This object reports the current operational state of a sham link, which for this link type only has two meaningful values, down or fully-formed point-to-point, unlike regular OSPF interfaces that pass through several intermediate states. It matters as the simplest, most direct answer to whether this backdoor-link-masking sham link is actually working, since there is no partial or transitional state to interpret. Seeing this stuck at down when the underlying MPLS VPN path is otherwise healthy would point an admin toward checking the Hello or dead interval mismatch or an OSPF authentication issue rather than a transport-layer fault.