The method used to discard all incoming VLAN tagged frames
for the port specified by the indexing of this entry.
When this is enabled(1), the device will discard all 802.1Q
tagged packets received on this port.
When this is disabled(2), the device will NOT discard frames
received on this port based on the presence of an 802.1Q tag.
The behavior of this method in conjunction with the
dot1qPortAcceptableFrameTypes leaf of Q-BRIDGE-MIB [RFC2674]
is that of a logical OR.