Allied Telesis AT-S41 - Manual (Page 207)

AT-S41 User’s Guide
207
4. Click the Apply button.
Once a new PVID has been assigned to a port, the port is an untagged
member of that VLAN and only that VLAN.
If the port is also an tagged member of any VLANs, it remains as a
tagged member of those VLANs.
5. Repeat steps 2 and 4 to assign new PVIDs to any other ports in the
stack that are to be untagged members of the VLAN.
This completes the procedure for modifying a VLAN.