Description: A string of octets containing one bit per VLAN in the management domain. The first octet corresponds to VLANs with VlanIndex 1 through 8; the second octet to VLANs 9 through 16; etc. The most significant bit of each octet corresponds to the lowest value VlanIndex in that octet. If the bit correspond to a VLAN is set to '1', then the VLAN is a configured transited VLAN on the local device. (Default VLANs which must transit the local device are always considered to be 'configured transited VLANs'.) Any attempt to set a bit string which has: more bits set than the local device can transit; or does not have all bits set corresponding to default VLANs which must transit the device; or set any bits corresponding to non-existant VLANs (VLANs whose IDs are not defined in the management domain) will be completely rejected as an illegal value.