This read-only INTEGER (0-2147483647) counts, per ifIndex, the number of packets received since the last single-host-violation trap was sent, relevant only while in single-authorized mode with trapping enabled, per the description. Admins use it to gauge how much unauthorized traffic has accumulated between violation alerts on a given port, indicating whether an intrusion attempt is a one-off or sustained. For example, a rapidly increasing count here between traps would tell the admin that a specific single-host port is experiencing a continuous stream of unauthorized packets rather than an isolated attempt.