[nova] Request to include routed networks support in the Ussuri cucly goals

Sean McGinnis sean.mcginnis at gmx.com
Mon Oct 7 20:19:22 UTC 2019

On Mon, Oct 07, 2019 at 01:02:32PM -0500, Miguel Lavalle wrote:
> Hi Stackers,
> I want to request the inclusion of the support for Neutron Routed Networks
> in the Nova goals for the Ussuri cycle. As many of you might know, Routed
> networks is a feature in Neutron that enables the creation of very large
> virtual networks that avoids the performance penalties of large L2
> broadcast domains (
> https://www.openstack.org/videos/summits/barcelona-2016/scaling-up-openstack-networking-with-routed-networks).
> This functionality can be very helpful for large deployers who have the
> need to have one or a few large virtual networks shared by all their users
> and has been available in Neutron since very soon after the Barcelona
> Summit in 2016. But it is really useless until there is code in Nova that
> can schedule VMs to compute hosts based on the segments topology of the
> routed networks. Without it, VMs can land in compute hosts where their
> traffic cannot be routed by the underlying network infrastructure. I would
> like the Nova team to consider the following when making a decision about
> this request:

Is there a community-wide effort with this, or is this really just asking that
Nova prioritize this work?

The cycle goals (typically) have been used for things that we need the majority
of the community to focus on in order to complete. If this is just something
between Neutron and Nova, I don't think it really fits as a cycle goal.

I do think it would be a good thing to try to complete in Ussuri though. Just
maybe not as a community goal.


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