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Cisco Bug: CSCtd78587 - Crash when recovering a port which was err-disabled twice

Last Modified

Jan 27, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases


Description (partial)

Symptoms: A Cisco Catalyst 6000 switch running Cisco IOS Release 12.2SX 
software might crash under rare conditions when err-disable recovery tries to 
recover a port. The following messages are seen in the logs before the switch 
resets itself:

Conditions: This symptom may be observed after the following sequence of 

1. An interface on the switch gets err-disabled as expected due to a certain 
feature; for example, due to BPDU Guard 
2. Shortly after, before BPDU Guard err-disable recovery kicks in, the same 
port gets err-disabled for a different reason; for example, because a 
diagnostic error is detected on the already err-disabled port 
3. Err-disable recovery (BPDU Guard) tries to recover the port and this leads 
to the crash.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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