I apologize for resurrecting this old post, but did anyone ever figure out what the issue was? I basically have the same issue. A rogue AP with a hidden SSID, showing 2100 different broadcast MACs. This AP has been seen by almost all our APs across 4 floors. There are 2 wired MACs one for Meraki and the other for a users iMac. I checked the iMac, sharing is turned off, we also completely disabled the wifi and the rogue AP is still there. I am out of ideas and am starting to wonder if its the Merakis themselves.
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