This read-only counter reports how many packets matching this row's specific DoS attack signature have been detected by the switch. Admins poll it to see how actively a given attack type, such as tcp-null-scan or ping-death-attack, is being triggered against the device, helping decide whether to keep protection enabled or investigate the traffic source. For example, if swDoSCtrlFrameCount on the row for ping-death-attack climbs rapidly, an admin knows the switch is actively fending off malformed oversized ICMP packets from that segment.