思科视觉网络指数：预测与趋势 2017-2022 This forecast is part of the Cisco® Visual Networking Index™ (Cisco VNI™), an ongoing initiative to track and forecast the impact of visual networking applications. This document presents the details of the Cisco VNI global IP traffic forecast, key trends and the underlying methodology. For more global, regional and select country-level projections, refer to the VNI Forecast Highlights tool.