<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def rollback(self, label, plane):
 """Rollback config."""

        cm_label = 'condoor-{}'.format(int(time.time()))
        self.device.send(self.rollback_cmd.format(label), timeout=120)
        return cm_label