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350-501 · Question #433
350-501 Question #433: Real Exam Question with Answer & Explanation
The correct answer is D: PLR prefers FRR NNHOP backup tunnels over NHOP tunnels. When deploying RSVP-TE FRR, a key consideration is that the Point of Local Repair (PLR) prioritizes Next-Next-Hop (NNHOP) backup tunnels over Next-Hop (NHOP) tunnels due to the broader protection NNHOP offers.
MPLS and Segment Routing
Question
Which fact must a network engineer consider when planning to deploy RSVP-TE FRR?
Options
- APLR prefers FRR NHOP backup tunnels over NNHOP tunnels
- BFRR protects MPLS LDP and RSVP-TE LSPs
- CThe FRR backup tunnel reserves the total bandwidth of all protected tunnels
- DPLR prefers FRR NNHOP backup tunnels over NHOP tunnels
Explanation
When deploying RSVP-TE FRR, a key consideration is that the Point of Local Repair (PLR) prioritizes Next-Next-Hop (NNHOP) backup tunnels over Next-Hop (NHOP) tunnels due to the broader protection NNHOP offers.
Common mistakes.
- A. This is the opposite of the correct behavior; NNHOP offers more comprehensive protection against both link and node failures.
- B. RSVP-TE Fast Reroute is a feature specifically designed for RSVP-TE Label Switched Paths and does not provide FRR protection for MPLS LDP LSPs, which rely on IGP convergence for rerouting.
- C. FRR backup tunnels reserve bandwidth sufficient to carry the traffic of the specific primary tunnel they are designed to protect, not the aggregate bandwidth of all potentially protected tunnels simultaneously.
Concept tested. RSVP-TE Fast Reroute (FRR) protection
Topics
#RSVP-TE#MPLS TE FRR#Node Protection#Link Protection
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