Looking for a sample of the XML required to place an FC uplink into a VSAN.  Not having much luck grabbing the relevant XML from UCSM...
 

Is this what you are looking for?

Changing from Default VSAN to HDSTest1:
<configConfMos cookie="YOURCOOKIE" inHierarchical="false">
<inConfigs>
<pair key="fabric/san/net-HDSTest1/phys-switch-A-slot-2-port-1">
<fabricFcVsanPortEp adminState="enabled" dn="fabric/san/net-HDSTest1/phys-switch-A-slot-2-port-1" name="" portId="1" slotId="2" switchId="A">
</fabricFcVsanPortEp>
</pair>
</inConfigs>
</configConfMos>


Changing back to Default VSAN:
<configConfMos cookie="YOURCOOKIE" inHierarchical="false">
<inConfigs>
<pair key="fabric/san/net-default/phys-switch-A-slot-2-port-1">
<fabricFcVsanPortEp adminState="enabled" dn="fabric/san/net-default/phys-switch-A-slot-2-port-1" name="" portId="1" slotId="2" switchId="A">
</fabricFcVsanPortEp>
</pair>
</inConfigs>
</configConfMos>

Hope this helps!

Chris Atkinson