This field records the local physical port number that this VLAN-on-port-channel record maps to on its fabric interconnect or fabric extender. For one VLAN as it is provisioned on a specific Ethernet uplink port-channel (a bundle of physical uplink ports trunked together) on the fabric interconnect, 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 22, meaning it corresponds to the physical port labeled 22 on that switch's faceplate.