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 corresponding to a VLAN is set
to '1', then the VLAN transits the local device either because it
was configured to or because it was selected to automatically by
the selection algorithm.