Exam 4A0-116 Topic 2 Question 1 Discussion

Actual exam question for Nokia's 4A0-116 exam
Question #: 1
Topic #: 2

An SR-TE LSP with a path definition that includes router R4 as a loose hop and for which Seamless-BFD has been enabled is following the path shown in the exhibit. What happens after router R4 fails if the routers along the path follow the default behavior?

A. The head end will periodically try to calculate a new path at a rate defined by the retry timer. B. The head end will periodically try to calculate a new path at a rate defined by the resignal timer. C. The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure. D. The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.

Suggested Answer: C Vote an answer

When an SR-TE LSP with Seamless-BFD enabled, the BFD sessions are established between the routers along the path to detect any failures quickly. If a failure happens in the path, the router will stop forwarding the traffic and send a BFD control packet to the head-end router. In this case, R4 failed, BFD sessions will detect the failure and send a message to the head-end router, but since R4 is a loose hop, the path doesn't have to be re-calculate. The head-end router will continue forwarding traffic to the current next-hop, R2, which will be discarded at the point of failure (R4) as it doesn't know about the failure. And the traffic will not be redirected to R3 after IGP reconvergence.

by Quennel at Jan 29, 2025, 02:36 PM

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