"Devices bound to a template sort of update at the same time, when you schedule them for say 11pm on Saturday, they will update at 11pm on Saturday for their local network time. Meraki will automatically stagger these upgrades in 15 minute intervals to prevent stressing the Meraki cloud." I don't believe this to be correct. I've upgraded the firmware for an MX templated network with 200 odd networks. If the devices were staggered 15 minutes apart it would have taken 50 hours to complete. "Usually switches will perform the upgrade with the 'furthest' switch. So the CORE would be last for example. Access points is a hit or miss in my experience. The upgrade itself has no impact, it is only when the device reboots that there is any downtime. That is unavoidable." I don't believe this to be correct. All switches in the network initiate the download. They wait 20 minutes to give all the other switches a chance to complete their downloads, and then initiate a reboot. With regard to using staged switch upgrades tool, you select the time to upgrade the network. Then you use the staged switch upgrade feature to move the upgrade time for specific switches so that they happen earlier than the originally scheduled time. Any switch not specified in the stage upgrade tool gets done at the originally scheduled time.
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