topic Re: C9800 in Wireless

C9800

CruzBarrera — Thu, 26 Mar 2026 16:17:43 GMT

I'm going to update a C9800 from version 17.9.4a to 17.15.2. Is a direct update possible, or do I need to install an intermediate version?

Re: C9800

Mark Elsen — Thu, 26 Mar 2026 16:29:15 GMT

- @CruzBarrera FYI : https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-15/release-notes/rn-17-15-9800.html#Cisco_Concept.dita_59a2987f-2633-4630-8c7b-a8e8aecdeaf7

17.9.1 to 17.9.5

Upgrade to 17.9.6 or later or 17.12.x or later, and then to 17.15.x

Upgrade directly to 17.15.x

Actually 3d column : Upgrade Path for Deployments Without 9130 or 9124
Upgrade directly to 17.15.x

(sorry for multiple iterations)

Re: C9800

CruzBarrera — Thu, 26 Mar 2026 16:35:11 GMT

Thaks so much...

Re: C9800

Leo Laohoo — Thu, 26 Mar 2026 20:07:46 GMT

@CruzBarrera wrote:
I'm going to update a C9800 from version 17.9.4a to 17.15.2. Is a direct update possible

Reboot all the APs first before doing the upgrade to maximize the chance of avoiding CSCwe15172, CSCwe97901, CSCwm08044, CSCwm07499, CSCwm72142, CSCwo05017.

Next, after upgrading to destination version, make sure to install APSP to fix CSCwf37271 & CSCws70285.

Re: C9800

CruzBarrera — Thu, 26 Mar 2026 21:45:50 GMT

Thanks a lot Leo

Re: C9800

Rich R — Wed, 01 Apr 2026 14:24:35 GMT

@CruzBarrera refer to TAC recommended code versions (link below). If you're going to 17.15 then you should be going to 17.15.4d + latest APSP.
17.15.5 will likely replace that soon.

Re: C9800

Rich R — Wed, 15 Apr 2026 11:07:16 GMT

A field notice has been released for the cnssdaemon.log problem now:
Field Notice: FN74383 - Cisco Access Points Running Cisco IOS XE Releases 17.12.4, 17.12.5, 17.12.6 or 17.12.6a May Run Out of Flash Space, Preventing Upgrades - Software Upgrade Recommended

Re: C9800

Leo Laohoo — Fri, 17 Apr 2026 03:24:21 GMT

Thanks, @Rich R.

I suspect the number of TAC & RMA cases forced Cisco to reluctantly release this FN.