Allowed VLAN list
The allowed VLAN list for each port specifies the VLAN tag values for which the port can transmit or receive frames.
For a tagged frame arriving at an ingress port, the tag value must match a VLAN on the allowed VLAN list or the native VLAN.
At an egress port, the frame tag must match the native VLAN or a VLAN on the allowed VLAN list.