I corrected the typos and it doesn't work ;

Full file

[root@gibsonsg neutron]# cat plug.ini.bad
[ml2]
# (ListOpt) List of network type driver entrypoints to be loaded from
# the neutron.ml2.type_drivers namespace.
#
# type_drivers = local,flat,vlan,gre,vxlan
type_drivers = vxlan
# Example: type_drivers = flat,vlan,gre,vxlan

# (ListOpt) 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.
#
# tenant_network_types = local
tenant_network_types = vxlan
# Example: tenant_network_types = vlan,gre,vxlan

# (ListOpt) Ordered list of networking mechanism driver entrypoints
# to be loaded from the neutron.ml2.mechanism_drivers namespace.
# mechanism_drivers =
mechanism_drivers =openvswitch
# Example: mechanism_drivers = openvswitch,mlnx
# Example: mechanism_drivers = arista
# Example: mechanism_drivers = cisco,logger
# Example: mechanism_drivers = openvswitch,brocade
# Example: mechanism_drivers = linuxbridge,brocade

[ml2_type_flat]
# (ListOpt) List of physical_network names with which flat networks
# can be created. Use * to allow flat networks with arbitrary
# physical_network names.
#
# flat_networks =
# Example:flat_networks = physnet1,physnet2
# Example ...