The value of the object tmnxLocUsrDbDhcpMaskSufNum specifies
the number of characters to remove from the end of the incoming
string before it is matched against the value configured in the
corresponding object in the tmnxLocUsrDbDhcpTable.
At least one of the values of tmnxLocUsrDbDhcpMaskSufNum and
tmnxLocUsrDbDhcpMaskSufStr must be equal to the default value.