SMC Networks TigerStack 100 1000BASE-X Management Manual page 133

Use the menu shown below to assign ports to the specified VLAN group
as an IEEE 802.1Q tagged or untagged port. Assign ports as tagged if they
are connected to 802.1Q VLAN compliant devices, or untagged if they are
connected to VLAN-unaware devices.
Parameter
Untagged Ports
Note: If a removed port is no longer assigned to any other group as an
untagged port, it will automatically be assigned to VLAN group 1
as untagged.
Description
Adds an authorized egress port to the displayed VLAN as an
untagged port.
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