FortiWLC – Virtual Cell Overflow Feature

Virtual Cell Overflow Feature

This feature, called Vcell Overflow, works by pairing a Virtual Cell ESS with a non-Virtual Cell ESS. The overflow ESS automatically inherits the parameters of the Virtual Cell ESS (except the setting for Virtual Cell). The non-Virtual Cell ESS is not used unless the Virtual Cell ESS is maxed-out; when this happens, the Virtual Cell ESS overflows into the other ESS as needed. The two ESS Profiles share same SSID so that clients seamlessly move back and forth. The overflow decision is based on the percentage of airtime spent on beacons crossing a threshold; when the percentage reaches 50%, clients start to overflow.