Hi there .... I need to upgrade a pair (active/standby) of ASA from 8.2.5 to 8.4.3 ... I have a script created to modify all NAT rules I need, and I have tested it in lab, and I think I'm good with it.
Now, I want to figure out if there's a way to do this without an outage. Previously, when configuration were compatible between version, there was no problem. You could usually force secondary unit to be active, upgrade primary (rebooting), making primary the active again, and do the upgrade on secondary ... no outage at all
Now, as new software doesn't support old configuration, if I follow that process, as soon as I bring primary up with new software, it will try to get the configuration from the active one, which won't work ... Is there another option than having a short outage (turn off secondary acting as active, while primary is coming back with new software and configuration already changed?)