The following setup document outlines the steps for a vMX creation in Azure. In reality, when you create the network you could clone the network where your existing DC MX is sitting. I'd probably start with a greenfields design for the Azure side as I'd assume there would be some form of co-existence with the existing DC network and you'd therefore want to ensure there isn't overlapping addressing etc. https://documentation.meraki.com/MX/MX_Installation_Guides/vMX_Setup_Guide_for_Microsoft_Azure
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