Allied Telesis AT-GS950/8 - Manual (Page 202)

Chapter 15: Quality of Service and Class of Service
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5. Click Apply under the DSCP Mapping drop-down menu.
Note
You can disable DSCP class mapping by selecting Disabled from
the DSCP Mapping drop-down menu, then clicking Apply under the
DSCP Mapping drop-down menu.
6. For each DSCP In value that is relevant to your configuration, select a
queue (Low, Medium, High, Highest) in the Queue column.
To set all queues in a Queue column to the same value, use the
Queue drop-down menu in the first row to select a queue.
7. After you have completed this mapping process, click Apply.
To return the DSCP class mapping to the default values, click the
Reset to Default button.
8. From the main menu on the left side of the page, select Save Settings
to Flash to permanently save your changes.