Priority override allows you to define and force the traffic to a desired priority level. Priority override can be used with any combination, as displayed in Relationship Between Service Class and 802.1D UP. You can configure the service class and the DSCP values.
When Priority Override is enabled, the configured service class overrides the queue selection in the inbound and outbound directions, the 802.1P UP for the VLAN (Virtual LAN) tagged Ethernet packets, and the UP for the wireless QoS packets (WMM or 802.11e) according to the mapping in Service Classes. If Priority Override is enabled and the VNS is not locally bridged, the configured DSCP value is used to tag the IP header of the encapsulated packets. The AP does not override the DSCP in the IP header of the user packet.