We now have MS425 in place for our distribution stack. All other IDFs connect to the MS425, We have RSTP running on all Cisco 2960x switches (MST is supposed to work but only if ALL are running MST). We still have the MS390 stack in place but they now only have servers (access ports) and AP trunks configured. This has been working for about a month (fingers crossed). The MS425 seems to be able to handle RSTP better than the MS390s. If I could start over with Meraki as the final solution, I would put in Meraki APs first, then Meraki MS in the IDFs, and THEN replace the core.
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