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Bug: CSCud65237 – IMPACTING ASCOM 802.11N HANDSET

I received 2 emails from colleagues who were hit by this bug while using the Ascom i62.

Apparently there is a BA ack issue, as noted in the bug. Its not clear if this is only impacting Ascom as the bug id references 802.11n handsets. I asked for frame captures and will post the result when I have them.

 

CSCud65237 Bug Details
Encryption key corruption on BA ack with wrong ID
Symptom:
Voice disruption after roamingConditions:
Third party 11n phone
This is triggered by wrong TID sent on Block ACK by client. AP is incorrectly handling the invalid frame

Workaround:
roam to another AP

Status Status
Open
(More)
Severity Severity
2 – severe Last Modified Last Modified
In Last 3 Days

Product Product
Cisco IOS software

Technology Technology
Wireless, LAN (WLAN)

1st Found-In 1st Found-in
7.0(230.0)
7.4(1.54)

Component(s) Component
ap-ampdu

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George Stefanick

George Stefanick

1 Comment

  1. December 25, 2012 at 11:24 am — Reply

    A follow up to this blog post: There is a TID issue which is the result of a bug in the Ascom phone while using 802.11n. Cisco has modified code and Ascom is working on a fix. Another work around is to disable 802.11n on the infrastructure.

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