[libvirt] network ethernet - device not up and ip not assigned

I'm install latest libvir and configure network to assign some ip to ethernet device. But after start tap device is down and no addresses assigned. My investigation: qemu_interface.c have functions: qemuInterfaceStartDevice and qemuInterfaceStopDevice In start device in case of ethernet device no action performed (this is bug i think). In stop device i see, that we try to assign ip address to device (why?) I think we need to move assigning addresses from stop device, to start device, also note, that for routes we need device to up (how we deal in case of user in xml specify device is down and have route element inside xml for this device?) In case of stop device i think we does not need anything (in case of linux) becaue when tap deleted routes and addresses dissapeared from the kernel. What do you think? -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru