Dell PowerConnect 5524P User Manual page 660

Global Settings
Use the Global Settings page to enable Trust on all interfaces on the switch.
This configuration is only active when the QoS mode is Basic. Packets
entering a QoS domain are classified at the edge of the QoS domain.
For more information on setting Trust mode on an interface, see "Interface
Settings" on page 664.
To define Trust configuration:
1 Click Quality of Service > QoS Basic Mode > Global Settings in the tree
view to display the Global Settings page.
Figure 22-8. Global Settings
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Dell PowerConnect 55xx Systems User Guide