[rdo-users] [tripleo] Neutron external bridge setting

Hi there, I sent a similar question below to OpenStack ML last week, but haven't got any answers yet. Since it is a TripleO related question, I am reposting it here and hope for a better luck. According to the TripleO documentation [1], the default Neutron external bridge (NeutronExternalNetworkBridge) is left empty. This seems to let the physical interface map to br-int instead of br-ex, and (somehow) use more CPU power as oppose to using br-ex directly. I don't get it... Does it mean the external traffic would go directly from br-int to the physical interface without using br-ex? Could someone walk me through the traffic flow in this case? I really appreciate your help! [1] https://docs.openstack.org/tripleo-docs/latest/install/advanced_deploymen... Regards, Cody