350-501 Question #317: Real Exam Question with Answer & Explanation

Question

Which benefit is provided by FRR?

Options

• AIt provides fast forwarding path failure detection times for all media.
• BIt provides rapid failure detection between forwarding engines.
• CIt provides performance data for the service provider network.
• DIt protects Cisco MPLS TE LSPs from link and node failures.

Explanation

Fast Reroute (FRR) provides a critical benefit by protecting MPLS Traffic Engineering (TE) Label Switched Paths (LSPs) from link and node failures, ensuring rapid recovery.

Common mistakes.

• A. FRR provides fast recovery (rerouting) from failures, but not necessarily fast detection across all media, which is typically handled by other mechanisms like BFD.
• B. FRR's primary benefit is fast rerouting of traffic around network failures, rather than rapid failure detection between forwarding engines.
• C. FRR is a resiliency mechanism for traffic forwarding, not a tool for gathering performance data within a service provider network.

Concept tested. MPLS TE Fast Reroute (FRR)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_prot/configuration/xe-3s/mp-te-path-prot-xe-3s-book/mp-te-frr.html

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