OpenWRT Meraki MR33 Configuration

I've been running OpenWRT (up to 19.0.4 in the last couple of days) on a Meraki MR33 for a long time now, but I've never been able to figure out an optimal configuration. The MR33 is basically an AP set to forward DHCP and DNS to a separate server. It has three radios, one of which is designed for security and radio frequency scanning. I've tried a bunch of alternative configurations, but can't seem to get an optimal one.

Is there a suggested setup any of you might share? Should the scanning radio be disabled? If so, is this always Radio 0?

Here's a snapshot of the setup...

And the config/wireless is as follows...

config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11a'
        option path 'soc/40000000.pci/pci0000:00/0000:00:00.0/0000:01:00.0'
        option legacy_rates '0'
        option country 'IE'
        option channel 'auto'
        option htmode 'VHT40'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option encryption 'psk2+tkip+ccmp'
        option key '*******************'
        option ssid '101010'

config wifi-device 'radio1'
        option type 'mac80211'
        option hwmode '11g'
        option path 'platform/soc/a000000.wifi'
        option legacy_rates '0'
        option country 'IE'
        option channel '11'
        option htmode 'HT20'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid '101010'
        option key '*******************'
        option encryption 'psk2+tkip+ccmp'

config wifi-device 'radio2'
        option type 'mac80211'
        option hwmode '11a'
        option path 'platform/soc/a800000.wifi'
        option legacy_rates '0'
        option country 'IE'
        option channel 'auto'
        option htmode 'VHT40'

config wifi-iface 'default_radio2'
        option device 'radio2'
        option network 'lan'
        option mode 'ap'
        option key '*******************'
        option ssid '101010'
        option ieee80211w '1'
        option encryption 'psk2+tkip+ccmp'

Can you elaborate on what's "not optimal" about it?

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Key issues...

  • Inconsistent speeds whereas the OEM OS was stable
  • Signal strength lower than OEM OS
  • WiFi drops entirely from time to time
  • Unclear which radio is the scanning radio and whether it should be disabled

The AP never moves and isn't blocked by anything (which I know can mess with the 5GhZ band). Other than that, it just doesn't perform as well as with the OEM OS.

Just in followup to this. This morning, I changed the setup to all three radios being active, but set the security to AES only. Reconnected iOS, MacOS and Windows devices and speeds have been great and stability excellent. Not sure if it's related, but thought it worth sharing.

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