This read-create Unsigned32 sets the queue depth at which WRED drop probability for yellow packets reaches its maximum on an F3 network port's QoS shaper, working together with the yellow minimum threshold to define the drop curve. An administrator configures it to determine how aggressively excess traffic is shed as the queue approaches full. For example, narrowing the gap between the yellow min and max thresholds makes the shaper ramp up dropping of excess traffic more sharply as congestion increases.