The value of sysUpTime on the most recent occasion at which any
one or more of this RSVP Session's counters suffered a
discontinuity. The relevant counters are jnxRsvpSessionMplsOctets and
jnxRsvpSessionMplsPackets. If no such discontinuities have occurred
since the last re-initialization of the local management subsystem,
then then this object contains a zero value.