This reports whether specifically the reverse-direction LSP of an associated pairing is currently up and forwarding return traffic, tracked independently of the forward leg. An admin checks this when customers report they can send traffic but responses never arrive, since that symptom points squarely at a reverse-leg failure rather than the forward path. For example, a reverse oper state of down while the forward leg reads up matches exactly the symptom of one-way traffic loss customers would report as 'connects but nothing comes back'.