Because of recent network failures, additional circuits have been purchased. In addition, Fast reroute has been configured on critical MPLS LSPs. When the next failure occurs, which two time intervals will affect fast reroute? (Choose two.)
A.
The amount of time required to reroute the traffic onto the detour
B.
The amount of time to detect a link or node failure
C.
The amount of time required to recalculate the best detour
D.
The amount of time it takes to ping the gateway on the detour link
Answer A and B seems to be correct
The time required for a fast-rerouting detour to take effect depends on two independent time intervals:
Amount of time to detect that there is a link or node failure—This interval depends greatly on the link layer in use and the nature of the failure. For example, failure detection on an SONET/SDH link typically is much faster than on a Gigabit Ethernet link, and both are much faster than detection of a router failure.
Amount of time required to splice the traffic onto the detour—This operation is performed by the Packet Forwarding Engine, which requires little time to splice traffic onto the detour. The time needed can vary depending on the number of LSPs being switched to detours.
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