Milan Technology MIL-SM2401M-STK - Manual (Page 180)

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Port VID
To configure port VID settings:
From the main 802.1Q VLAN page, select Port VLAN ID Settings.
Port VLAN ID
Set the port VLAN ID that will be assigned to untagged traffic on a given port.
This feature is useful for accommodating devices that you want to participate in
the VLAN but that don’t support tagging. Only one untagged VLAN is allowed
per port. Other VLANs need to be tagged. The VLAN ID must be the same as
the VLAN ID of the port that belongs to the VLAN group, or the untagged traffic
will be dropped.