Can you take snapshots of flows in the kernel at different moments in time 
(when everything is OK and it is not) using the dpctl utility (ovs-dpctl) ?

> On Oct 14, 2016, at 12:11 PM, Valentine Sinitsyn 
> <> wrote:
> Hi everyone,
> We are observing strange OVS behavior in some of our setups.
> Sometimes, the traffic just stops flowing through veth or tap interfaces 
> plugged into OVS bridge.
> ovs-appctl ofproto/trace for sample packet show that OVS will output it to 
> the correct port, and we see real traffic in a mirror port we add to OVS.
> This persists until one re-initializes the interface with ip link set down && 
> ip link set up. Then the traffic flow restores. Nothing changes in OF flows 
> as per ovs-ofctl dump-flows, except cookie value, which I presume means OVS 
> re-installed the flows. The OVS database remains the same as well, except 
> stats.
> How can we debug this? I'm giving a high-level overview without any details 
> as I'm not seeking for the solution, just a way to find one. I'm okay with 
> OVS internals and diving into the kernel.
> Many thanks,
> Valentine Sinitsyn
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