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Folks in the #openstack-kolla channel answered this for me saying that the neutron_external_interface should be an interface that will be able to reach the internet, it will be added to the br-ex bridge interface (layer 2), the IP (layer 3) configuration will be managed by Neutron/OpenVSwitch.

I'm still having problems at the moment though, my br-ex is showing as DOWN in my IP configuration, I'm going to post a new question about this and link to that from this answer when I've posted it.

Folks in the #openstack-kolla channel answered this for me saying that the neutron_external_interface should be an interface that will be able to reach the internet, it will be added to the br-ex bridge interface (layer 2), the IP (layer 3) configuration will be managed by Neutron/OpenVSwitch.

I'm still having problems at the moment though, my br-ex is showing as DOWN in my IP configuration, I'm going to post a new question about this and link to that from this answer when I've posted it.

Edit: This was follow-up question: https://ask.openstack.org/en/question/101599/establishing-instance-internet-connectivity-with-kolla/