This read-create integer specifies which switch port will receive a copy of the mirrored traffic, with the restriction that a trunk member port cannot serve as this target. An administrator connects a packet-capture device or analyzer to the port configured here to observe the traffic being mirrored from the source port. For example, an operator would set swPortMirrorTargetPort to the port where their protocol analyzer is physically connected, ensuring it isn't part of an active trunk group.