Not_robust_unicast_frame on 2.4GHz

Technical Support for Routers
1

On a Beryl GL-MT3000 running v4.2.3, I see an unending stream of logged messages in repeater mode when the Internet-side network is 2.4GHz. The connection goes down about once a minute. It is perfectly stable and no messages when connected at 5GHz.

I tried resetting the configuration and using default settings. The behavior was the same:

[ 469.720575] 7981@C15L1,PMF_PerformRxFrameAction() 1492: [PMF] : NOT_ROBUST_UNICAST_FRAME, FC->SubType=13 (wcid=1)
[ 469.769203] 7981@C15L1,PMF_PerformRxFrameAction() 1492: [PMF] : NOT_ROBUST_UNICAST_FRAME, FC->SubType=13 (wcid=1)
[ 470.712289] 7981@C15L1,PMF_PerformRxFrameAction() 1492: [PMF] : NOT_ROBUST_UNICAST_FRAME, FC->SubType=13 (wcid=1)
[ 471.639813] 7981@C15L1,PMF_PerformRxFrameAction() 1492: [PMF] : NOT_ROBUST_UNICAST_FRAME, FC->SubType=13 (wcid=1)
[ 471.737200] 7981@C15L1,PMF_PerformRxFrameAction() 1492: [PMF] : NOT_ROBUST_UNICAST_FRAME, FC->SubType=13 (wcid=1)

2

The problem turned out to be triggered by aggressive band steering from Unifi APs, with the Beryl set so it was forced to stay on 2.4 GHz.

3

Neat. I’m glad you got it sorted. Feel free to mark that ‘Solution’ to let others know.