The cumulative number of UplinkFast transitions (from
the STP 'Blocking' state directly to the STP 'Forwarding'
state). All transitions are included in this counter,
irrespective of the instance of the Spanning Tree
Protocol on which they occur.
If the platform supports the stpxUplinkFastOperEnabled
object, then this object is not instantiated when the
object value of stpxUplinkFastOperEnabled is false(2).
If the platform does not support the
stpxUplinkFastOperEnabled object, then this object is
not instantiated when the object value of
stpxSpanningTreeType is mst(4).