SSID Hidden strange in Air Marshal

[DTellez]

Hello everybody.

We noticed in Air Marshal we see a Hidden SSID strange.

I don't know why Meraki see 1163 MACs address in broadcast, and emiting in multiples channels.

This SSID is seeing by all my APs, but in the AP01 and AP05 with 255 dB of signal over noise. This meaning is near to this radios.

I see multiples MACs with differentes OUIs (I attach an example).

This behavior is repeated in all the networks in all organizations I manage.

Anyone can explain me what is happened? I don't belive is a physical device putted, because it's repeated in all sites, and I doubt that.

Thank you.

[alemabrahao]

I suggest you use a wireless network analysis tool to analyze the traffic and identify patterns or anomalies.

I also suggest you check that you are running the most current firmware version and open a support case with Meraki.

[DTellez]

I don't believe something happend in the spectrum. This appear in all, more than 500, sites I manage.

[Ryan_Miles]

Note: A “hidden SSID” on the Air Marshal page is an SSID name that is not included in the beacons and probe responses for a particular BSSID. These can usually be ignored during common network operation, and are unlikely to result in noticeable RF interference. Administrators may specify the same allow list, contain, alert, uncontain rules for BSSIDs contributing to the hidden SSID's seen by selecting the Hidden row and selecting the Broadcast MAC to apply the rule to. 

https://documentation.meraki.com/MR/Monitoring_and_Reporting/Air_Marshal#Rogue_SSIDs_2

So, "Hidden" is a container for any SSID not sending its name in beacons and probes. Meaning it can be lots of SSIDs contributing to the count, MACs, APs seen by, etc.

[RaphaelL]

As mentionned by Ryan , pretty pretty sure this is normal. They all group up in one big bucket : 

Which also explains all the different BSSIDs ( MACs ) 

[DTellez]

With 255 dB of SNR? It's strange, it isn't?

[cmr]

Is it not related to meshing, do you have meshing turned on?

[DTellez]

I had it turned on. I turned off but as you see the SSID Hidden still appear.