In a MERU (now Fortinet) single channel architecture wireless network it is normal that each AP transmits the same BSSID across the ESSID. However, if there is some slight configuration error on some APs then a situation can occur where in the same area there could be two BSSID on the same channel. This results in a hard handover when roaming and potentially client connectivity issues. Fortinet call this "broken virtual cell".
On visiting a building reporting issues with the wireless dropping connections I noticed in WinFi that there were two instances of each of our three SSIDs on channel 36:
The issue was that some of the APs were configured to 802.11an not 802.11ac causing them to create a different virtual cell.
The Fortinet documentation on this is located
here.
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