code: func (ncc *SeesawNCC) LBInterfaceAddVLAN(vlan *ncctypes.LBInterfaceVLAN, out *int) error {
  	netIface, err := vlan.Iface.Interface()
  	if err != nil {
  		return err
  	}
  	return ifaceAddVLAN(netIface, vlan.VLAN)
  }
docs: // LBInterfaceAddVLAN creates a VLAN interface on the load balancing interface.