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Hi george,

the L2population Mech driver in ML2 sends forwarding informations to
the agent, so that L2 agent populates the dataplane to send traffic to
the correct tunnel. This mechanism works only in tunneling mode (GRE
or VXLAN), for the moment. With this implementation,
broadcast/Multicast is sent only in the appropriate Tunnel. This is
the partial mesh part  of the Mech driver.
For the ARP responder part, there is two implementations, one for ovs
and one for linuxbridge.
For linuxbridge, with vxlan kernel module, a vxlan port can be set
with the mode proxy, and the arp proxy is populated by L2population
mech driver as soon as a new port is added to the network backed with
VXLan. This is already in havana.
For OVS, we plan to implement arp proxy with ebtables, on the bridge
on top of the ovs switch. This part is in development. Swami is
planning to implement ARP proxy in a kernel module dedicated to
distributed routing. see the spec of
https://blueprints.launchpad.net/neutron/+spec/neutron-ovs-dvr
The migration of a VM, and the update of fdb entry is under
development too, but it should land soon. It will close this bug :
https://bugs.launchpad.net/neutron/+bug/1237841

If you are interested in ARP proxy implementation in Neutron, let's
keep in touch, ARP proxy could be a good candidate for a driver based
extension.

Mathieu

On Wed, Nov 13, 2013 at 3:49 PM, Kyle Mestery (kmestery)
<kmestery at cisco.com> wrote:
> So, there was some possible confusion around this particular item from last week.
> I've copied Mathieu Rohon here, who worked on the L2 Population items which
> affect that. He can reply in more detail, but I believe the proxy arp work is ongoing
> in Icehouse (at least for OVS), though my understanding was it should have been
> implemented for Linuxbridge in Havana.
>
> Thanks,
> Kyle
>
> On Nov 13, 2013, at 8:26 AM, George Mihaiescu <George.Mihaiescu at Q9.com> wrote:
>
>> Thanks for the slides Kyle.
>> Can you please provide some details about the proxy ARP mechanism (mentioned on slide 21) that intercepts the ARP request and answers using a pre-populated neighbour entry?
>>
>> Where is the proxy ARP learning from, and how long it caches the entries?
>> Does it update when a VM is migrated to another host?
>>
>> Thank you,
>> George
>>
>> -----Original Message-----
>> From: Kyle Mestery (kmestery) [mailto:kmestery at cisco.com]
>> Sent: Wednesday, November 13, 2013 8:59 AM
>> To: Édouard Thuleau
>> Cc: openstack at lists.openstack.org
>> Subject: Re: [Openstack] Openstack Neutron - ML2 Plugin Deep Dive.
>>
>> Yes, those are the slides, thanks for sending the links. I have also posted
>> the slides to the link sent to me by someone from the Foundation, but I'm
>> unclear as to where those slides end up. Either way, the SlideShare link
>> works and has the exact content presented by Bob and I at the Summit.
>>
>> Thanks!
>> Kyle
>>
>> On Nov 13, 2013, at 7:17 AM, Édouard Thuleau <thuleau at gmail.com> wrote:
>>
>>> This one http://fr.slideshare.net/mestery/modular-layer-2-in-openstack-neutron ?
>>>
>>> Édouard.
>>>
>>>
>>> On Wed, Nov 13, 2013 at 11:34 AM, Trinath Somanchi <trinath.somanchi at freescale.com> wrote:
>>> Hi stackers-
>>>
>>>
>>>
>>> Can anyone share the Presentation slides showcased in the Openstack Hongkong summit, on
>>>
>>> "OpenStack Neutron Modular Layer 2 Plugin Deep Dive"
>>>
>>> I have see the video, but the Presentation is not visible clear.
>>>
>>> Thank you
>>>
>>>
>>>
>>>
>>> --
>>>
>>> Trinath Somanchi - B39208
>>>
>>> trinath.somanchi at freescale.com | extn: 4048
>>>
>>>
>>>
>>>
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>>
>>
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>