This textual convention can specify a VLAN range of 2k VLANs,
for example, 1 - 2048, 2049 - 4095, etc. Each octet within this value
specifies a set of eight VLANs. The first octet specifies first 8
VLANs of the range specified in the description, the second octet
specifies the next 8 VLANs, etc.
Within each octet, the most significant bit represents the lowest
numbered VLAN, and the least significant bit represents the highest
numbered VLAN. Thus, each VLAN of the device is represented by a
single bit within the value of this object. If the corresponding bit
is '1' indicates that VLAN is included in the set of VLANs;
'0' means the VLAN is not included.
Note that if the length of this object is less than 256 octets,
any 'missing' octets are assumed to contain the value zero.