Question

A service provider deploys RSVP-TE tunnels across its core. The network team wants sub-50ms recovery if the next-hop router of a protected tunnel completely fails, not just a link. They configure MPLS TE Fast ReRoute (FRR) with a backup tunnel. Which backup tunnel design ensures traffic is protected against the failure of the immediate downstream P router?

Accepted Answer

A next-next-hop (NNHOP) backup tunnel that terminates on the node two hops downstream, bypassing the protected next-hop router

Answer

A next-hop (NHOP) backup tunnel that terminates on the next-hop router along the protected LSP

Answer

An autoroute-announced backup tunnel that shares the same path as the primary tunnel

Answer

A backup tunnel configured with the same explicit path and affinity as the primary LSP