async def METHOD_NAME(self, chassis):
    """
    Sets the chassis.
    :param: chassis string:
    1720, 1721, 1750, 1751 or 1760
    """
    await 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()