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Cisco Bug: CSCus83638 - 5-GHz radio on Cisco AP beaconing but not accepting client associations

Last Modified

Aug 20, 2017

Products (1)

  • Cisco Aironet 3700 Series

Known Affected Releases

10.2(120.0) 10.2(140.15) 15.3(3)JN 8.0(110.0) 8.2(100.0) 8.2(110.13) 8.3(102.0)

Description (partial)

Symptom:
A radio may get into a state where it beacons, but does not accept associations from clients.
  
  An over the air capture shows the AP transmitting beacons.  It does not, however, transmit probe responses.  If the client sends unicasts to the AP (unicast probe requests or auth packets), the AP does not acknowledge them.
  
  Once every 10-60 seconds, the AP may ACK some packets, and may unicast some responses, but the associations are still unable to complete.
  
  At the time when the AP is failing to ack the incoming packets, if you run radio driver debugs on the AP radio (debug dot11 dot11radio1 trace print mgmt rcv xmt), you will not see debug messages for the incoming packets.
  
  Reboot of AP temporarily fixes the issue but again come back after some time. Issue is intermittent.

Conditions:
Seen if using 5GHz radio on a 1570, 1700, 2700 or 3700 series AP
  (not seen on a 2.4GHz radio.)

Related Community Discussions

IOS AP で 5Ghz 帯を使用した無線接続ができなくなる問題
2017年12月28日 (初版) TAC SR Collection 主な問題 IOS AP において、5GHz 帯を使用した無線接続ができなくなることがあります。 この時、2.4GHz 帯では問題なく接続ができます。 原因 ソフトウェア不具合: | <key>CSCus83638</key> : 5-GHz radio on Cisco AP beaconing but not accepting client associations 解決策 <key>CSCus83638</key> | の修正バージョンにバージョンアップすることにより、この問題は発生しなくなります。 また、事象が発生してしまった場合には、radio interface の disable/enable あるいは AP の再起動により一時的に復旧します。 備考 本不具合は、Bug Search Tool でも確認できます。 Wave2 AP (3800/2800/1800 シリーズ等)では発生しません。
Latest activity: Jan 25, 2018
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