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Hi Adrián, 

In my case I learnt the bad way also. And now I purchased some Intel 
pci cards and add it to servers that have not much reliable cards. 

I post my bridge config:

   Bridge "br0"
        Port "phy-br0"
            Interface "phy-br0"
        Port "br0"
            Interface "br0"
                type: internal
    Bridge br-int
        fail_mode: secure
        Port "qvob27f1522-73"
            tag: 1
            Interface "qvob27f1522-73"
        Port int-br-ex
            Interface int-br-ex
        Port br-int
            Interface br-int
                type: internal
        Port "qvo9da5cf98-f1"
            tag: 1
            Interface "qvo9da5cf98-f1"
        Port "int-br0"
            Interface "int-br0"
        Port "qvo377f7953-d2"
            tag: 1
            Interface "qvo377f7953-d2"
        Port "eth0"
            Interface "eth0"
        Port "qvod1b2e6dc-7f"
            tag: 1
            Interface "qvod1b2e6dc-7f"
    Bridge br-ex
        Port br-ex
            Interface br-ex
                type: internal
        Port phy-br-ex
            Interface phy-br-ex
    ovs_version: "2.0.2"


El dom, 14 de dic 2014 a las 10:41 , Adrián Norte Fernández 
<adrian at bashlines.com> escribió:
> 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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