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Hello, I just had this issue. I was focusing on the warning as well. As someone else stated, the warning isnt a concern. The real error appears to be:

2014-05-04 16:57:08.929 1968 ERROR nova.compute.manager [req-d1b25428-d1ff-4061-9c74-b781738b75fb 6404404b3fb34591bd72be8788bb1c7e b96454f1425b4a159da8daad18a438de] [instance: a4463cd9-489b-4f96-b68a-d48462d83fe9] Error: Unexpected vif_type=binding_failed

This issue appeared after running updates today. My /etc/init.d/neutron-openvswitch-agent was clobbered. Give this a try: Ensure symbolic link is in place:

ln -s plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

Fix init script

cp /etc/init.d/neutron-openvswitch-agent /etc/init.d/neutron-openvswitch-agent.orig
sed -i 's,plugins/openvswitch/ovs_neutron_plugin.ini,plugin.ini,g' /etc/init.d/neutron-openvswitch-agent

Then restart nova and openvswitch agent.