Comment 2 for bug 1720766

My concept for a solution to this issue is to destroy the patch ports between br-int and the various bridges at boot time only. That way we won't have a disruption when the network is restarted or an ifdown/ifup is done for some reason. Ideally we would only remove the patch ports from br-int to the bridges actually used by Neutron.

I'm thinking we could use a systemd service file to do this. The workflow would be:

1) Determine which bridges are used by Neutron (Scan /etc/neutron.conf? Some other method?)

2) For each bridge used by Neutron, remove the patch between br-int and the bridge