Solved: Query on SMU patch upgrade for 9800-L-F wlc (17.5.3)

Bdas1 · ‎10-06-2025

Hi Team,

I could see 3 SMU patches for the 17.15.3 version for 9800-L-F WLC.

Can anyone let me know which SMU patch to be installed. Or I have to install all the 3 SMUs? Is it mandatory to install SMU?

Saikat Nandy · ‎10-06-2025

As @Mark Elsen mentioned, every SMU serves a different purpose, provides fix to specific defects. Now the PSIRT bundle is for vulnerability fixes - which is applicable for most of the customers. If you are managing the WLC via CatC and doing provisioning then you can apply the 3rd one. But if you are not doing or having CatC, no need for this SMU. The 2nd one is for memory leak - which is not a catastrophic defect by nature - which means you can bypass this for the time being. There are other SMUs as well which are for specific use cases and available only through request. So long story short - first one you can apply. 3rd one you can apply if you have CatC and doing provisioning. 2nd one can be ignored for the time being.

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Mark Elsen · ‎10-06-2025

- @Bdas1 Whether it's mandatory depends if you are experiencing the mentioned problem in the SMU
description or not (and want to fix it deciding yes or no)>
Each SMU is independent and must be installed individually for it's purpose

M.

-- Let everything happen to you
   Beauty and terror
      Just keep going
     No feeling is final
Reiner Maria Rilke (1899)

Bdas1 · ‎10-06-2025

Thank you Mark for your response. The WLC is running on older version and I want to move to a suggested release. So far the bugs mentioned have not impacted. However, since going to a new version, I want to make sure I have all the patches also installed. So, wanted to make sure if it is better to install all the 3 SMUs?

Saikat Nandy · ‎10-06-2025

As @Mark Elsen mentioned, every SMU serves a different purpose, provides fix to specific defects. Now the PSIRT bundle is for vulnerability fixes - which is applicable for most of the customers. If you are managing the WLC via CatC and doing provisioning then you can apply the 3rd one. But if you are not doing or having CatC, no need for this SMU. The 2nd one is for memory leak - which is not a catastrophic defect by nature - which means you can bypass this for the time being. There are other SMUs as well which are for specific use cases and available only through request. So long story short - first one you can apply. 3rd one you can apply if you have CatC and doing provisioning. 2nd one can be ignored for the time being.