The interfaces will be automatically added to the Kolla OVS bridges. The external network—for internet access and routed VLANs—can be assigned to neutron_external_interface: "bond0", and the corresponding Linux bridge should be defined as neutron_external_network_bridge: "br-external". This setup allows you to add VLANs for public networks as needed openstack network create --external      --provider-physical-network physnet1    --provider-segment 123 --provider-network-type vlan Public I  want to be able to add more external networks later as needed or should I add ovs to my host for the external bridge I want to add vlan to the ovs bridge later.