D-Link DGE-560T - Gigabit PCI-Express SNMP VLAN Flow Control Network Adapter User Manual page 35

Click the Advanced tab.
Use the Advanced Configuration menus to configure 802.1p, select 802.1p.Support from the Property list and select On to enable or Off
to disable from the Value drop-down list menu.
Other advanced configuration features that can be changed or enabled include Flow Control, Jumbo Frames, Log Status Messages,
Transmit and Receive buffers and others.
D-Link DGE-560T User Manual