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352-001 · Question #435
352-001 Question #435: Real Exam Question with Answer & Explanation
The correct answer is A: down detection. MPLS Fast Reroute pre-computes backup paths, but the time to switch to those paths is gated entirely by how quickly a failure is detected - making down detection the critical mechanism for optimizing convergence speed.
Question
Which option is a critical mechanism to optimize convergence speed when using MPLS FRR?
Options
- Adown detection
- Bshared risk link groups
- Cbandwidth reservation
- DIGP timers
Explanation
MPLS Fast Reroute pre-computes backup paths, but the time to switch to those paths is gated entirely by how quickly a failure is detected - making down detection the critical mechanism for optimizing convergence speed.
Common mistakes.
- B. Shared Risk Link Groups (SRLGs) improve backup path diversity and reliability but do not directly accelerate the speed at which convergence occurs after a failure.
- C. Bandwidth reservation ensures capacity on backup paths but has no bearing on how quickly a failure is detected or the FRR switchover is triggered.
- D. IGP timer tuning affects overall topology reconvergence, but MPLS FRR is specifically designed to operate independently of IGP convergence - the bottleneck is detection speed, not IGP.
Concept tested. MPLS FRR failure detection and convergence optimization
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