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I had this error message, when I had configured /etc/neutron/plugins/ml2/linuxbridge_agent.ini wrong.

I had put physical_interface_mappings = provider:eth1 into the DEFAULT-Section and that was wrong.

Putting physical_interface_mappings = provider:eth1 into the linux_bridge section solved this issue for me.

I recommend to check /etc/neutron/plugins/ml2/linuxbridge_agent.ini on the controller and compute nodes and I would also check the interfaces configuration for controller and compute nodes. Here is an example of my configuration:

auto eth1

iface eth1 inet manual

up ip link set dev $IFACE up

down ip link set dev $IFACE down