[libvirt-users] "connect at power-on" NIC feature equivalent to that found in ESX

With ESX and the vSphere Client, I can enable or disable a VM's NIC to "connect at power-on". This is very useful when cloning, since you can leave the NIC not connected, power-up the VM, connect to it's console, and modify ifcfg-eth0 etc, before bringing the VM online. Is there a virsh equivalent way of doing this. Thanks....Lyle