TI-LFA node protection preference

The TI-LFA node protection preference scenario is depicted in Figure 14.4.

Figure 14.4 – TI-LFA tiebreaker node protection preference

As seen here, the topology is strategically designed to not offer all three TI-LFA path protections (link + node + SRLG) simultaneously.

Objective

The objective of this lab is to explore a scenario where the router requests TI-LFA to provide link (default) + node + SRLG protection. However, due to the absence of simultaneous protection and the nature of the topology, TI-LFA prefers node protection. This objective is achieved through the tasks outlined here:

1. Prefer node protection over SRLG protection on P2 by increasing the SRLG index.
2. Verify that TI-LFA backup path protection prioritizes node protection.

Let’s dive in.

Configuration

The lower the tiebreaker index, the higher the protection preference.

Raise the SRLG protection tiebreaker index...