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Cisco Bug: CSCvt22353 - Cisco 2800, 3800, 4800, 1560 APs are not transmitting data frames over the air

Last Modified

Oct 22, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

8.10(122.0) 8.5(140.0) 8.5(151.0) 8.5(160.0)

Description (partial)

Symptom:
Connectivity issue experienced on new connections where client can't even move to RUN state due to DHCP failing, or, sometimes DHCP passes or client was already connected to the WLC and working fine and roams to an affected AP and seems to be a successful roam moving to RUN state, but client can't pass any more data frames for periods of time (recovering on their own, or until AP/radio are reset).

From AP debugs and OTA captures, we can see some traffic exchange, but at some point AP stops transmitting data frames over the air (could be DHCP, or ICMP, or other data traffic), affecting all clients connected at that time.

Conditions:
AP2800/3800/4800/1560 in use - this bug does not apply to any other AP platforms.

11ac MU-MIMO is in use (enabled at an active WLAN), and issue seems to be triggered when there is some load of 11ac clients that support MU-MIMO.
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