Neutron/OVN + IPv6

Lajos Katona katonalala at
Thu Jun 23 07:23:21 UTC 2022

For OVN BGP there was a presentation in Berlin:

Lajos (lajoskatona)

Dmitriy Rabotyagov <noonedeadpunk at> ezt írta (időpont: 2022. jún.
22., Sze, 7:55):

> Hi,
> As far as I know there's ongoing work to support BGP with OVN. I'm not
> sure if it's production ready (bet it's not), but you can totally try it
> out:
> вт, 21 июн. 2022 г., 22:48 Tiago Pires <tiagohp at>:
>> Hi Tim,
>> From the border routers to the Internet, it is not a problem to summarize
>> the /64 in /48 for example.
>> My point is how to know the next-hop neutron router's IP that has a
>> subnet /64 behind it? When you have many routers, we need a dynamic
>> mechanism for it.
>> I think the neutron ML2/OVN gap is to not support IPv6 Prefix delegation
>> that would be the better solution for it.
>> And Neutron BGP dynamic with OVN is not supported as I could check in the
>> documentation.
>> So, I don't know if there is another way to use IPv6 using the
>> integration with Neutron and OVN.
>> Regards,
>> Tiago Pires
>> Em ter., 21 de jun. de 2022 às 15:35, < at>
>> escreveu:
>>> I think that you’d normally advertise much larger subnets than /64 and
>>> then subnet those for different domains. Routing in ipv6 should be much
>>> more straightforward as there should be no NAT, which ought to make it much
>>> easier to work out what’s talking to what.
>>> On 21 Jun 2022, at 18:21, Tiago Pires <tiagohp at> wrote:
>>> Hi all,
>>> I am trying to figure out how to enable workloads on overlay to use IPv6
>>> addresses and communicate with external networks.
>>> I have to use Neutron ML2/OVN in my scenario and I have doubts regarding
>>> how the external networks(Internet) can know how to reach the VMs using
>>> IPv6 address behind a regular neutron router.
>>> I was checking this link
>>> that uses the BGP speaker on neutron in order to advertise the /64 subnets
>>> to a border router, that option should work fine but Neutron/BGP Speaker is
>>> not supported with OVN as I could check on the documentation.
>>> How are you using IPv6 integration (Neutron/OVN) to advertise the /64
>>> subnets?
>>> Tiago Pires
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the openstack-discuss mailing list