This Gauge32 is the port number of the object on the far end of this internal backplane link. It matters on the internal Ethernet link that carries a blade's traffic from the chassis I/O Module up to a Fabric Interconnect over the backplane because it lets an admin identify exactly which physical port on the fabric interconnect corresponds to this internal server-side port without having to open the peer object separately. A peerPortId of 11 on this backplane link means this internal link terminates on port 11 of the fabric interconnect, which is where a cabling check should focus if the link won't come up.