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RESOLUTION: In the Compute node, edit /etc/neutron/plugins/ml2/openvswitch_agent.ini and set the clause bridge_mappings.

[ovs]

bridge_mappings=datacentre:br-ex

And then restart the Neutron openvswitch agent on the compute node. Restart Networking services.

    # service neutron-server restart
    # service neutron-dhcp-agent restart
    # service neutron-l3-agent restart
    # service neutron-metadata-agent restart

    Also restart your chosen Networking plug-in agent, for example, Open vSwitch.

    # service neutron-openvswitch-agent restart