Hello Roberto:

We talked about this possible RFE during the PTG [1] but I don't remember having any proposal. Actually what I remember (and was written in the etherpad) is that you were going to present an RFE. Can you explain it briefly?

We also talked about the idea, proposed by Felix in the mailing list, of having a different network type only to hold the Transit Switches and thus the LRP. If you have a proposal, please present it.

Regards.

[1]https://etherpad.opendev.org/p/neutron-bobcat-ptg#L506

On Tue, Jul 11, 2023 at 10:50 PM Roberto Bartzen Acosta <roberto.acosta@luizalabs.com> wrote:
Hello Neutron folks,

Regarding the conversation started in March [1] about the use of OVN interconnect with Neutron, I would like to evolve the discussion in relation to resources allocated by OVN-IC and which are not managed by Neutron. In the March PTG [2], the problem related to the db_sync tool was presented, and a proposed solution in which Neutron does not manage these resources.

After discussing some architectural designs with Felix/StackIT, it seems to make sense to come up with a proposal to change the mech_driver to validate the external_ids key and not remove resources present in the OVN backend without Neutron "signature".

The discussion here is more complex than it seems, because architecturally Neutron does not allow us to interconnect workloads in multiple AZs (with different OpenStacks), but this could be a requirement for a high availability cloud solution (Cloud Region). Additionally, this OVN-IC solution allows interconnecting other cloud backends that use OVN, in the case of kubernetes with ovn-kube.

We tested an OVN interconnect integrated with 3 OpenStack installations and it worked very well !!! considering direct L3 traffic at the router level between different network infrastructures.

SYNC_REPAIR - problem

* Static Routes (learned OVN-IC routes)
* Router Port -> Transit Switches

Jul 10 18:34:11 os-infra-1-neutron-server-container-845157ae neutron-server[8632]: 2023-07-10 18:34:11.343 8632 WARNING neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync [req-8d513732-f932-47b8-bc2c-937958c30f47 - - - - -] Router Port found in OVN but not in Neutron, port_id=rt2-admin-tenant1
Jul 10 18:34:11 os-infra-1-neutron-server-container-845157ae neutron-server[8632]: 2023-07-10 18:34:11.343 8632 WARNING neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync [req-8d513732-f932-47b8-bc2c-937958c30f47 - - - - -] Router 9823d34b-bb2a-480c-b3f6-cf51fd19db52 static routes [{'destination': '10.0.0.1/24', 'nexthop': '169.254.100.1'}, {'destination': '10.0.2.1/24', 'nexthop': '169.254.100.3'}] found in OVN but not in Neutron


Any suggestions on how to resolve this db_sync issue? since all other Neutron modules did not present any problem with OVN-IC (as far as I tested).
I remember Terry was keen to suggest some things to help. I believe that before proposing some complex mechanism to solve this simple problem, I would like to hear the community opinion. In our use case, a bit change in db_sync with filter by neutron key in external_ids would be enough.

Regards,
Roberto



[1] https://lists.openstack.org/pipermail/openstack-discuss/2023-March/032624.html
[2] https://etherpad.opendev.org/p/neutron-bobcat-ptg



Additional logs:

OpenStack 1

root@os-infra-1-neutron-ovn-northd-container-f931b37c:~#
root@os-infra-1-neutron-ovn-northd-container-f931b37c:~#
root@os-infra-1-neutron-ovn-northd-container-f931b37c:~# ovn-nbctl lr-route-list 6b776115-746a-4c59-aa73-6674c70b3498
IPv4 Routes
Route Table <main>:
              20.0.1.0/24             169.254.200.2 dst-ip (learned)
              20.0.2.0/24             169.254.200.3 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip
root@os-infra-1-neutron-ovn-northd-container-f931b37c:~# ovn-nbctl lr-route-list 23d4552a-62c4-40e1-8bae-d06af3489c07
IPv4 Routes
Route Table <main>:
              10.0.1.0/24             169.254.100.2 dst-ip (learned)
              10.0.2.0/24             169.254.100.3 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip
root@os-infra-1-neutron-ovn-northd-container-f931b37c:~#


OpenStack 2

root@os-infra-1-neutron-ovn-northd-container-30f7e935:~# ovn-nbctl lr-route-list dc1e5008-adb9-451e-8b71-09388f3680bc
IPv4 Routes
Route Table <main>:
              20.0.0.0/24             169.254.200.1 dst-ip (learned)
              20.0.2.0/24             169.254.200.3 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip
root@os-infra-1-neutron-ovn-northd-container-30f7e935:~# ovn-nbctl lr-route-list ce45f681-6454-43fe-974f-81344bb8113a
IPv4 Routes
Route Table <main>:
              10.0.0.0/24             169.254.100.1 dst-ip (learned)
              10.0.2.0/24             169.254.100.3 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip



OpenStack 3

root@os-infra-1-neutron-ovn-northd-container-f237db97:~#
root@os-infra-1-neutron-ovn-northd-container-f237db97:~# ovn-nbctl lr-route-list  cfa259d6-311f-4409-bcf2-79a929835cb3
IPv4 Routes
Route Table <main>:
              20.0.0.0/24             169.254.200.1 dst-ip (learned)
              20.0.1.0/24             169.254.200.2 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip
root@os-infra-1-neutron-ovn-northd-container-f237db97:~# ovn-nbctl lr-route-list  c5a4dcd8-b9a6-4397-a7cf-88bc1e01b0b0
IPv4 Routes
Route Table <main>:
              10.0.0.0/24             169.254.100.1 dst-ip (learned)
              10.0.1.0/24             169.254.100.2 dst-ip (learned)
                0.0.0.0/0             200.200.200.1 dst-ip

IPv6 Routes
Route Table <main>:
                     ::/0     fc00:ca5a:ca5a:8000:: dst-ip


OVN-IC Global database

root@ovn-global-db1:~# ovn-ic-sbctl show
availability-zone osp1
    gateway 832b6c0d-13ce-4600-ab37-78516d8ec4c5
        hostname: osp1-gwnode1
        type: geneve
            ip: 192.168.200.28
        port admin-rt1-tenant1
            transit switch: admin-tenant1
            address: ["aa:aa:aa:aa:bb:01 169.254.100.1/24 fe80::1/64"]
        port admin-rt1-tenant1_1
            transit switch: admin-tenant1_1
            address: ["aa:aa:aa:aa:dd:01 169.254.200.1/24"]
availability-zone osp2
    gateway 17ffabdf-cf47-41ab-9539-d326c13c4ca8
        hostname: osp2-gwnode1
        type: geneve
            ip: 192.168.200.128
        port admin-rt2-tenant1
            transit switch: admin-tenant1
            address: ["aa:aa:aa:aa:bb:02 169.254.100.2/24 fe80::2/64"]
        port admin-rt2-tenant1_1
            transit switch: admin-tenant1_1
            address: ["aa:aa:aa:aa:dd:02 169.254.200.2/24"]
availability-zone osp3
    gateway 97595af9-7896-40d0-a883-beadbff1aa5b
        hostname: osp3-gwnode1
        type: geneve
            ip: 192.168.200.228
        port admin-rt3-tenant1
            transit switch: admin-tenant1
            address: ["aa:aa:aa:aa:aa:03 169.254.100.3/24 fe80::3/64"]
        port admin-rt3-tenant1_1
            transit switch: admin-tenant1_1
            address: ["aa:aa:aa:aa:dd:03 169.254.200.3/24"]







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