This read-only Counter counts frames received on this port that were shorter than the minimum valid frame length and were rejected as malformed. A steady trickle of short frames is often benign runt traffic from collisions on a shared segment, but a sudden increase on a previously clean port suggests a failing NIC or cable on an attached device generating malformed frames. This pairs with ciscoTsPortStatsLongFrames to give the two classic size-based frame-validity failure counters for this port.