libvirtd is not happy without vlan id

[Caiman]

I do have vlans defined on host.
And when libvirtd running , logs flooded with messages as below :


tail -f /var/log/messages | grep libvirtd

Nov 9 11:23:18 dell2650 libvirtd: 14681: error : udevGetIfaceDefVlan:975 : internal error: failed to find the VID for the VLAN device 'vlan6'
Nov 9 11:23:18 dell2650 libvirtd: 14679: error : udevGetIfaceDefVlan:975 : internal error: failed to find the VID for the VLAN device 'vlan7'

also host interfaces are not manageable from libvirtd ( can not create bond,bridge.)

Are those problems related ?

gentoo qemu wiki said :
"In some cases this requires enabling the 'netcf' USE flag (currently unavailable). "

Is this a reason ?

Could sameone clarify on this ?

Thanks,
Caiman.