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Block Ack / Delete Block Ack Loop & Performance Degradation

Hi folks,

 

I had an issue yesterday that I figured I'd run by the community before opening a TAC case. I got a report of poor performance at a particular location in a building. After arriving, I narrowed it down to a specific 5Ghz radio on Ch. 116. I took a packet capture and found an Intel device in what I could only describe as an endless loop with the radio sending a Block ACK Request and the client replying with a Delete Block ACK 802.11k action frame. This repeated over and over and made the radio essentially unusable (I couldn't even get an ARP reply from the default gateway). From a metrics perspective, everything looked good. Channel utilization, SNR, client health, etc was all within acceptable levels. I eventually pinned it to an HP laptop sitting idlely on a user's desk (he was on vacation). Toggling off wifi on the laptop resolved the issue.

 

Anyone seen something like this before? Packet capture attached (rename file extension to .pcap).

Guru Elite

Re: Block Ack / Delete Block Ack Loop & Performance Degradation

Turn off 802.11k or enable Quiet IE in your 802.11k configuration.



Colin Joseph
Aruba Customer Engineering

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