In a multitenant network, you can configure only service networks. In a flat network, you can configure only one management network and multiple service networks for each bare metal node.
A management network name must start with ironicMagNet, and must be a shared network. A service network name cannot start with ironicMagNet, and cannot be a shared network.
On the top navigation bar, click Cloud Services, and then select Classic Networks or VPCs from the Network menu.
On the Classic Networks page, click Create. To create a subnet for a network, select Create Subnet.