[devstack][neutron] truble with setting local.conf with neutron

Dear all, I`m trying to test neutron with qos module using devstack in OpenStack pike in a single VM environment. However, I can`t figure out how to run devstack with my local.conf[1]. While configuring network and bridges, devstack lost connection to outside VM. As a result, devstack couldn`t complete settings. My local.conf example is based on doc[2]. If you have any comments on my local.conf, reply in this mail or, if you know the working configuration, it would be glad to share with me. Regards, [1] http://paste.openstack.org/show/737586/ [2] https://docs.openstack.org/devstack/latest/guides/neutron.html