[neutron] unmanaged router resources - OVN interconnect
Roberto Bartzen Acosta
roberto.acosta at luizalabs.com
Wed Jul 12 12:03:09 UTC 2023
Hi Rodolfo,
Thanks for the feedback.
I liked the idea of having a different network type only to hold the
Transit Switches and thus the LRP but it depends on some factors like
multi-tenancy.
>From the OVN perspective, the TS is global and will only be linked to a
tenant when it is plugged into the tenant router port. My concern here is
that if Neutron manages the TS, it will need to assume the dynamic
characteristics of this TS function, ovn-ic creates and removes the TS in
NB_Global, in addition to plugging and removing ports in this switch
according to the network topology. Additionally, Neutron would still need
to handle the learned remote routes (which are listed as static routes from
the tenant router perspective).
This is an open discussion, Felix can add ideas here.
In general, it seems to me that we have no alternatives for this type of
solution other than OVN-IC (note that ovn-bgp-agent does not learn remote
routes at the SDN level / OVN).
OpenStack seems to be designed to run like a "bubble" and this traffic from
one VM to another always needs to be routed at the FIP level and external
routing layers.
Regards,
Roberto
[image: image.png]
Em qua., 12 de jul. de 2023 às 05:11, Rodolfo Alonso Hernandez <
ralonsoh at redhat.com> escreveu:
> 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 at 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 at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
>> root at 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 at 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 at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
>>
>>
>> OpenStack 2
>>
>> root at 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 at 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 at os-infra-1-neutron-ovn-northd-container-f237db97:~#
>> root at 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 at 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 at 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"]
>>
>>
>>
>>
>>
>>
>>
>> *‘Esta mensagem é direcionada apenas para os endereços constantes no
>> cabeçalho inicial. Se você não está listado nos endereços constantes no
>> cabeçalho, pedimos-lhe que desconsidere completamente o conteúdo dessa
>> mensagem e cuja cópia, encaminhamento e/ou execução das ações citadas estão
>> imediatamente anuladas e proibidas’.*
>>
>> *‘Apesar do Magazine Luiza tomar todas as precauções razoáveis para
>> assegurar que nenhum vírus esteja presente nesse e-mail, a empresa não
>> poderá aceitar a responsabilidade por quaisquer perdas ou danos causados
>> por esse e-mail ou por seus anexos’.*
>>
>
--
_‘Esta mensagem é direcionada apenas para os endereços constantes no
cabeçalho inicial. Se você não está listado nos endereços constantes no
cabeçalho, pedimos-lhe que desconsidere completamente o conteúdo dessa
mensagem e cuja cópia, encaminhamento e/ou execução das ações citadas estão
imediatamente anuladas e proibidas’._
* **‘Apesar do Magazine Luiza tomar
todas as precauções razoáveis para assegurar que nenhum vírus esteja
presente nesse e-mail, a empresa não poderá aceitar a responsabilidade por
quaisquer perdas ou danos causados por esse e-mail ou por seus anexos’.*
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