A bit mask of the 802.1p tags associated with this class.
Each tag is represented by a single bit. If that bit is set
then the corresponding tag is selected by this class.
The following bits are currently defined:
8021pTag-0 0x01
8021pTag-1 0x02
8021pTag-2 0x04
8021pTag-3 0x08
8021pTag-4 0x10
8021pTag-5 0x20
8021pTag-6 0x40
8021pTag-7 0x80