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.
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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