The setup is a machine running VPP 19.01, configured using NAT44, with two physical interfaces. One interface is inside, other one is outside. The unit was translating and passing traffic just fine, and then all of a sudden stopped passing anything through the outside interface. Any packet which hits it is immediately counted as a Congestion Drop.
Doing a packet trace shows that the packet is sent to the worker handoff, then Congestion Drop increases. There is hardly any traffic passing through it right now, but any packet which does hit is dropped due to congestion.
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