| Configuration option=Default value | Description |
| flat_networks= | (ListOpt) List of physical_network names with which flat networks can be created. Use * to allow flat networks with arbitrary physical_network names. |
| network_vlan_ranges= | (ListOpt) List of <physical_network>:<vlan_min>:<vlan_max> or <physical_network> specifying physical_network names usable for VLAN provider and tenant networks, as well as ranges of VLAN tags on each available for allocation to tenant networks. |
