1. 10.1Detection
  2. 10.2Propagation
  3. 10.3Process
  4. 10.4RIB/FIB
  5. 10.5Scalability in OSPF
  6. 10.6Other OSPF optimizations

11.Further topics

Contributors

About the Contributors

Veronica Bonacini

Laureen Hudson

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.

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