[largescale-sig][neutron] What driver are you using?

Laurent Dumont laurentfdumont at gmail.com
Tue May 11 23:21:09 UTC 2021

I feel like it depends a lot on the scale/target usage (public vs private

But at $dayjob, we are leveraging

   - vlans for external networking (linux-bridge + OVS)
   - vxlans for internal Openstack networks.

We like the simplicity of vxlan with minimal overlay configuration. There
are some scaling/performance issues with stuff like l2 population.

VLANs are okay but it's hard to predict the next 5 years of growth.

On Mon, May 10, 2021 at 8:34 AM Arnaud Morin <arnaud.morin at gmail.com> wrote:

> Hey large-scalers,
> We had a discusion in my company (OVH) about neutron drivers.
> We are using a custom driver based on BGP for public networking, and
> another custom driver for private networking (based on vlan).
> Benefits from this are obvious:
> - we maintain the code
> - we do what we want, not more, not less
> - it fits perfectly to the network layer our company is using
> - we have full control of the networking stack
> But it also have some downsides:
> - we have to maintain the code... (rebasing, etc.)
> - we introduce bugs that are not upstream (more code, more bugs)
> - a change in code is taking longer, we have few people working on this
>   (compared to a community based)
> - this is not upstream (so not opensource)
> - we are not sharing (bad)
> So, we were wondering which drivers are used upstream in large scale
> environment (not sure a vlan driver can be used with more than 500
> hypervisors / I dont know about vxlan or any other solution).
> Is there anyone willing to share this info?
> Thanks in advance!
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