The authentication handshake command enables the handshake with pre-connection users and authorized users.
The undo authentication handshake command disables the handshake with pre-connection users and authorized users.
By default, the handshake with pre-connection users and authorized users is enabled.
This command is available to aid upgrade compatibility. It can only be run during the configuration restoration phase of the upgrade.
After the upgrade, this command is no longer supported, and it is replaced by the authentication handshake command in the authentication profile view.