Nokia Service Routing Architect 4A0-116 Question # 12 Topic 2 Discussion
4A0-116 Exam Topic 2 Question 12 Discussion:
Question #: 12
Topic #: 2
The exhibit shows the fast re-route configuration on router R1, in which both R-LFA and TI-LFA have been enabled. Assume that there are multiple potential backup paths for a given prefix. Which of the following options will router R1 use?
A.
A standard LFA path that would not coincide with the path after IGP re-convergence.
B.
An R-LFA path that would not coincide with the path after IGP re-convergence.
C.
A D-LFA path that would not coincide with the path after IGP re-convergence.
D.
A D-LFA path that would coincide with the path after IGP re-convergence.
The exhibit shows that both R-LFA and TI-LFA have been enabled on router R1. R-LFA (Remote Loop-Free Alternate) is a method that is used to protect the active segment of a tunnel, and it allows the router to find a backup path that coincides with the path that will become active after IGP reconvergence. TI-LFA (Topology Independent LFA) is a method that is used to protect an end-to-end multi-segment tunnel, it allows the router to find a backup path that does not rely on the IGP topology, but on the segment routing topology.
With R-LFA and TI-LFA enabled, router R1 will use a D-LFA (Dual-Loop-Free Alternate) path, which is a combination of both R-LFA and TI-LFA, this path will coincide with the path after IGP re-convergence.
A standard LFA, R-LFA, and D-LFA which do not coincide with the path after IGP re-convergence are not the options.
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