With openstack-packstack openstack-packstack-2013.1.1-0.29.dev683.el6.noarch and the following in a packstack answers file: CONFIG_QUANTUM_L2_PLUGIN=openvswitch CONFIG_QUANTUM_OVS_TENANT_NETWORK_TYPE=gre The generated /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini has an OVS section that looks like this: [OVS] tunnel_id_ranges=1:1000 integration_bridge=br-int tenant_network_type=gre enable_tunneling=False With enable_tunneling=False, this causes the quantum-server to throw an error and refuse to start. This has been fixed in more recent revisions of the "grizzly" branch in the packstack repository (45b92dee9b1e4a29a6e442d20ba1150ab4625584).
I changed this bug to RHOS specific thinking it's not fixed yet. I was wrong. Changing product back. Sorry for that.