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

[Tom Verdaat]

Hi Numan,

Good to know. So OVN would not fix this automatically. At least, given the
info in Darragh's gist not when used in combination with GRE/VxLAN/Geneve.

Is this on the roadmap? Somebody working on it? Is there a ticket that we
can track?

Thanks,

Tom


2017-09-08 14:37 GMT+02:00 Numan Siddique <nusiddiq at redhat.com>:

>
>
> 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/djorei
>> lly/a22ca4f38396e8867215fca0ad67fa28
>>
>>
>>
>> I don’t know about OVN and multicast.
>>
>>
>>
>> Regards,
>>
>> Darragh.
>>
>>
>>
>> *From:* ovs-discuss-bounces at openvswitch.org [mailto:
>> ovs-discuss-bounces at 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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>>
>>
>
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