This field records the local physical port number that this FC monitoring session's destination port maps to on its fabric interconnect or fabric extender. For the physical FC port designated to receive the mirrored/copied traffic for an FC monitoring session, this port number is the piece of information an on-site technician actually needs to find the right physical port on the chassis, since the DN alone is not something you can read off a faceplate. For instance this instance might report port 34, meaning it corresponds to the physical port labeled 34 on that switch's faceplate.