Summary

The chapter began with an introduction to MPLS TE within the network topology. This introduction is intended to facilitate the creation of auto-tunnels, which will be discussed later in the book. Introducing MPLS TE at this point provides a foundation before delving further into the TI-LFA lab scenarios.

In scenarios where the TI-LFA backup path could not be identified with two additional segments encoded as labels – given that the maximum label depth is three for the Cisco IOS XR platform – MPLS TE initiates an auto-tunnel instead.

The topology was then modified to explore node protection and SRLG protection scenarios for ease of understanding.

Node protection is enabled by configuring a non-zero fast-reroute tiebreaker index value on P2. The significance of this index will be discussed later in the book.

The TI-LFA backup path outputs from the RIB, FIB, and LFIB confirmed that the desired node protection backup path was available. Additionally, the...