StackWise Virtual, can we use same interface for Virtual link and Fast hello(Dual link active detection) ?

[azhar_eaggle1]

can we configure dual-active link Detection/Fast Hello and Virtual Link on the same interfaces?

hardware model is C9500-40X. the customer wants to save the interfaces and trying to find a way, if there is a way to use only 1 interface(physical or in PO) for both fast hello and Virtual link. 

[balaji.bandi]

You can not mix, here is the detailed design guide :

https://www.cisco.com/c/dam/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.pdf