D-Link DES-3010FA/GA User Guide
•Trust Mode — Defines which packet fields to use for classifying packets entering the device. When no rules are defined, the traffic containing the predefined packet CoS field is mapped according to the relevant trust modes table. Traffic not containing a predefined packet field is mapped to best effort. The possible Trust Mode field values are:
–CoS — Classifies traffic based on the CoS tag value.
–DSCP — Classifies traffic based on the DSCP tag value.
2.Select Enable in the Quality of Service field.
3.Define the Trust Mode field.
4.Click 
. Quality of Service is enabled on the device.
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