Hello Dimitry,

Thanks again for your help. Unfortunately, we've tried everything that's been suggested to no avail. And it seems plausible that external connectivity will not be achieved on the compute nodes if there are no bridges mapped to the external network on those hosts. Keep in mind these compute hosts do not have the ens2 physical interface to bind the ext-br or br-flat bridges to.

Having said that, we would have loved to see a complete OVN scenario reference configuration with dedicated networking/gateway nodes. 

The documentation we have reviewed assumes compute nodes as gateways and that bridges can be set up on compute nodes, which is not our case. We are relying 100% on a single L3 interface on compute nodes with GENEVE as a tunneling protocol. And it is because of GENEVE that private east/west traffic works without a problem.

Only networking nodes have that second ens2 network interface that physically connects to the external network, hence the need to make those chassis as gateway nodes.

Again, our setup has the following configuration:

-Compute nodes with x1 L3 NIC and IP. 

-Network/gateway nodes with x1 L3 NIC and x1 L2 NIC with connection to external network. 

Thank you.