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Cisco Bug: CSCvv32690 - AP1832 transmits with non-standard modulation (MCS9 20 MHz SS2) (SF 04766021)

Last Modified

Oct 08, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

8.5(161.0)

Description (partial)

Symptom:
AP transmits messages over the air with modulation flags for 256QAM 5/6 when configured for 20 MHz Channel Width and negotiated speed of MC9 SS2.
This modulation + channel width + spatial stream combination is not allowed.

Conditions:
> 1830/1850 AP configured for 20 MHz channel width in 5GHz band.
> Code version 8.5.161.0
> Client speed negotiation for MCS9 SS2.
> Controller model is not relevant for the issue.
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