Dell PowerConnect 3024 User Manual page 42

In the CoS Settings screen, you can specify the priority for each port on your switch.
Layer 3 Priority — DiffServ
DiffServ — You can change the default ToS priority by selecting Normal Priority or High Priority for each class of services. This setting leverages the
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IETF definition of the IPv4 Type of Service (ToS) octet in the IP packet-header by using the Differentiated Services Code.
Point (DSCP) field(6 bits) classifies packets into any of the 64 possible classes.
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