Hello,
I just did a test of DMVPN and IPSEC on the 6880-X switch. It works without any problems. I didn't test FlexVPN. I'd have to say that it doesn't work. I don't see it listed in the CFN.
For DMVPN I was told by TAC that I need 15.1(2) or later running ADVENTERPRISEK9 software. I'm not sure what the max throughput of it would be though. I can't find that documented anywhere. The only oddity that I've found is that none of the dmvpn specific show or debug commands are there, nor did the status messages get logged. But it did function.
Ethan
