按照指南做
http://rdoproject.org/install/packstack/
最后一步，改为。
packstack --allinone --provision-demo=n
--os-neutron-ovs-bridge-mappings=vlan5:br-ex5,vlan4:br-ex4
--os-neutron-ovs-bridge-interfaces=br-ex5:em4,br-ex4:em3
--os-neutron-ml2-type-drivers=vxlan,flat
成功后，修改  /etc/neutron/plugins/ml2/ml2_conf.ini  两处
[ml2]
# Ordered list of network_types to allocate as tenant networks. The default
# value 'local' is useful for single-box testing but provides no connectivity
# between hosts. (list value)
#tenant_network_types = local
tenant_network_types=flat

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