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. Specifying a value equal to 'deriveFromIngressTosPrec(9)' means that the value for this attribute will be assigned based on the value of the precedence bits in the IP Type-Of-Service (TOS) field, as defined in RFC 791. The eight precedence values, also referred to as Class Selector (CS) values, have a one-to-one correspondence with the eight 802.1p user priority values. Specifying a value equal to 'deriveFromIngressDscp(10)' means that the value for this attribute will be assigned based on DSCP-to-user priority map information maintained in the system. The DSCP value in received traffic will be used to determine the user priority. Specifying a value equal to 'deriveFromEgressDscp(11)' means that the value for this attribute will be assigned based on DSCP-to-user priority map information maintained in the system. The DSCP value specified for remarking in the ntnQosBaseActionUpdateDscp attribute will be used to determine the user priority. Specifying a value equal to 'ignore(12)' means that no action will be taken related to this attribute. Specifying a value equal to 'markAsPriorityCopy(13)' means that the priority is updated based on the user priority field in the outer vlan tag. The priority copy functionality can be used for 802.1ad double tagged traffic where the priority field in the service provider vlan tag can be copied from the user priority in the customer vlan tag.