This object reports the MPLS label for the dynamic encap tunnel, as the description states, but unlike the static tunnel's manually assigned label, this value is normally learned automatically through RSVP-TE signaling. The syntax specifically allows -1, which accommodates the case where no label has been signaled yet -- letting a monitoring script distinguish 'not yet established' from a genuine label value of 0. For example, this object reading -1 while a tunnel is still being signaled, then changing to a real value like 100045 once the LSP successfully comes up, is the expected sequence for a healthy dynamic tunnel establishment.