Which benefit is provided by FRR?

FRR provides fast *recovery* (rerouting) from failures, but not necessarily fast *detection* across all media, which is typically handled by other mechanisms like BFD.

FRR's primary benefit is fast rerouting of traffic around network failures, rather than rapid failure detection between forwarding engines.

FRR is a resiliency mechanism for traffic forwarding, not a tool for gathering performance data within a service provider network.

FRR (Fast Reroute) is an MPLS TE feature designed to provide local protection for LSPs against link or node failures along their primary path. It achieves this by pre-computing backup paths, allowing traffic to be quickly diverted around a failure point without waiting for global IGP or MPLS control plane reconvergence. This rapid rerouting minimizes packet loss and service disruption for critical MPLS TE LSPs.