Running 28.6.1 on 144 MR56. They are roughly 30 feet apart across 8 floors using VLAN for each floor. I've implemented 5GHz band steering and for the most part it to place systems on 5Ghz. Also changed radio profile to reduce power and increase bit rate as much as possible to support legacy systems and iPhones. Its 100% wireless shop with about 800 computers but still get some users mainly complain MS Teams meetings. I haven't implemented L3 roaming yet but seems like some systems connect to other floors. They get IP for that VLAN but signal to computer is low so I'm not sure L3 roaming would help with that. On my work laptop I changed the wireless adapter driver settings to roaming aggressiveness to high, transmit power to medium, and 5Ghz preferred because there were a few areas that I noticed that I still got 2Ghz. When no one is in the building I can see the LED go from green to blue within seconds and latency may jump a bit while it changes but nothing real bad. Only concern is that the driver settings on systems might be a little more challenging to change. The other annoying issue is that he APs loose connection to the dashboard. I've contacted Meraki about this and they said that its a known issue and new firmware should address it. I was also informed from Meraki that reboot needed to be done because it APs would have performance issues after about 2 months. Since we have MS switches I was able to put in a port schedule on the uplink ports to do it on a weekly basis. Unfortunately the port schedule settings don't have a monthly setting so that was the longest period I could schedule. If you are running med or high density, I'm curious on what your experience has been.
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