Catalyst 9800 WLC 40

[Maurice Ball]

Have anyone experience issues with bricking access points or any other issues when upgrading the WLC from software version 17.3.6 to 17.9.3?

[Leo Laohoo]

I do not understand the question.  Please elaborate or provide more information.

[marce1000]

 - Define in networking technical terminology and explanations ->  bricking access points  ? Tx!

 M.

[Maurice Ball]

What I mean by bricking is when the access point image get corrupted the during upgrade. 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. 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. 

[Leo Laohoo]

FN - 72278 - Some C9120 and C9115 APs Stuck in Bootup with 'Uncorrectable ECC Error' Displayed

[Maurice Ball]

Are Access point service packs accumulative? What I am asking is will the fixes from service pack 1 through 6 be also included in service pack 7.

[Leo Laohoo · Accepted solution]

APSP are cumulative.

[marce1000 · Accepted solution]

              >.... to install the corrupted image resulting in AP getting stuck in boot loop. 
    FYI : https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/220443-how-to-avoid-boot-loop-due-to-corrupted.html
                             https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx32806

 M.

[Maurice Ball]

Thanks

[Maurice Ball]

No, need to answer. I see that 5 and 6sp are included in ap service pack 7.