The authentication single-access command configures the device to allow users to access in only one authentication mode.
The undo authentication single-access command restores the default setting.
By default, the device allows users to access in different authentication modes.
After hybrid authentication is configured, the device by default allows users to access in different authentication modes. You can run the authentication single-access command to disable this default function. The device then allows users to access in only one authentication mode and does not process the packets of other authentication modes.