This flag indicates if an intrusion has occured
on this port. Security-related LED(s) on the
device will blink if any instance of this flag
has the value intrusion. Setting this flag to
noIntrusion will turn off the appropriate LED(s).
An intrusion will only cause an alarm and an
intrusion log entry if this flag is equal to
noIntrusion. On a switch, packets causing
intrusions will be not be forwarded.