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 a VID based on the
PVID and VID Set for this port.
This control does not affect VLAN-independent Bridge
Protocol Data Unit (BPDU) frames, such as GVRP and
Spanning Tree Protocol (STP). It does affect VLAN-
dependent BPDU frames, such as GMRP.
The value of this object MUST be retained across
reinitializations of the management system.