Question concerning migration on LTM

Hello,

I would like to have your advice concerning F5 migration (and more precisly migration from old F5 hardware to new F5 hardware).

I thought about different method of migration:

1. One shot migration (tested without problem).
2. Migration with modification from old VIP to new range and modification on client side or DNS (tested without problem).

I have thought of a third method (the architecture is organized around "one arm architecture" and auto-map SNAT):

- I keep all of my VIP address on the new architecture as on my old F5.
- I desactivate VS address on all VIP, desactivate ARP and ICMP echo.
- I connect the new architecture in parallel as the old.

=> As a consequence both architecture are in production, only the old F5 respond to VIP request (because ARP and ICMP echo are desactivate on new architecture).

=> When I want to migrate a VIP I just have to do:

- On old architecture desactivate VS address + ARP and ICMP echo.
- On new architecture activate VS address + ARP and ICMP echo.

Some of you have already have done this method? Do you think this method can work or have impact?

Thank you for your advice.

M.