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ASASM question

I have a design requirement that needs using ASASM on a 6509.

The upstream device are a single physical trunk link that connects to the 6509. Below is the drawing:


I understand I need to assign a port on the 6509 as a trunk port. It became trouble for me between the MSFC and the ASA (IN RED).

Is this configure as a trunk link as well? I guess my working option would be configured as an access link.

In that case, it became simplier since it has only one logical outside interface on the ASA.

It seems i would not be able to configured as trunk (between the MSFC and ASA) anyway, since the ASA will be pointing to a single ip (gateway) at the MSFC anyway, right? and also, there will be multiple subinterfaces on the ASA.

Just want to throw in here if anyone has experience on this before. thank you.