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?
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?
The configuration on router R1 shows that both Remote Loop-Free Alternate (R-LFA) and Topology Independent Loop-Free Alternate (TI-LFA) are enabled. When multiple backup paths are available, R-LFA is generally preferred because it provides a backup path that avoids loops and does not coincide with the path taken by the IGP after re-convergence. The configuration with 'node-protect' further ensures that the backup paths provide node protection. Therefore, router R1 will use an R-LFA path that would not coincide with the path after IGP re-convergence.
Might be A due to max-sr-frr-labels = 1 limiting it to R-LFA and LFA with LFA being the preference
D should be the answer as TI-LFA has the highest precedence over LFA and R-LFA, TI-LFA must coincide with the re-convergence path