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OpenVSwitch flows missing on newly created setup

I am seeing a strange effect here in an openstack setup. i have a working installation, where i can do a "ovs-ofctl dump-flows br-int" or "br-tun", and I am seeing a lot of defined flows.

On a diferent setup, where I realized that my computing nodes can't talk to the network node. I did see a lot of ovs-ofctl commands being executed by the quantum-plugin-openvswitch-agent on these nodes where it's working, and these are completely missing from the setup where stuff is broken.

I wonder when they are created by the quantum plugin openvswitch agent, and why they exist in the first setup, but not in the second (both are using exactly the same configuration, but the order that the setup was created was different).

So what's wrong here?