<ul>

<li> Use command <code>packstack --allinone --provision-demo=n --os-neutron-ovs-bridge-mappings=extnet:br-ex --os-neutron-ovs-bridge-interfaces=br-ex:eth0 --os-neutron-ml2-type-drivers=vxlan,flat</code> (replace ''eth0'' with appropriate interface)</li>

<li> Skip down to ''Now, create the external network with Neutron.'' and follow guidance.</li>

<li> Next move to ''Then create a router and set its gateway using the external network...'' and follow remaining guidance.</li>