Allied Telesis AT-2900 Series Adapters - Manual (Page 56)

Chapter 5: Setting Advanced Properties
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Figure 21. Advanced Tab
3. From the Properties list, select 802.1p QOS.
4. From the Values list, select one of the following:
 Enable - Enables the 802.1p QOS property.
 Disable - Disables the 802.1p QOS property. This is the default.
Note
Enabling 802.1p QOS requires an 802.1p-aware switch.
5. Click OK.
6. If prompted to restart your computer, click Yes.
Although it is not necessary to reboot the system for new adapter
properties to take effect, rebooting is recommended to reinitialize all
registers.
7. Verify that the adapter port LEDs operate as described in “LEDs” on
page 16.