On Fri, Jun 26, 2020 at 10:10:47AM +0000, Loschwitz,Martin Gerhard wrote:
> Folks,
> 
> I’m contacting you to find out if a behaviour I see is expected behaviour or 
> actual misdemeanour in Open vSwitch and/or OVN. I have an OpenStack setup 
> here that uses OVN. I have configured several VLAN-based provider networks. 
> What I want to do is use a GRE-tunnel *inside* one of these VLAN networks. On 
> the target compute node, I see that traffic enters the physical host but is 
> not forwarded to the bridge to which the VM is connected. I can see that the 
> flows for that are missing in the flow table.
> 
> I fully understand that OVN supports Geneve only, but in this case, I want my 
> *tenants* to be able to use GRE encapsulation in a provider network. Is this 
> supposed to work and this is either a bug or a misconfiguration? And if it is 
> not expected to work, what are possible alternatives?

I'm surprised this doesn't work.  I'd expect it to work.  At a guess,
I'd suspect MTU issues, especially if you see that it sometimes works
for connection setup.
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