[ovs-discuss] Tenant multicast traffic on OpenStack with OVN

Numan Siddique nusiddiq at redhat.com
Fri Sep 8 12:37:51 UTC 2017


On Fri, Sep 8, 2017 at 4:36 PM, O'Reilly, Darragh <darragh.oreilly at hpe.com>
wrote:

> Hi Tom,
>
>
>
> I can confirm that multicast works very well with Neutron ML2/OVS provider
> networks. See https://gist.github.com/djoreilly/
> a22ca4f38396e8867215fca0ad67fa28
>
>
>
> I don’t know about OVN and multicast.
>
>
>
> Regards,
>
> Darragh.
>
>
>
> *From:* ovs-discuss-bounces at openvswitch.org [mailto:ovs-discuss-bounces@
> openvswitch.org] *On Behalf Of *Tom Verdaat
> *Sent:* 08 September 2017 10:26
> *To:* ovs-discuss at openvswitch.org
> *Subject:* [ovs-discuss] Tenant multicast traffic on OpenStack with OVN
>
>
>
> Hi all,
>
> I've been looking into how we can enable multicast traffic for our
> OpenStack tenants. We once had this on an old OpenStack release that was
> using nova-networking and a flat network, but lost this when moving to a
> Neutron provider networking setup. Apparently - according to Cisco - it
> doesn't work with a regular Neutron ML2 + OVS setup due to what the neutron
> L3 agent does with namespaces and iptables.
>
> In reply to an audience questions about it during the Boston OpenStack
> Summit talk on OVN somebody mentioned that OVS can handle multicast traffic
> just fine and that this means using OVN it could, potentially, also work
> for tenants. So with the new OpenStack Pike release, OVN active/passive HA
> support making it suitable for production and OVN doing away with all the
> Neutron agents (including the L3 agent?) things are looking up. Just
> wondering if anyone could tell me:
>
> Would multicast work when using Neutron with OVN?
>
>
>
> If so, would it work with provider networks, flat networking, or both?
>
>
>
> Any insights into the state of multicast supoprt is greatly appreciated!
>
>
>
> Thanks,
>
> Tom
>


Hi Tom,

OVN would treat multicast traffic as broadcast traffic. Although I have not
tested this.
Presently OVN doesn't support IGMP snooping.

Thanks
Numan


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