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In case of first error code, the upgrade is halted but in case of second error code, AP ignores the error and continues to install the corrupted image resulting in AP getting stuck in boot loop. The corruption has typically manifested when image was transferred over CAPWAP over WAN link. When an image is downloaded on the flash of COS AP, an upgrade script (upgrade.sh) is executed which verifies the image and returns two success or error codes. The root cause of why image gets corrupted is not yet known and is being tracked via CSCwf09053. For the deployments where APs are located across WAN links, both predownload and efficient image upgrade are susceptible to image corruption. When an image is downloaded on the flash of COS AP, AP detects corruption, reports image verification failure but continues to boot the corrupted image and ends up in boot loop. 17.3.1, 17.3.2, 17.3.3, 17.3.4c, 17.3.5a, 17.3.6Ĭustomers looking to upgrading their Catalyst 9800 WLCs leverage features like AP image predownload or Efficient Image Upgrade (only in case of FlexConnect) to get the software image pre-downloaded to AP's flash partition, to reduce downtime needed for image upgrade.
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Cisco Catalyst 91xx Series WiFi 6 and WiFI6E Access Points.The deployments that include APs joined over WAN links are most susceptible for AP image corruption during AP Image pre-download or Efficient Image upgrade. This symptom of boot loop is tracked by the Cisco bug CSCvx32806. This document provides details on the boot loop seen on Wave2 11ac and Catalyst 11ax Access Points (APs) during image upgrade due to AP image corruption.