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.
discuss mailing list