TIP OpenWiFi 2.0
Multiple Pre Shared Key is a popular configuration option in Multi Dwelling Unit, dormitory or similar environment where it is costly to implement complex 802.1x security however that same level of per-client security is highly desired.
A SSID when configured for multi-psk can have multiple PSK/VID mappings. Each one of them can be bound to a specific MAC or be a wildcard.
Note: M-PSK passwords must be unique per vlan-id as the device will attempt to match security key to assigned virtual lan. In the above example, a password of OpenWifi will match the untagged interface of the SSID and unique password of "akey" will match client(s) to virtual lan 100.