xVlanConfigAdmitConfiguredVlansOnly 1.3.6.1.4.1.838.3.34.1.2.1.2

Whether only those 802.1q tagged frames that contain a VLAN ID that has been configured on the box will be received. If this value is true, frames from VLANs with other VLAN IDs will be dropped. This variable does not apply to bridged traffic.