https://review.openstack.org/#/c/410385 has made port_security extension mandatory ( https://bugs.launchpad.net/neutron/+bug/1694420) Although there are some discussions and a proposed patch to add a fallback mechanism when extension is not enabled https://review.openstack.org/#/c/469327/, i think it's better to enable it in packstack to be able to promote master and avoid similar issues. Change-Id: I609f7901c4e2ec8dfdcc6c2a8e8ee775d7ca74ad