[Rdo-list] Query on RDO networking

Hi, Do we have any documentation on whats the right way in RDO for the Nova VMs connect to external network (eg: 8.8.8.8). I asked this on #rdo but didn't get a response, hence this mail. I am aware of the br-ex - eth0/1/2 magic (i know it from my devstack experience), but wondering if we need to do the same manually on the RDO network node or there is some automation way of achieving it in RDO ? I am on a 3-node RDO setup (Controller, Network, Compute), using rdo-release-juno-1.noarch thanx, deepak