This Gauge32 is the port number of this internal link on its local (Fabric Interconnect) side. It matters on the same internal chassis backplane link, but the record kept on the Fabric Interconnect (switch) side rather than the IOM/server side because it maps to a specific physical connector on the fabric interconnect chassis, which a technician references when reseating a cable or transceiver on that end. A portId of 31 on this link's fabric-interconnect side tells a technician exactly which fabric-interconnect port to physically inspect, as opposed to any port on the IOM side.