Shados,I don't want to discourage anyone else from replying, but after 12 days it's not clear that they will. My suggestion would be to talk to your account team if you have one or our sales staff if you don't: https://www.cisco.com/site/us/en/about/...

The purpose of STP is to create a redundant loop-free topology in layer 2. If you're operating from the assumption that the network won't change, you might as well just make it loop-free in layer 1. You're free to pursue any design, but you requested...

You would be subject to this bug which only affects non-root domains with peer-switch: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa83042The defect was never and likely will never be fixed because the design [peer-switch on non-root] is unsuppo...

Pavel is correct.Note: The vPC Peer Switch enhancement is only supported on a vPC domain which contains the root for all VLANs.https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/nx-os-software/217274-understand-virtual-port-channel-vpc-en....

Ravi,   Generally speaking, anything not listed in Table 2 would be supported without a license: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/licensing-options/cisco-nexus-licensing-options-guide.htmlEric