KVM virsh net-create (create network) example
net-create file
Create a transient (temporary) virtual network from an XML file and instantiate (net-start) the network. See the documentation at http://libvirt.org/formatnetwork.html to get a description of the XML network format used by libvirt.
This is similar to net-define, but doesn't make the network persistent.
To make this network persistent use net-define.