This object sets the maximum threshold, as a percentage of the 256KB queue size, at which all packets, red, yellow, and green alike, are discarded regardless of color. Administrators use it as the hard congestion ceiling for a queue, ensuring the queue never grows unbounded even if lower-priority colors haven't fully cleared space. For example, once queue occupancy passes this maximum threshold, even green traffic would start being dropped to prevent the queue from overflowing.