With those conditions you don't need to start any service, everything should be running and the hosts installed in the cluster will have tunnels ready on ovirtmgmt.
Thanks for that. It is clear now. We have an existing oVirt setup with logical networks created. In order to test OVN we are going to add a new cluster with switch type as OVS and the default network provider as ovirt-provider-ovn. We will then add a host to this cluster. The section 14.2.7.5 mentions "You can create an external provider network that overlays a native Red Hat Virtualization network so that the virtual machines on each appear to be sharing the same subnet." Does this mean that we should always first create a native RHV network that talks to the physical network? Is it not possible for OVN to talk directly to the physical network by using the LACP bond configured in the physical host?