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Question 1,286 of 1,840
mediumDrag & DropObjective-mapped
350-401 Practice Question: Drag and drop the steps of MPLS FRR (Fast…
Drag and drop the steps of MPLS FRR (Fast Reroute) backup tunnel activation into the correct order, from first to last.
Answer choices
Why each option matters
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Correct answer & explanation
✓
Pre-configure backup tunnel protecting primary LSP
MPLS FRR begins with pre-configuring backup tunnel, protecting the primary LSP, detecting link/node failure via BFD or interface down, switching traffic to backup tunnel, and then signaling a new LSP for restoration.
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Same concept, more angles
1 more way this is tested on 350-401
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Variation 1. Drag and drop the steps of MPLS FRR (Fast Reroute) backup tunnel activation into the correct order, from first to last.
medium- ✓ A.Configure backup tunnel on PLR
- ✓ B.Merge backup tunnel with protected LSP
- ✓ C.Detect link or node failure
- ✓ D.PLR switches traffic to backup tunnel
- ✓ E.Revert traffic to primary LSP after repair
Why A: MPLS FRR begins with configuring the backup tunnel on the PLR. The PLR then merges the backup tunnel with the protected LSP. When a link or node failure is detected, the PLR immediately switches traffic to the backup tunnel. After the failure is repaired, traffic reverts to the primary LSP via make-before-break.
Last reviewed: Jun 18, 2026
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