Summary

In this chapter, the focus was on zero-segment FRR, a scenario where MPLS backup paths are established without requiring any additional segment or label in the label stack. The primary objective was to ensure that if there is a link or node failure, a swift and efficient rerouting mechanism is in place to maintain network connectivity.

To achieve this, the topology was modified to create a non-ECMP path from P2 to PE5. This ensured that there was a distinct path available for fast rerouting purposes. The lab then proceeded to verify that the zero-segment backup path was correctly computed and added to the Routing Information Base (RIB), Forwarding Information Base (FIB), and Label Forwarding Information Base (LFIB).

The emphasis was placed on understanding the backup path calculation process and the rationale behind choosing one method over another.

Once the lab objectives were achieved and the functionality of the backup path was verified, the network topology was...