This read-create Unsigned32 sets the maximum drop probability applied to yellow (excess) packets once the queue reaches the threshold defined by the yellow max queue threshold object on an F3 network port's QoS shaper. Administrators raise it to more aggressively discard excess traffic under sustained congestion. For example, setting this probability high on a port frequently oversubscribed by bursty excess traffic keeps committed-rate traffic protected by shedding yellow packets more readily.