Comment 14 for bug 1792493

It is only an issue with respect to the external bridge configuration, which includes ext-net for floating IPs. If there are multiple bridges defined, such as ext-net, br-prov001, br-prov001, etc., all associated with VLANs on the same physical interface, or a team/bond interface, the same MAC address is given to all of these physical interfaces, and this appears to be where the problem lies. Once the MAC address was forcefully changed to unique MAC addresses per VLAN on a physical interface, then external bridges have worked perfectly.