I have two distribution switches that have a VSL link between the two. I'm having an issue trying to connect these 2 switches to 2 3750 stacked switches. The way i have it currently setup is that I have one connection from vss 1 and one connection from vss 2 to each 3750. The whole thing is is configured as one port-channel, but it doesn't seem to be working properly. Is there a different way I should be doing this?