Hi @Pluto ,
we undertook such a migration for a customer a couple of years back across their estate. Something like 15+ firewalls migrated to Meraki MXs.
It’s all in the prep. We went through every firewall rule on their Fortigates and documented them. The rules were reviewed with the customer and amendments made.
We then pre-configured the MXs prior to deployment and migrated over weekends and evenings to allow for issues to be resolved.
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.