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Cisco Bug: CSCuq71068 - AP traffic issue causing client to lose layer 3 connectivity

Last Modified

Feb 14, 2018

Products (1)

  • Cisco Aironet 3700 Series

Known Affected Releases

15.3(3)JA 7.4(121.0) 7.6(120.15)

Description (partial)

A wireless client is associated to an AP and is in run state, and successfully
passing traffic.

After some time, with the client still associated to the same AP, it will
enter a state where it is unable to pass IPv4 unicast traffic.  At that time,
simultaneous packet captures from:

* client wireless adapter (nonpromiscuous)
* over the air
* AP switchport

will show that the client continues to receive multicast traffic from the AP.
However, all unicast/multicast traffic that the client transmits is
acknowledged by the AP, but the AP drops the traffic, rather than forwarding
it to the LAN.

After some time - typically several minutes - with the client still associated
to the same AP - the AP will resume passing traffic for this client.

Just before the AP starts blackholing traffic, there has been a period
where the client received unicast data from the AP - and has pushed that
data up its stack - but did not ACK that data.

Specifically, the triggering client behavior may be seen with an Intel 7260
adapter with a or earlier driver.
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