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For any of the LFA methods to work properly, there must be a router in...

For any of the LFA methods to work properly, there must be a router in the backup path that will forward traffic addressed to the destination without sending it back to the source. Which of the following statements describes the way R-LFA selects such a router?

A.

It selects an immediate neighbor.

B.

It selects a remote router, reachable through a tunnel defined by a single Node-SID.

C.

It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.

D.

It can select an immediate neighbor or a remote router, as long as the backup path coincides with the path that will become active after IGP reconvergence.

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