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Hi,

  • Kolla reads neutron_external_interface variable.
  • The create a bridge br-ex in OVS (not the host/hypervisor)
  • Lastly attach the interface into the bridge.

https://github.com/openstack/kolla/blob/master/docker/openvswitch/openvswitch-db-server/ovs_ensure_configured.sh#L12,#L21

The host does not need configuration file for the bridge nor the interface manually attached as OVSport in the bridge. Only need a interface UP with no IP address associated to it. When a network is created, the traffic will flow through:

bridge (br-ex) -> physical interface (eth2) -> external router/switch outside openstack (neutron gateway)

Regards