Forum Discussion
I am planning something similar, moving from one platform to another. My approach is to grab a block of IPs (or a specific VLAN) for virtual servers that can be bound to the new BigIP Platform. This allows the new system to be built up and and the virtual servers to be migrated and tested without interrupting production and then when you are ready, you can switch the DNS entries to the new VS address on the new platform.
While trying to make disparate platforms work as an HA pair may be possible, I think there are too many variables to account for and it leaves you without a viable test environment before the "cutover". A consideration for me is I will be going from a legacy 9.4.3 config to a 10.2 system and attempting to cure the configuration sins of previous admins.
Hope This Helps,
Carl B