Objective

The objective of this lab is to investigate a scenario where TI-LFA provides a backup path through two additional segments, encoded as labels in the backup path label stack.

This is accomplished by the following tasks:

• Increasing the metric on the P8–P4 link from 10 to 100, which breaks the overlap between the extended P-Space of the P2 router and the Q-Space of the PE5 router.
• Verifying whether a double-segment TI-LFA backup path is provided and installed in the RIB, FIB, and LFIB.

Figure 8.1 shows the state of the topology to explore whether TI-LFA can offer a backup path or not.

Figure 8.1 – Double-segment FRR

To achieve this state, the configuration from the next section needs to be applied accordingly.