Allied Telesis AT-S39 - Manual (Page 281)

AT-S39 User’s Guide
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example, if you are creating a VLAN called Sales that will span three
switches, you must assign the same VID value to each Sales VLAN on
the three switches.
Note
A VLAN must have a VID.
7. If you want all received traffic on the ports of the VLAN to be mirrored
to another port on the switch, select the mirroring port from the
Mirroring Port pull-down menu.
This feature is useful when troubleshooting a VLAN. You can analyze
the VLAN traffic by placing a network analyzer on the mirroring port.
In most cases, you should not change this parameter’s default value
of “
— “. This value disables port mirroring.
Note
For background information on port mirroring, refer to Port
Mirroring Overview on page 93.
8. To select ports for the VLAN, click on the appropriate ports in the
switch image.
Clicking repeatedly on a port toggles the port through the
following possible settings:
Untagged port
Tagged port
Port not a member of the VLAN
9. Click Apply.
Note
The untagged ports that you assign to the new VLAN are
automatically removed from their current VLAN assignment.
The user-configured VLAN is now ready for network operations.
For additional information on user-configured VLANs, refer to
User-Configured VLANs on page 121