Objective

This lab continues from the previous chapter. The objective is to explore a scenario where TI-LFA Global Weighted SRLG protection provides a backup path that avoids both local and remote SRLGs in a network, enabling fast rerouting of traffic from the PLR to the destination. This is achieved through the following outlined tasks:

1. Apply the configuration to make the P7–P3 link part of the same SRLG as in the previous lab
2. Advertise the SRLG information to all the routers in the network through the IS-IS LSPDU
3. Request Global Weighted SRLG protection on P2, against the P2–P3 link failure
4. Verify that the backup path is computed and added to the RIB, FIB, and LFIB of P2, as requested in this lab.

Let’s begin with the required configuration.