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The option is configured or disabled by editing the configuration file /etc/dpi/fastdpi.conf.

Option's configuration:

Enable prioritizing markup of a traffic on level:
1 - IP header
2 - VLAN/QinQ header
3 - MPLS header

set_packet_priority=1

set_packet_priority=1 leads to patching of all packets that pass through DPI to set the priority in their headers. This operation takes a lot of resources. Therefore do not switch this flag on until you do not need to use these modified priorities on other network devices. Configuration parameters from Assignment of priorities are sufficient for internal DPI usage.