Hi,

Problem which You have here is that Your agent can't connect to rabbitmq. 
Because of that rpc message with report_state is timeouted and that is the 
reason of this error.
Is Your rabbitmq server on same host with ovs agent? Is rabbitmq server works 
properly?

— 
Best regards
Slawek Kaplonski
sla...@kaplonski.pl



> Wiadomość napisana przez Frank Wang <wangpeihui...@126.com> w dniu 
> 23.01.2018, o godz. 10:44:
> 
> Hi Sławomir,
>    
>      Thanks for you quick response. I'm using Ocata, Here is the exception 
> stack. 
> e: [Errno 111] ECONNREFUSED. Trying again in 14 seconds. Client port: None
> 2018-01-23 17:37:45.387 8636 ERROR oslo.messaging._drivers.impl_rabbit [-] 
> [7b611083-b03c-4aaa-bb2f-a8f6cb89ab15] AMQP server on 127.0.0.1:5672 is 
> unreachable: [Errno 111] ECONNREFUSED. Trying again in 14 seconds. Client 
> port: None
> 2018-01-23 17:37:45.395 8636 ERROR oslo.messaging._drivers.impl_rabbit [-] 
> [bc243998-c484-47b3-8a5d-59104470c441] AMQP server on 127.0.0.1:5672 is 
> unreachable: [Errno 111] ECONNREFUSED. Trying again in 14 seconds. Client 
> port: None
> 2018-01-23 17:37:45.402 8636 ERROR oslo.messaging._drivers.impl_rabbit [-] 
> [f86f1d05-6f72-443a-967e-581c9c3af656] AMQP server on 127.0.0.1:5672 is 
> unreachable: [Errno 111] ECONNREFUSED. Trying again in 14 seconds. Client 
> port: None
> 2018-01-23 17:37:51.927 8636 ERROR oslo.messaging._drivers.impl_rabbit [-] 
> [4c876705-fd92-4b32-8c45-98ff1ed75846] AMQP server on 127.0.0.1:5672 is 
> unreachable: [Errno 111] ECONNREFUSED. Trying again in 14 seconds. Client 
> port: None
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-] Failed 
> reporting state!
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback 
> (most recent call last):
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py",
>  line 312, in _report_state
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     True)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/neutron/agent/rpc.py", line 87, in 
> report_state
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     return 
> method(context, 'report_state', **kwargs)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 169, in 
> call
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     
> retry=self.retry)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 97, in 
> _send
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     
> timeout=timeout, retry=retry)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", 
> line 458, in send
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     
> retry=retry)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", 
> line 447, in _send
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     result = 
> self._waiter.wait(msg_id, timeout)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", 
> line 339, in wait
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     message = 
> self.waiters.get(msg_id, timeout=timeout)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File 
> "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", 
> line 238, in get
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     'to 
> message ID %s' % msg_id)
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent 
> MessagingTimeout: Timed out waiting for a reply to message ID 
> 5907b7ced96140c693a6fb6dd0698dbc
> 2018-01-23 17:37:53.807 8636 ERROR 
> neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent 
> 2018-01-23 17:37:53.808 8636 WARNING oslo.service.loopingcall [-] Function 
> 'neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent._report_state'
>  run outlasted interval by 30.00 sec
> 2018-01-23 17:37:59.227 8636 INFO oslo.messaging._drivers.impl_rabbit [-] 
> [3e7c487b-9222-4eee-b879-a7981649d49c] Reconnected to AMQP server on 
> 127.0.0.1:5672 via [amqp] client with port 51476.
> 2018-01-23 17:37:59.270 8636 INFO oslo.messaging._drivers.impl_rabbit [-] 
> [a6262917-f316-43df-83fd-05af30a2b302] Reconnected to AMQP server on 
> 127.0.0.1:5672 via [amqp] client with port 51478.
> 2018-01-23 17:37:59.308 8636 INFO oslo.messaging._drivers.impl_rabbit [-] 
> [99ff11c3-1662-461
> 
> Thanks,
> Frank
> At 2018-01-23 17:27:52, "Sławomir Kapłoński" <sla...@kaplonski.pl> wrote:
> >Hi,
> >
> >If both ovs agent and neutron-server reconnect to rabbitmq then it should 
> >report state properly again IMO.
> >Can You maybe send more details about Your issue? What OpenStack version You 
> >are running, exact stack trace of exception which You get and so on.
> >
> >— 
> >Best regards
> >Slawek Kaplonski
> >sla...@kaplonski.pl
> >
> >
> >
> >> Wiadomość napisana przez Frank Wang <wangpeihui...@126.com> w dniu 
> >> 23.01.2018, o godz. 10:08:
> >> 
> >> Hi All,
> >> 
> >>     I'm really newbie about OpenStack Neutron, Please correct me if I say 
> >> something wrong. There was a question I'd like to consult.  AMQP is the 
> >> messaging bus between neutron-server and *agents. we usually use rabbitmq 
> >> as the back-end of messaging bus.  The problem I encountered is the ovs 
> >> agent raise an exception while reporting its own state to the server.  
> >> Here is my guess, If I restart the controller node, what if the rabbitmq 
> >> start early than neutron-server. I mean the ovs agent always trying to 
> >> connect to the rabbitmq. It will report state to the server through RPC 
> >> once the connection established. if the server is not ready at this time. 
> >> Does it cause the agent exception?  Any suggestion would be greatly 
> >> appreciated!
> >> 
> >> 
> >> Thanks,
> >> Frank
> >> 
> >> 
> >>  
> >> __________________________________________________________________________
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> >
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> 
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