code: def _create_lacp(self, datapath, port, req):
          
          actor_system = datapath.ports[datapath.ofproto.OFPP_LOCAL].hw_addr
          res = slow.lacp(
              actor_system_priority=0xffff,
              actor_system=actor_system,
              actor_key=req.actor_key,
              actor_port_priority=0xff,
              actor_port=port,
              actor_state_activity=req.LACP_STATE_PASSIVE,
              actor_state_timeout=req.actor_state_timeout,
              actor_state_aggregation=req.actor_state_aggregation,
              actor_state_synchronization=req.actor_state_synchronization,
              actor_state_collecting=req.actor_state_collecting,
              actor_state_distributing=req.actor_state_distributing,
              actor_state_defaulted=req.LACP_STATE_OPERATIONAL_PARTNER,
              actor_state_expired=req.LACP_STATE_NOT_EXPIRED,
              partner_system_priority=req.actor_system_priority,
              partner_system=req.actor_system,
              partner_key=req.actor_key,
              partner_port_priority=req.actor_port_priority,
              partner_port=req.actor_port,
              partner_state_activity=req.actor_state_activity,
              partner_state_timeout=req.actor_state_timeout,
              partner_state_aggregation=req.actor_state_aggregation,
              partner_state_synchronization=req.actor_state_synchronization,
              partner_state_collecting=req.actor_state_collecting,
              partner_state_distributing=req.actor_state_distributing,
              partner_state_defaulted=req.actor_state_defaulted,
              partner_state_expired=req.actor_state_expired,
              collector_max_delay=0)
          self.logger.info("SW=%s PORT=%d LACP sent.",
                           dpid_to_str(datapath.id), port)
          self.logger.debug(str(res))
          return res
docs: create a LACP packet.