I am trying to stack two 460g2 via VIM-2x modules with exos 16.1.3, and have cabled them the VIM modules from S2 to S1 and S2 to S1 and they show link lights but do not form a stack. This works fine on the front panel ports but not the VIM. I noticed I had to run alternate as native mode is not supported on this module. Any thoughts on what I am missing? Thanks