This action attribute, when specified, will cause the packet being evaluated to be sent to a predefined egress port for transmission in addition to the normal processing associated with the packet. Specification of the egress port or ports that will serve as the destination for mirrored data is beyond the scope of this document. Furthermore, note that data mirroring can potentially consume substantial resources at the egress. Oversubscription issues should be considered prior to specifying this action. Also note that the mirroring direction attribute in this same ntnQosActionExt entry determines the data that is mirrored. The packet that was 'received' by the device will be mirrored (i.e., packet modifications that may occur during processing will not appear in the mirrored data) when the mirroring direction attribute has the value 'ingress(1)'. The packet that is to be 'transmitted' by the device will be mirrored (i.e., packet modifications that may occur during processing will appear in the mirrored data) when the mirroring direction attribute has the value 'egress(2)'. A value of 'false(2)' indicates that this action will not be initiated.