This field reports the cumulative count of FCoE frames the adapter attempted to send but discarded instead of transmitting, tracked by this particular stats object since it was created or last reset. For a network admin, this usually tracks a congested or paused fabric-facing uplink, since FCoE relies on Ethernet PFC pause frames to avoid loss and a spike here means that pause mechanism is being overwhelmed. For example, a cumulative value of 42 frames since the interface came up would still be within a tolerable range, whereas a rapidly climbing count in the hundreds would justify escalation.