$session->login('xy', 'zzzzz');
        $command1="set vrouter trust-vr";
        $command2="unset protocol rip";
        $command3="y";
        $command4="exit";
        $command5="save";
        $command6="exit";
        $session->cmd($command1) or die " Error giving \"set vrouter trust-vr\" command: $!";
        $session->cmd($command2) or die " Error giving \"unset protocol rip\" command: $!";
        $session->waitfor('/deleting RIP instance, are you sure? y\/[n]/') or die " Error getting \"deleting RIP instance, are you sure? y/[n]\" prompt: $!";
        $session->cmd($command3) or die " Error giving \"y\" command: $!";
        $session->cmd($command4) or die " Error giving \"exit\" command: $!";
        $session->cmd($command5) or die " Error giving \"save\" command: $!";
        $session->cmd($command6) or die " Error giving \"exit\" command: $!";
        $session->close;