I setup a three node integration environment by vagrant, which used virtualbox network. Openstack rocky is installed by devstack, then I replaced neutron backend with Opendaylight Fluorine SR1, https://github.com/yyang13/openstack-netvirt/ has detailed setup topology and configuration info.

https://lists.opendaylight.org/pipermail/netvirt-dev/2019-January/007746.html is discussion thread in netvirt-dev mailling list.