This read-only Gauge32 counts undersized (runt) Ethernet frames received on this port during the current 15-minute period. It helps an administrator spot a failing NIC or a bad cable segment upstream of the port, since runts typically indicate a collision or hardware fault truncating frames. For example, a technician seeing a high runt count on one port would check that port's cable and the attached ComPort's transceiver before suspecting the HCX card itself.