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Segment Routing in MPLS Networks

You're reading from   Segment Routing in MPLS Networks Transition from traditional MPLS to SR-MPLS with TI-LFA FRR

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Product type Paperback
Published in Nov 2024
Publisher Packt
ISBN-13 9781836203216
Length 292 pages
Edition 1st Edition
Concepts
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Author (1):
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Hemant Sharma Hemant Sharma
Author Profile Icon Hemant Sharma
Hemant Sharma
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Table of Contents (20) Chapters Close

Preface 1. Part 1 - MPLS Overview and Recap
2. Chapter 1: Introduction to Multiprotocol Label Switching (MPLS) FREE CHAPTER 3. Chapter 2: Lab 1 – Getting Started with LDP-Based MPLS Network 4. Part 2 - Segment Routing (SR-MPLS)
5. Chapter 3: Lab 2 – Introducing Segment Routing MPLS (SR-MPLS) 6. Chapter 4: Lab 3 – SR-LDP Interworking 7. Part 3 - Fast Reroute in SR-MPLS Networks
8. Chapter 5: Lab 4 – Introducing TI-LFA (Topology Independent – Loop-Free Alternate) 9. Chapter 6: Lab 5 – Zero-Segment FRR 10. Chapter 7: Lab 6 – Single-Segment FRR 11. Chapter 8: Lab 7 – Double-Segment FRR 12. Chapter 9: Lab 8 – Microloop Avoidance 13. Chapter 10: Lab 9 – TI-LFA Node Protection 14. Chapter 11: Lab 10 – TI-LFA Local SRLG-Disjoint Protection 15. Chapter 12: Lab 11 – TI-LFA Global Weighted SRLG Protection 16. Chapter 13: Lab 12 – TI-LFA Node + SRLG Protection 17. Chapter 14: Lab 13 – TI-LFA Tiebreaker 18. Index 19. Other Books You May Enjoy

Lab 13 – TI-LFA Tiebreaker

In the previous chapter, the concept of TI-LFA node + SRLG protection was explored, demonstrating how a fast reroute backup path can be provided in networks where both node and SRLG failures are a concern. By combining these two protection mechanisms, comprehensive coverage is ensured, allowing traffic to be rerouted in various failure scenarios. This dual protection (link protection is enabled by default) is particularly valuable in large and complex production networks.

However, there are instances where TI-LFA can only offer either node protection or SRLG protection, but not both simultaneously. In such cases, the Point of Local Repair (PLR) router must prioritize one protection mechanism over the other. This is where the tiebreaker index values for each protection method, introduced in previous chapters, become crucial.

The decision to prioritize either node protection or SRLG protection is based on several factors. For example, if the underlying...

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