This read-create Unsigned32 sets the minimum queue depth at which WRED begins probabilistically dropping yellow (excess, out-of-CIR) packets on an F3 network port's QoS shaper. Administrators lower this threshold to start shedding excess traffic earlier during congestion, protecting the committed-rate green traffic. For example, setting a low yellow minimum threshold on a port serving mixed committed and best-effort traffic ensures excess traffic is trimmed well before the queue threatens to overflow and affect green traffic.