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I had a similar problem because a cheap realtek card.

Do you have logs? Can you post the result of ovs-vsctl show command on
compute node?
El 14/12/2014 22:36, "Gonzalo Aguilar Delgado" <gaguilar at aguilardelgado.com>
escribió:

> Hi Adrian,
>
> It's ubuntu trusty and network cards are intel, broadcom and marvell
>
> Marvell Technology Group Ltd. 88SE912x
> Broadcom Corporation NetXtreme II BCM5706 Gigabit Ethernet
> Intel Corporation 82574L Gigabit Network
>
> But I don't think it's the problem. It seems more a problem on config or
> maybe a bug, since it doesn't fail on any other circumstances. And I'm
> running ceph! It needs reliable network.
>
> What are you looking at?
>
>
> El dom, 14 de dic 2014 a las 9:11 , Adrián Norte Fernández <
> adrian at bashlines.com> escribió:
>
> Which SO and network cards are you using?
> El 14/12/2014 19:35, "Gonzalo Aguilar Delgado" <
> gaguilar at aguilardelgado.com> escribió:
>
>> Hi all,
>>
>> Question is. Why I have to restart neutron-plugin-openvswitch-agent to
>> recover networking from new machines?
>>
>>
>> I found a problem creating machines in a new node I've built. And
>> realized that this happens on all my nodes of current version.
>>
>> neutron 2.3.4
>> nova      2.17.0
>>
>> My logs shows that neutron assign vlan 2 for the new machine and this
>> causes the machine to not have connectivity.
>>
>> ---------------------------------------
>> 2014-12-14 17:57:07.321 12501 INFO
>> neutron.plugins.openvswitch.agent.ovs_neutron_agent [-] Assigning 2 as
>> local vlan for net-id=727b0415-f066-40d9-8147-183e07dd7b23
>> 20
>> ---------------------------------------
>>
>>
>> If I shut down the machine and restart neutron plugin agent for ovs:
>>
>> #> restart neutron-plugin-openvswitch-agent
>>
>>
>> ---------------------------------------
>>  ...  assigning 1 as local vlan for
>> net-id=727b0415-f066-40d9-8147-183e07dd7b23
>>
>> ---------------------------------------
>>
>>
>> And the machine recovers connectivity.
>>
>> In the even of faillure (after creating it):
>>
>> If I start the machine without ip and set it manually I can try to ping
>> it. It says it's not reachable but after restating the plugin automatically
>> recovers connectivity. So no restart or further configuration is made.
>>
>>
>> Maybe I have something wrong configured but it seems like a bug.
>>
>>
>> Can someone point me to the right place?
>>
>>
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