This read-only PerfCounter64 counts Frames Random Early Discard, Dropped by this network port's QoS shaper during the interval, meaning frames proactively discarded by WRED before the uplink's queue became completely full. A nonzero count shows an administrator that congestion management is preemptively shedding some replicated or aggregated traffic on the network port to avoid a harder tail-drop event. For example, a moderate f3NetPortQosShaperStatsFREDD alongside zero tail drops on the same uplink suggests WRED is successfully smoothing out a traffic surge before it becomes a hard outage.