code: def hwvtep_add_rbridgeid(self, **kwargs):
          
          name = kwargs.pop('name')
          id = kwargs.pop('rb_range')
          ip_args = dict(name=name, rb_add=id)
          method_name = 'overlay_gateway_attach_rbridge_id_rb_add'
          method_class = self._brocade_tunnels
          gw_attr = getattr(method_class, method_name)
          config = gw_attr(**ip_args)
          output = self._callback(config)
          return output
docs: Add a range of rbridge-ids
  
          Args:
              name  (str): gateway-name
              vlan (str): rbridge-ids range
              callback (function): A function executed upon completion of the
                   method.
  
          Returns:
             Return value of `callback`.
  
          Raises:
              None