Install the OVS agent:
apt-get -y install quantum-plugin-openvswitch-agent
The ovs_quantum_plugin.ini created in the above step must be replicated on all nodes quantum-plugin-openvswitch-agent. When using tunneling, each node running quantum-plugin-openvswitch agent should have an IP address configured on the Data Network, and that IP address should be specified using the local_ip value in the ovs_quantum_plugin.ini file.
Then restart the agent
service quantum-plugin-openvswitch-agent restart
All hosts running quantum-plugin-openvswitch-agent also requires that an OVS bridge named "br-int" exists. To create it, run:
ovs-vsctl add-br br-int