code: def delete_os_dummy_rtr(self, tenant_id, fw_dict, is_fw_virt=False):
          
          ret = True
          tenant_name = fw_dict.get('tenant_name')
          try:
              rtr_id = fw_dict.get('router_id')
              if not rtr_id:
                  LOG.error("Invalid router id, deleting dummy interface"
                            " failed")
                  return False
              if not is_fw_virt:
                  ret = self._delete_dummy_intf_rtr(tenant_id, tenant_name,
                                                    rtr_id)
          except Exception as exc:
              # Function _attach_dummy_intf_rtr already took care of
              # cleanup for error cases.
              LOG.error("Deletion of Openstack Router failed tenant "
                        "%(tenant)s, Exception %(exc)s",
                        {'tenant': tenant_id, 'exc': str(exc)})
              ret = False
          if ret:
              res = fw_const.OS_DUMMY_RTR_DEL_SUCCESS
          else:
              res = fw_const.OS_DUMMY_RTR_DEL_FAIL
          self.update_fw_db_result(tenant_id, os_status=res)
          return ret
docs: Delete the Openstack Dummy router and store the info in DB.