2821 router returns unknown error and get restarted

Unanswered Question
Apr 26th, 2008

The error Description is listed below.

Cisco IOS Software, 2800 Software (C2800NM-ENTSERVICESK9-M), Version 12.4(3h), R


Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Wed 25-Jul-07 15:20 by stshen

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

SCB_NPL_LPR_CE01 uptime is 8 hours, 22 minutes

System returned to ROM by error - an unknown failure, PC 0x4133DE8C at 21:20:31

UTC Sat Apr 26 2008

System image file is "flash:c2800nm-entservicesk9-mz.124-3h.bin"

Please help me to isolate and solve this problem.

I have this problem too.
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Paolo Bevilacqua Sun, 04/27/2008 - 01:07

Hi, you have two choices:

- blind upgrade to 12.4(3j), it's possible that won't happen anymore.


- in "show tech" at some point there is a stack trace, paste it into output decoder tool (requires customer-level CCO access), this can give you an idea of the what is happening actually.

Joseph W. Doherty Sun, 04/27/2008 - 05:16

Paolo, I've noticed you've recommended 12.4(3j) on other posts instead of a higher release like 12.4(19). Is your thinking since 3j is current, it avoids possible new bugs that might be caused by features introduced with higher 12.4 releases?

Paolo Bevilacqua Tue, 04/29/2008 - 08:21

Hi, yes my line of thinking is like that, also consider the latest 12.4(3) is the default for shipping with new routers, so it seems they focus on it having the less bugs possibile.

Parikshit Sharma Tue, 04/29/2008 - 23:43


were there any changes before the issue? is this the first time that the issue has happened on this chassis? what is the current status?

The error you encountered is a "Less Common Types of System Crash"

See this url :


I would recommend you to open a TAC case for the issue so that a dedicated TAC Engineer looks at it.



Cisco Systems


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