When this is admitOnlyVlanTagged(2) the device will
discard untagged frames or Priority-Tagged frames
received on this port. When admitAll(1), untagged
frames or Priority-Tagged frames received on this port
will be accepted and assigned to the PVID for this port.
When this is admitOnlyUntaggedAndPriorityTagged the device
will recieve only untagged and priority tagged frames on
this port.
This control does not affect VLAN independent BPDU
frames, such as GVRP and STP. It does affect VLAN
dependent BPDU frames, such as GMRP.