OK so the original bug report was actually about packet loss in ovs; the
network nodes have a large number of lost tap devices tagged with 4095
segmentation id, reporting no such device in OVS.

Theory might be is is dosing the ovs-vswitchd process resulting in some
userspace datapath lossyness.

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https://bugs.launchpad.net/bugs/1749425

Title:
  Neutron integrated with OpenVSwitch drops packets and fails to
  plug/unplug interfaces from OVS on router interfaces at scale

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