[ovs-dev] OVN - L3 Gap between NB schema and Neutron

Russell Bryant rbryant at redhat.com
Mon Aug 3 14:34:20 UTC 2015

On 08/03/2015 03:36 AM, Amitabha Biswas wrote:
> Hi,
> I think Gal is saying the following - ml2 allows the following:
> VM ( --- Logical_Switch ---- ( LogicalRouter
>                               |                 |
>                               |                 |
> VM ( ----+                +-----( LogicalRouter
> The Logical Switch (OVN_NB) has a one to one mapping to a Logical Datapath 
> (OVN_SB).
> An alternate schema could be to map Subnets to a Logical Switch instead of 
> mapping a Neutron Network to a Logical Switch. This would preserve the 
> requirement of a single router port in the Logical Switch table.

I don't think we'd be implementing the Neutron API properly at that
point.  It's my understanding that a Neutron network is supposed to be a
single L2 domain.

I wonder if the above is ever actually used in practice, even if
technically possible.  Is there a reason someone would prefer the above
example topology instead of putting each subnet on its own network?

Russell Bryant

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