Hello James,

Thank you for the information. Unfortunately nothing seems to work in this scenario/environment. We have worked on deployments where compute nodes have a direct interface to external networks. but this dedicated network/gateway scenario has proven difficult to implement with OVN.

The main issue is displayed when we remove all bridge mappings from compute nodes (neutron_ovn_controller host group). Leaving the provider network mappings exclusively on the network/gateway hosts (neutron_ovn_gateway host group). Upon attempting to attach an interface to the external network, neutron complains about a PortBindingFailed error.

Our relevant configuration files/content: https://paste.opendev.org/show/821535/ 

I have run out of ideas here. Any help would be appreciated.

Thanks