cat /etc/neutron/plugins/ml2/ml2_conf.ini  | grep -v "^#"
[ml2]
type_drivers = flat,vxlan

tenant_network_types = vxlan

mechanism_drivers =openvswitch

[ml2_type_flat]
flat_networks = br-ex

[ml2_type_vlan]

[ml2_type_gre]

[ml2_type_vxlan]
vni_ranges =10:100

vxlan_group =224.0.0.1

[securitygroup]
enable_security_group = True