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Have you found the root cause? or workaround? I got similar logs. I have only 2 nodes, so I installed controller and network node on the single node, compute is another node.

I can see the gre port on COMPUTE node, but on controller (as well as network node) can not see gre port.

similar logs: 2015-04-22 15:55:30.428 15064 WARNING neutron.plugins.ml2.drivers.type_gre [req-903f1aab-693c-49b4-8fd8-1b954445adcf None] Gre endpoint with ip 10.1.1.5 already exists