$session->login('xy', 'zzzzz');
        $a="set vrouter trust-vr";
        $b="unset protocol rip";
        $c="y";
        $f="exit";
        $d="save";
        $e="exit";
        $session->cmd($a);
        $session->cmd($b);
        $session->waitfor('/deleting RIP instance, are you sure? y\/[n] /') or die " Error getting \"deleting RIP instance, are you sure? y/[n]\" prompt: $!";
        $session->cmd($c);
        $session->cmd($f);
        $session->cmd($d);
        $session->cmd($e);
        $session->close;