>>> + @handler.set_ev_cls(ofp_event.EventOFPPortStatus,
>>> handler.MAIN_DISPATCHER)
>>> + def port_status_handler(self, ev):
>>> + msg = ev.msg
>>> + reason = msg.reason
>>> + dpid = msg.datapath.id
>>> + port_no = msg.desc.port_no
>>> + ofproto = msg.datapath.ofproto
>>> +
>>> + if reason == ofproto.OFPPR_ADD:
>>> + LOG.debug('port was added.' +
>>> + '(datapath id = %s, port number = %s)',
>>> + dpid, port_no)
>>> + self._add_port(dpid, port_no)
>>> + self.send_event_to_observers(EventDPPortAdd(dpid, port_no))
>>> +
>>> + elif reason == ofproto.OFPPR_DELETE:
>>> + LOG.debug('port was deleted.' +
>>> + '(datapath id = %s, port number = %s)',
>>> + dpid, port_no)
>>> + self._del_port(dpid, port_no)
>>> + self.send_event_to_observers(EventDPPortDelete(dpid, port_no))
>>> +
>>> + else:
>>> + assert reason == ofproto.OFPPR_MODIFY
>>> + LOG.debug('port was modified.' +
>>> + '(datapath id = %s, port number = %s)',
>>> + dpid, port_no)
>>> + self.send_event_to_observers(EventDPPortModify(dpid, port_no))
>>
>> Doesn't this track port state like link up/down.
>>
> OK, I'll try to track modify state.
> Has OFPPR_MODIFY some parameters?
> In dpset.py, PortState.add and PortState.modify are same code.
>
I have understood that PortState, in dpset.py, has all property of port.
I'll use PortState class.
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