[ovs-discuss] OVN Dynamic Routing

Daniel Alvarez Sanchez dalvarez at redhat.com
Thu Jan 7 12:17:12 UTC 2021

Thanks Ankur, all for the presentation and slides.

If I may, I have a some questions regarding the proposed solution:

1) Who is responsible for creating the VTEP endpoints on each hypervisor?
Are they assumed to be created in advance or somehow this solution will
take care of it? If the latter, how will it work and how will 'ovn-routing'
know the addresses of the endpoints? OVN VTEP gateways?

2) In the diagram at [0], what's the 'MAC ROUTER'? Is this OVN Logical
Router connected to a Logical Switch with a localnet port and this MAC
address corresponds to such port in the router? Or it would be the MAC
address of ''. What if two VMs in the same LS reside on different
hypervisors, would you still advertise the same MAC but use a different VNI?
With OVN routers being distributed we'd have the same MAC address
advertised on multiple HVs and we need to use different VNIs to distinguish
them, right?

3) If two OVN VMs want to reach each other, it will still use the Geneve
overlay right? This whole solution is mainly for incoming traffic or I'm
missing something?

I'm sorry if the questions are a bit blurry but I guess that after
reviewing the slides and recording I didn't quite grasp it :)

Thanks a lot in advance!

[0] https://youtu.be/9DL8M1d4xLY?t=330

On Mon, Dec 14, 2020 at 8:25 PM Ankur Sharma <ankur.sharma at nutanix.com>

> Hi Frode,
> Glad to see your message.
> Yes, while we started with EVPN as our main use case, we agree that it is
> more of a generic dynamic routing capability in OVN.
> Sure, we will kickstart the discussions around this on mailing list as
> well.
> Thanks
> Regards,
> Ankur
> ------------------------------
> *From:* Frode Nordahl <frode.nordahl at canonical.com>
> *Sent:* Thursday, December 10, 2020 1:10 AM
> *To:* Ankur Sharma <ankur.sharma at nutanix.com>
> *Cc:* Greg Smith <greg at nutanix.com>; ovs-discuss <
> ovs-discuss at openvswitch.org>
> *Subject:* OVN Dynamic Routing
> Hello, Ankur, Greg, All,
> Thank you for sharing your view on dynamic routing support for OVN
> during OVSCON 2020 [0].
> I believe this is a topic that interests multiple parties in the
> community, and it applies to multiple topologies/use cases, not just
> Would you be interested in presenting and discussing the proposed
> design on the mailing list?
> 0:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.openvswitch.org_support_ovscon2020_&d=DwIBaQ&c=s883GpUCOChKOHiocYtGcg&r=mZwX9gFQgeJHzTg-68aCJgsODyUEVsHGFOfL90J6MJY&m=3HUT7aQXAsSImmITSraoqdZ6mWcRxUtwVRKAfH3ygQA&s=Xzze2S3f7Rstp66gRz7MSuTGvGltr3t8uxyx5M3R8og&e=
> --
> Frode Nordahl
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