SKAT DPI allows to modify the value in priority field of the packets that pass it. This modification depends on the detected protocol. The following fields are supported:

DSCP/TOS in IP packets' headers.

Priority in VLAN and QinQ packets.

Traffic class in MPLS packets' headers.

A router or shaper can now utilize this marking to provide the required QoS for specified protocols - even in case they have no own DPI capabilities.