A string of octets containing one bit per
protected VLAN from VLAN IDs 1 to 1024. The first
octet corresponds to VLAN IDs 1 through 8, the
second octet to VLAN IDs 9 through 16, etc.
Within each octet, the most significant bit
represents the lowest numbered VLAN ID, and the
least significant bit represents the highest
numbered VLAN ID.