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

Product type Paperback

Published in Nov 2024

Publisher Packt

ISBN-13 9781836203216

Length 292 pages

Edition 1st Edition

Concepts

Networking

Author (1):

Hemant Sharma

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Table of Contents (20) Chapters

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

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Verification

If the link between P2 and P3 goes down or router P3 becomes unavailable due to a node failure, the only remaining path for P2 to reach PE5 is through the next hop, P6. This path represents the TI-LFA post-convergence route in the next section.

Verify single-segment backup path

The following RIB output indicates that the backup path now uses TI-LFA (link), signifying the default link protection method, along with an additional label, 16008. This label corresponds to the Node-SID of P8.

Backup path in RIB

The backup path is on the post-convergence path if the P2-P3 link fails, as shown here:

RP/0/RP0/CPU0:P2#show isis fast-reroute detail 5.5.5.5/32
L2 5.5.5.5/32 [30/115] Label: 16005, medium priority
   Installed Jan 01 07:14:44.417 for 00:00:13
     via 23.0.0.3, GigabitEthernet0/0/0/0, Label: 16005, P3, SRGB Base: 16000, Weight: 0
       Backup path: TI-LFA (link), via 26.0.0.6,...