This object represents the VSAN of the port
on the local device thru' which the device
represented by the corresponding instance of
cdpvmDiffLoginDev object, logged-in. It was
copied from either the cdpvmLoginDevVsan
object in the cdpvmTable or from
cdpvmEnfLoginDevVsan object in the
cdpvmEnfTable at the time when the comparison
was done.