The UDP sweep threshold interval is in microseconds. The
default threshold value is 5000. The valid threshold range is
1000-1000000.
By using the default settings, if a remote host has UDP
connection to 10 addresses in 0.005 seconds(5000 microseconds),
the security device flags this as an UDP sweep attack, and
rejects all further new UDP connections from that host for
the remainder of the specified threshold time period.
This attribute holds the UDP sweep attack threshold.