Information About Multi-Preshared Key
Multi-PSK feature supports multiple PSKs simultaneously on a single SSID. You can use any of the configured PSKs to join the network. This is different from the Identity PSK (iPSK), wherein unique PSKs are created for individuals or groups of users on the same SSID.
From 16.10 onwards, each SSID supports five PSKs, which can be extended
In a traditional PSK, all the clients joining the network use the same password as shown in the below figure.
But with multi-PSK, client can use any of the configured pre-shared keys to connect to the network as shown in the below figure.
In Multi-PSK, two passwords are configured (deadbeef and beefdead) for the same SSID. In this scenario, clients can connect to the network using either of the passwords.