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OPERATIONAL DEFECT DATABASE
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iPhone11, MBP M1, Intel AX201 (with new driver version ? March 2021) experience deafness when AP is in problem state. iPhone12, Samsung Galaxy S10, Intel AX201 (with old driver version ? Aug 2019) do not experience deafness when AP is in problem state and always work fine. 11ac clients can associate. Clients are unable to receive DHCP address and are stuck in IP learn state (on WLC).
9130 APs and Bss coloring feature enabled (default is enabled on WLC). 9800 and Airos WLCs are impacted where 9130 is used.
Disable BSS Coloring. (on both 2.4 and 5ghz bands). 9800: GUI: Configurations --> Radio parameters --> 5ghz --> 11ax parameters -> BSS coloring Configurations --> Radio parameters --> 24ghz --> 11ax parameters -> BSS coloring eWLC-9(config)#ap dot11 5ghz shutdown Disabling the 802.11a network may strand mesh APs. Are you sure you want to continue? (y/n)[y]: y eWLC-9(config)#no ap dot11 5ghz dot11ax bss-color eWLC-9(config)#no ap dot11 5ghz shutdown eWLC-9(config)#exit 2.4Ghz eWLC-9(config)#ap dot11 24ghz shutdown Disabling the 802.11b network may strand mesh APs. Are you sure you want to continue? (y/n)[y]: y eWLC-9(config)#no ap dot11 24ghz dot11ax bss-color eWLC-9(config)#no ap dot11 24ghz shutdown eWLC-9(config)#exit eWLC-9(config)#wr eWLC-9#show ap dot11 5ghz network | i BSS BSS Color : Disabled eWLC-9#show ap dot11 24ghz network | i BSS BSS Color : Disabled show ap dot11 5ghz summary extended Airos: GUI: Wireless --> 802.11a/n/ac/ax --> Network --> BSS color Wireless --> 802.11b/g/n/ax --> Network --> BSS color (Cisco Controller) >config 802.11b disable network Disabling 802.11b network may strand mesh APs. Are you sure you want to continue? (y/n)y (Cisco Controller) >config 802.11a disable network Disabling the 802.11a network may strand mesh APs. Are you sure you want to continue? (y/n)y (Cisco Controller) >config 802.11a 11axSupport bss-color global disable (Cisco Controller) >config 802.11b 11axSupport bss-color global disable (Cisco Controller) >config 802.11b enable network Disabling 802.11b network may strand mesh APs. Are you sure you want to continue? (y/n)y (Cisco Controller) >config 802.11a enable network Disabling the 802.11a network may strand mesh APs. Are you sure you want to continue? (y/n)y verify: show advanced 802.11a summary or use show run-config
The symtom also recovers temporarily on a channel change or radio reset but a better workaround is to turn off feature completely until complete fix is made available.