[Openstack] VXLAN using OVS

Kyle Mestery (kmestery) kmestery at cisco.com
Tue Oct 22 12:42:33 UTC 2013

On Oct 22, 2013, at 2:17 AM, Romil Gupta <romilgupta19 at gmail.com> wrote:

> Hi All,
> We are using OVS as neutron plugin to use VLAN/ VXLAN. We found that OVS does multiple unicast to send the ARP request instead of sending via Multicast address. But by default Linux bridge supports Multicast.
> Is there any reason behind why OVS doesn't support Multicast?
The only reason is that support for a multicast control plane never made it upstream into OVS. However, there is effort upstream in OVS to synchronize the data plane portions of VXLAN, and when that happens, OVS VXLAN will acquire multicast support.

FYI: In Havana, you may want to checkout the ML2 plugin with the L2 Population MechanismDriver. It does some pretty neat things with regards to programming OVS using multiple tables, etc.


> Thanks in Advance :)
> Regards,
> Romil 
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