This field is the average, as frozen at the moment this historical snapshot was taken, of the per-interval delta values for FCoE frames received with an error condition, such as a corrupted encapsulation header or an invalid embedded FC frame, taken across the retained collection history for this stats object. Admins watch this to separate a genuinely sustained problem from one noisy interval — if DeltaAvg for errorsRx on this interface is climbing, a jump here on a specific vHBA's FCoE interface is one of the first places to check when a host reports intermittent SAN path failures, rather than a one-off spike. For example, an average of 3 frames per interval sustained over many polling cycles points at a chronic issue rather than a one-time glitch.