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RRM not assigning 40Mhz channels automatically




In the past with 8.2 code I was running into CSCve24687 ( In our case this meant a lot of AP's on channel 36 power level 1 (I'm focusing on 5Ghz for now).


In the meanwhile we are running but I see that the issue remains (meaning AP's that had issues with 8.2 are displaying same channel assignments with 8.5). I tried the global restart for both 2,4 and 5Ghz but no luck. It looks like AP's that are newly installed with 8.5 are not suffering from this issue.


If I configure an AP for a static channel assignment it directly changs to a 40Mhz channel. If I revert it back to auto it keeps the 40Mhz channel width. It also changes from 36 to something.


Is there another workaround known ? We've got many AP's suffering from this issue unfortunately and I don't want to reconfigure them manually.

6 Replies 6

Rasika Nayanajith
VIP Mentor VIP Mentor
VIP Mentor

Is it single WLC environment or multi WLC environment ?



2* 5520 HA setup (so 4 physical devices). they are in the same mobility domain but AP's from WLC X do not see AP's from WLC Y (geographically separated).


@Leo Laohoo I did not try disabling the DCA because it is production environment. What does happen if you disable it. Do all AP's revert to default values ? That would be bad in our case. 

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend
No, DCA will just STOP.
But I'm not saying "disable" DCA. I said "disable and re-enable DCA". So this means disable DCA, hit Apply, enable DCA, hit Apply.

:) Yes I understood it correctly.


I think we'll raise a TAC to verify. 


I'll keep the thread updated.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend
According to the Bug ID (if the integrity is to be trusted), disable and re-enable DCA will fix the issue. Has anyone tried this before?
If the issue persist, raise a TAC Case.
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