Transparent VLANs described as a bitmap. Each octet within this value
specifies a set of eight VLANs. The first octet specifies VLANs 1
through 8. The second octet specifies VLANs 9 through 16, and so on.
Within each octet, the most significant bit represents the highest
numbered VLAN, and the least significant bit represents the lowest
numbered VLAN.