[queens] [neutron]security_groups_log]

Hello, I have queens installation based on centos7. Before implementing security groups logs, I had the following configuration in /etc/neutron/plugins/ml2/openvswitch_agent.ini: firewall_driver = iptables_hybrid Enabling security groups log I had to change it in : firewall_driver = openvswitch It seems to work end security logs are logged . After restarting kvm nodes and controllers, virtual machines do not live migrate. The firewall driver change could be the cause of my problem ? firewall_driver = openvswitch is mandatory for security groups log ? Please, any help ? I cannot reproduce the problem rebooting all my nodes. I rebooted them because I hat to transfer from a rack to another. Ignazio