- Check this thread : https://community.cisco.com/t5/network-access-control/upgrade-ise-from-2-7-to-3-1/td-p/4546920 , albeit opinions do differ look at my arguments for an 'offline path' in the upgrade process.
-- ' A nun once asked a penguin ' do you think the earth is flat ? ; the penguin replied :
Madam, it all depends , in Riemann geometries the earth can be perfectly flat! The nun thanked him , he tripped and fell forward : the poor animal had forgotten that he might be living in a Riemann geometry too!