How about VSS feasibility on 3850? what IOS version will support VSS and can you provide me the configuration guide?
You've got to be joking right? VSS on a 3850?
Stacking comes natively with 3850 and you want to do VSS? You're "re-inventing the wheel".
Then you can use the 4500-X. ;)
Not sure what all the new Catalyst 9K series supports beyond stacking similar to Catalyst 3Ks.