I'm not sure if I have it title right. But I'll explain what I want to do.
Currently, I have a single Exchange server sitting behind my MX64. We are planning on deploying a second in an Active/Passive setup and only want to route traffic to the secondary server if the first one is down (Windows Updates, Exchange updates, etc). Is it possible to do this through the Meraki dashboard or would I have to write something that hits the API to update the 1:1 NAT mapping I currently have in place?