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. Over-subscription issues should be considered prior to specifying this action. A value of 'false(2)' indicates that this action will not be initiated. If this operation is requested and 'drop' has been specified, the packet will be mirrored to the specified port and not forwarded by the system. Specifying 'true(1)' when 'drop' has not been specified will cause a copy of the packet to be mirrored and the packet itself will receive normal forwarding treatment.