This value classifies the physical interface type of this internal backplane link, distinguishing categories of physical endpoint within UCS Manager's port model. 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 ifType is one of the fields UCS Manager uses internally to decide which set of configuration options (speed, mode, transceiver checks) are even valid for this specific port. On this backplane link, an ifType of physical confirms this record represents a real hardware backplane port rather than a virtual or aggregated construct layered on top of it.