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