I have 2 questions.
1. I have 2 Cores(core 1 and Core 2) 6509 connected back to back thru LACP. Can I connect a 6509(distribution) with 2 uplinks, one going to each Core and then activate multichassis Etherchannel. Note: This is a non VSS environement.
2. I have 2 Cisco 6504 with VSS enabled and I have one Nexus 7K with 2 VDC( VDC1 and VDC2)
Can I do multi-chassis etherchannel between the Nexus and the 6504 VSS with one link between VDC1 to the VSS and the other is between VDC2 and the VSS.
For you second question, the vPC is tied to a specific VDC, so you can only have your etherchannel to your VSS within the same VDC domain.
See this link:
"A vPC domain is associated to a single VDC, so all vPC interfaces belonging to a given vPC domain must be defined in the same VDC"
Hope that helps
I can answer only to your first question:
without VSS you cannot deploy an etherchannel that spans over multiple standalone C6500 chassis
Hope to help