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13.1 VTY shell username

Command: username username nopassword

With this set, user foo does not need password authentication for user vtysh. With PAM vtysh uses PAM authentication mechanism.

If vtysh is compiled without PAM authentication, every user can use vtysh without authentication. vtysh requires read/write permission to the various daemons vty sockets, this can be accomplished through use of unix groups and the –enable-vty-group configure option.