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Cisco Bug: CSCvv93995 - C9115 | Clients unable to connect due to persistent Tx Error on Radio (CS00011211267)

Last Modified

Oct 23, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases


Description (partial)

AP stops serving clients.
We observe that no packets are being transmitted from the radio.
Tx Error stat keeps increasing.
TX packets:422367 errors:6610914 dropped:0 overruns:0 carrier:0
TX packets:422367 errors:6611684 dropped:0 overruns:0 carrier:0
TX packets:422367 errors:6611798 dropped:0 overruns:0 carrier:0
TX packets:422367 errors:6611877 dropped:0 overruns:0 carrier:0

At this time the AP does not stop beaconing. Beacons are the only packets which are transmitted from the Radio.

Running a client trace on AP will show only upstream dot11 auth packets
Sep 23 07:43:10 kernel: [*09/23/2020 07:43:10.4350] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)
Sep 23 07:43:10 kernel: [*09/23/2020 07:43:10.9470] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)
Sep 23 07:43:11 kernel: [*09/23/2020 07:43:11.5630] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)
Sep 23 07:43:12 kernel: [*09/23/2020 07:43:12.0780] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)
Sep 23 07:43:22 kernel: [*09/23/2020 07:43:22.6960] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)
Sep 23 07:43:23 kernel: [*09/23/2020 07:43:23.1960] <apr1v6> [U:W] DOT11_AUTHENTICATION : (.)

COS AP running 16.12.4a

Possible : Multiple channel changes due to radar detection
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