Pretty much all links pointing to the OpenStack manuals are 404. Example: https://docs.redhat.com/en/documentation/red_hat_openstack_platform/16.2/html/network_functions_virtualization_planning_and_configuration_guide/part-dpdk-configure#p-ovs-dpdk-flavor-deploy-instance
from https://docs.openshift.com/container-platform/4.16/installing/installing_openstack/installing-openstack-nfv-preparing.html    

I suspect all versions.