Efficient Image Upgrade
Efficient Image upgrade is an efficient way of predownloading the image to the APs. It works similar to primary - subordinate model. An AP per model becomes the primary AP and downloads image from the controller through the WAN link. Once the primary AP has the downloaded image, the subordinate APs starts downloading the image from the primary AP. In this way, WAN latency is reduced. Primary AP selection is dynamic and random. A maximum of three subordinate APs per AP model can download the image from the primary AP.