code: def set_chassis(self, chassis):
          
  
          yield from self._hypervisor.send('c1700 set_chassis "{name}" {chassis}'.format(name=self._name, chassis=chassis))
  
          log.info('Router "{name}" [{id}]: chassis set to {chassis}'.format(name=self._name,
                                                                             id=self._id,
                                                                             chassis=chassis))
  
          self._chassis = chassis
          self._setup_chassis()
docs: Sets the chassis.
  
          :param: chassis string:
          1720, 1721, 1750, 1751 or 1760