> QoS -- Queue Management Configuration
> If Enable QoS checkbox is selected, choose a default DSCP mark to automatically mark incoming traffic without reference to a particular classifier. Click 'Apply/Save' button to save it.

> Note: If Enable QoS checkbox is not selected, all QoS will be disabled for all interfaces.
> Note: The default DSCP mark is used to mark all egress packets that do not match any classification rules.

> | Enable QoS

> Select Default DSCP Mark |