This reports the administrative state, enabled or disabled, of the parent interface that this VSAN membership record belongs to. An admin checks this to distinguish a membership problem caused by the VSAN configuration itself from one that's simply because the underlying FC port has been administratively disabled, which changes where the fix needs to happen. A parent admin state of disabled would explain why this VSAN's membership record for that port shows no activity - the port itself is shut down, independent of any VSAN-specific issue.