On Fri, May 23, 2025 at 03:56:18PM -0300, Tiago Pires via discuss wrote:
> Hi, Felix
>
> On Fri, May 23, 2025 at 8:51 AM Tiago Pires <tiago.pi...@luizalabs.com> wrote:
> >
> > Hi, Felix
> >
> > On Thu, May 22, 2025 at 4:07 AM Felix Huettner
> > <felix.huettner@stackit.cloud> wrote:
> > >
> > > On Wed, May 21, 2025 at 02:38:46PM -0300, Tiago Pires via discuss wrote:
> > > > Hi all,
> > > >
> > > > I'm testing the OVN BGP support in OVN IC scenario where there a few
> > > > AZs and one of them is where I have BGP support to learn external
> > > > routes and advertise overlay internal subnets.
> > > >
> > > > Following is a logical router in the AZ that has the BGP support and
> > > > it is learning the IC routes from other AZs:
> > > > # ovn-nbctl lr-route-list r1
> > > > IPv4 Routes
> > > > Route Table <main>:
> > > > 192.168.10.0/24 169.254.11.1 dst-ip (learned)
> > > > 192.168.20.0/24 169.254.11.2 dst-ip (learned)
> > > > 192.168.30.0/24 169.254.11.3 dst-ip (learned)
> > > >
> > > >
> > > > I can see the advertised routes to my external BGP speaker:
> > > >
> > > > # ovn-sbctl list Advertised_Route
> > > > _uuid : 8f3f435d-dc3b-4926-a2d2-0acd6266f071
> > > > datapath : e632a5c1-d1ce-4f51-a2df-64d891cf43c9
> > > > external_ids : {}
> > > > ip_prefix : "192.168.10.0/24"
> > > > logical_port : b4a6588a-df77-4a3e-9de7-008028e254f1
> > > > tracked_port : []
> > > >
> > > > _uuid : 21cb1532-24f8-4fa5-ad90-8f922f85a315
> > > > datapath : e632a5c1-d1ce-4f51-a2df-64d891cf43c9
> > > > external_ids : {}
> > > > ip_prefix : "192.168.20.0/24"
> > > > logical_port : b4a6588a-df77-4a3e-9de7-008028e254f1
> > > > tracked_port : []
> > > >
> > > > _uuid : 70fad70a-c2f7-47d7-b3ea-def4bb521113
> > > > datapath : e632a5c1-d1ce-4f51-a2df-64d891cf43c9
> > > > external_ids : {}
> > > > ip_prefix : "192.168.30.0/24"
> > > > logical_port : b4a6588a-df77-4a3e-9de7-008028e254f1
> > > > tracked_port : []
> > > >
> > > >
> > > > And also the learned routes from the BGP speaker:
> > > >
> > > > # ovn-sbctl list Learned_Route
> > > > _uuid : ad1a2f94-e027-4ad8-878c-839edcb12624
> > > > datapath : e632a5c1-d1ce-4f51-a2df-64d891cf43c9
> > > > external_ids : {}
> > > > ip_prefix : "10.0.0.0/24"
> > > > logical_port : b4a6588a-df77-4a3e-9de7-008028e254f1
> > > > nexthop : "169.254.1.1"
> > > >
> > > >
> > > > The above route is not installed into the logical router routing table:
> > > >
> > > > # ovn-nbctl lr-route-list r1
> > > > IPv4 Routes
> > > > Route Table <main>:
> > > > 192.168.10.0/24 169.254.11.1 dst-ip (learned)
> > > > 192.168.20.0/24 169.254.11.2 dst-ip (learned)
> > > > 192.168.30.0/24 169.254.11.3 dst-ip (learned)
> > >
> > > Hi Tiago,
> > >
> > > the BGP route learning is only happening between southbound and northd.
> > > They are not reflected in northbound.
> > > That means you will not see it in lr-route-list.
> > > You can see if they are installed by taking a look at the lflow-list of
> > > r1.
Hi Tiago,
> >
> > Yes, I can see the SB logical flows related with the learned routes
> > but it is learned by ovn-ic.
> Correcting myself, I mean ovn-ic does not learn the routes.
>
> Regards,
> Tiago Pires
> > So, it seems for ovn-ic in order to learn those routes it would need
> > to be synced with northbound, that is right? If that assumption is
> > true, we are going to propose some implementation for that.
that was also discussed back during the implementation. We decided to
not sync to northbound as the CMS might assume it has full control over
the contents there. So at least creating Logical_Router_Static_Route
records would probably be problematic.
Maybe syncing to something else is better, but i am unsure about that.
However ovn-ic already connects to the southbound, right? So it could
maybe just directly ready the data from there.
Thanks,
Felix
> >
> > Regards,
> >
> > Tiago Pires
> >
> > >
> > > Thanks,
> > > Felix
> > >
> > > >
> > > > Should the learned route be installed in the logical router routing
> > > > table? I'm trying to understand if I'm missing some step or the
> > > > current implementation can not handle it yet.
> > > > My goal is to see the external route installed in the logical router
> > > > routing table and be learned via OVN IC by the other AZs.
> > > >
> > > > Regards,
> > > >
> > > > Tiago Pires
> > > >
> > > > --
> > > >
> > > >
> > > >
> > > >
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> > > >
> > > >
> > > >
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>
> --
>
>
>
>
> _‘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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