Allied Telesis AT-S25 - Manual (Page 134)

Section II: Local and Telnet Mangement
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Figure 46 Show All VLANs Window
2. A list of all created VLANs is displayed.
3. To check that a VLAN contains the appropriate ports, type D to select
a VLAN ID and press the Enter key.
The Display VLAN Ports window is displayed with a list of ports
associated with the selected VLAN.
4. Press the Esc key or type R to return to the VLAN Definition menu.
Note
When you create a new VLAN, ports designated as untagged ports
of the new VLAN are automatically removed from their current
untagged VLAN assignment. For example, if you are creating a new
VLAN on a switch that contains only the Default_VLAN, the ports
that you specify as untagged ports of the new VLAN are
automatically removed from the Default_VLAN.
Tagged ports are not removed from any current VLAN assignments
because tagged ports can belong to more than one VLAN at a time.