This field records how much the counter for total FCoE packets received on this interface, encapsulated FC frames and all changed during the specific collection interval this historical record captured — a frozen snapshot of that one interval's increase, not a live running total. For a network admin, network admins use this alongside bytesRx to compute average FCoE frame size, which helps spot when a host is sending unusually small SCSI command frames versus large data-transfer frames. For example, 738 packets in the last interval would be a normal burst of SCSI command and data frames for an active LUN.