I have to upgrade a FWSM from 3.1 to 4.0(10). I have some doubts to this respect:
1. May I do it directly or I need an intermediate jump before (let's say 4.0(0))?.
2. Once I upload the new version and reboot the appliance, it will detect the newest version and boot with it? (in that moment there will be 2 versions on the fw), I don't see the boot command like routers to specify.
2. If the appliance behaviour is not the expected once done the upgrade (it's a critical firewall), how can I back to the previous scenario?. Of course, I'll do a configuration backup but the commands nomenclature from 3.1 to 4.0. Do I must load the previous config file and erase the new version from flash?.
Thanks a lot,
I would make sure both cf:4 and cf:5 have the same 3.1.4 code. Your config which is in version 3.1.4 will be in both cf:4 and cf:5. Either copy and paste or tftp the file.
The you upgrade either cf:4 or cf:5 to 4.x and when that partition loads 4.x it will automatically convert the config to 4.x
when you boot cf:4 - you will have 3.x image and 3.x config
when you boot cf:5 - you will have 4.x image and 4.x config
For the questions to pkampana, you can find 3.1.4 here http://www.cisco.com/cgi-bin/tablebuild.pl/cat6000-fwsm
For the question to kusankar, when you boot to a new partition you will need to copy the config since each partition has its own config. So, the 3.1 config will be converted to 4.0 and each of your partition will have the right version with the corresponding config.
I hope it helps.