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Hi Roberto,

We will face a similar issue in the future and have also looked at ovn-interconnect (but not yet tested it).
There is also ovn-bgp-agent [1] which has an evpn mode that might be relevant.

Whatever you find I would definitely be interested in your results

[1] https://opendev.org/x/ovn-bgp-agent

--
Felix Huettner

From: Roberto Bartzen Acosta <roberto.acosta at luizalabs.com>
Sent: Wednesday, March 8, 2023 9:49 PM
To: openstack-discuss at lists.openstack.org
Cc: Tiago Pires <tiago.pires at luizalabs.com>
Subject: [neutron] Openstack Network Interconnection

Hey folks.

Does anyone have ideas on how to interconnect different Openstack deployments?
Consider that we have multiple Datacenters and need to interconnect tenant networks. How could this be done in the context of OpenStack (without using VPN) ?

We have some ideas about the usage of OVN-IC (OVN Interconnect). It looks like a great solution to create a network layer between DCs/AZs with the help of the OVN driver. However, Neutron does not support the Transit Switches (OVN-IC design) that are required for this application.

We've seen references to abandoned projects like [1] [2] [3].

Does anyone use something similar in production or have an idea about how to do it? Imagine that we need to put workloads on two different AZs that run different Openstack installations, and we want to communicate with the local networks without using a FIP.
I believe that the most coherent way to maintain databases consistent in each Openstack would be an integration with Neutron, but I haven't seen any movement on that.

Regards,
Roberto

[1] https://www.youtube.com/watch?v=GizLmSiH1Q0<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DGizLmSiH1Q0&data=05%7C01%7C%7C7c899166e1ec438b1f7908db20182331%7Cd04f47175a6e4b98b3f96918e0385f4c%7C0%7C0%7C638139060268571269%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=NdmjPTTQd9HisMRNF8yim%2BjOeXZrlqVY6Q4tKTpb%2FPo%3D&reserved=0>
[2] https://specs.openstack.org/openstack/neutron-specs/specs/stein/neutron-interconnection.html<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fspecs.openstack.org%2Fopenstack%2Fneutron-specs%2Fspecs%2Fstein%2Fneutron-interconnection.html&data=05%7C01%7C%7C7c899166e1ec438b1f7908db20182331%7Cd04f47175a6e4b98b3f96918e0385f4c%7C0%7C0%7C638139060268571269%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=MSh%2BPpWY6L1UoA5kE21cn5khtFWgq%2F8J00kWdOLmHCI%3D&reserved=0>
[3] https://opendev.org/x/neutron-interconnection<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fopendev.org%2Fx%2Fneutron-interconnection&data=05%7C01%7C%7C7c899166e1ec438b1f7908db20182331%7Cd04f47175a6e4b98b3f96918e0385f4c%7C0%7C0%7C638139060268571269%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=pb%2B85Y2eobtcu7HbcZpdN68qNjmd2WuedSLteQ3cli8%3D&reserved=0>


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