This action attribute, when specified, will cause the value contained in the user priority field of the 802.1Q frame to be updated based on the value of this object. No action is taken if the frame is untagged. Specifying a value equal to useDefault(9) means that the value for this attribute will be assigned based on default information maintained in the system. The value specified in the 'UpdateDSCP' attribute will be used to determine the default drop precedence. Note that specifying useDefault(9) means that assignment of a value for this attribute is implementation dependent. Specifying a value equal to ignore(10) means that no action will be taken related to this attribute. Note that the results of classification where actions specifying ignore(10) are applied are implementation dependent. Specifying a value equal to useEgressMap(11) means that the value for this attribute will be assigned based on DSCP-to-drop precedence egress map information maintained in the system. The DSCP value in received traffic will be used to determine the drop precedence. Note that specifying useEgressMap(11) means that assignment of a value for this attribute is implementation dependent.