Are you using Sup-720-VS?
Simply connect the Sup from sw1 to Sup in sw2 and the same for line card.
Post your VSS and Etherchannel configs from both switches
Thanks for the feedback
My intention was for sup level redundancy,
If one sup fails will standby sup will able to handle other 16 link cards?
Thanks and Regards
In current VSS deployment, when the primary Sup fails the stand-by switch will take over.
Remember when the sup fails the entire switch is out of commotion including the line cards. The second sup will take care of the line card in that switch and not the first one.
Here is more info on VSS deployment: