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Cisco Bug: CSCvt23051 - Cisco 9120AX AP: 17.1.1: AP does not use the correct datarates

Last Modified

Aug 29, 2020

Products (34)

  • Cisco IOS
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst 9300-48P-E Switch
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Known Affected Releases

16.12.1 17.1.1s

Description (partial)

Symptom:
9120AX: 17.1.1: AP is not using correct datarates

from <show controllers dot11 radio0> we see following rates allowed:

Rate Config:
====================
Legacy Rates(Mbps): 12 18 24 36 48 54 

in the OTA we can see the AP:

Tag: Supported Rates 1(B), 2(B), 5.5(B), 11(B), [Mbit/sec]
    Tag Number: Supported Rates (1)
    Tag length: 4
    Supported Rates: 1(B) (0x82)
    Supported Rates: 2(B) (0x84)
    Supported Rates: 5.5(B) (0x8b)
    Supported Rates: 11(B) (0x96)

While the 2802 AP is connected to the same WLC with the same tags applied:
Showing the following supported rates in OTA:

Tag: Supported Rates 12(B), 18, 24, 36, 48, 54, [Mbit/sec]
    Tag Number: Supported Rates (1)
    Tag length: 6
    Supported Rates: 12(B) (0x98)
    Supported Rates: 18 (0x24)
    Supported Rates: 24 (0x30)
    Supported Rates: 36 (0x48)
    Supported Rates: 48 (0x60)
    Supported Rates: 54 (0x6c)

Conditions:
9120 APs running 17.1.1s
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