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By default, a user cannot log in to the AR router. You need to run the authentication-mode command in the VTY view to set the authentication mode.
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To obtain more operation rights, run the user privilege level command in the VTY view to set the user level.
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To enable the system to disconnect a user from the VTY interface when the timeout period expires, run the idle-timeout command in the VTY view to set the timeout period.