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Crash Information File - Cisco WS-C3550-24-PWR

Posted on 2010-03-25
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Last Modified: 2012-05-09
HI,

I have a 3550 tswitch hat I am trying to collect crash informaiton but an unable to do so. The command I am entering is as follows:

#more bootflash:crashinfo_4355463-343456
#more bootflash:crashinfo_4355463-343456
                    ^
% Invalid input detected at '^' marker

and

# sup-bootflash:crashinfo_234252-14534534
                    ^
% Invalid input detected at '^' marker

This command needs to be entered in the enable mode, correct? Please advise.

Many thannks.
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Question by:thunder8080
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by:giltjr
ID: 28564682
Have you tried just plain flash:?

I'll have to find a 3550, but I thought they used flash: instead of bootflash:.
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Expert Comment

by:giltjr
ID: 28565056
Just checked my 3550 does not have bootflash, only flash which is the default  so:

more crashinfo_4355463-343456

or

more flash:crashinfo_4355463-343456

should work.
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Author Comment

by:thunder8080
ID: 28566905
thanks giltjr. You are right. there is no bootflash in 3550. I am getting the same error message when using the commands you mentined. Qucik quesion for you. These crash files are supposed to be created only in an even of a switch/router crash, correct? I mean, if there is no crash, there is no crash file, right? not even a empty one to be filled at the time of device crash. Just wanted to clear some doubts.

Thanks.
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by:giltjr
ID: 28582120
You are correct, the crash files should only exists if a crash occurs.  However there are times where some crashes may not be trapped or caught and so you may have a situation where there is no crash file even if a crash occured.  

So are you saying you have done either dir or dir flash: and you see crash files, but when you do more crashfilename is tells you invalid input?

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Author Comment

by:thunder8080
ID: 28604460
Hi again,
I do not see any crash file in the flash when I type in the keyword "# sh flash" or "# dir". I am still trying to find what might've happened when the switch crashed.  
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by:giltjr
ID: 28607466
What makes you think it crashed?

Are you logging to a syslog server?
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by:thunder8080
ID: 28609815
Thanks for your comment gitlgr. The show version command lists the up time for only a few hours and it happened twice in the last couple of days whhere the uptime resetted twice. Also, the network monitoring tool generated an alarm for this event.  
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giltjr earned 2000 total points
ID: 28622956
Well, unfortunately that does not really mean that it crashed.  A crash is an error that software can detect but can not fully recover from.  So the software will create a crash file and automatically restart.  Some errors can not be detected by the software and so the switch will automatically just restart.

If you do not have it sending its log information to an external syslog server I would suggest you do.  Although this may not catch what is going on, it won't hurt.  If you don't have a syslog server you can use Kiwi or Splunk, both have a free version.

There are a few reasons why it may have restarted.  If you don't have it on ups/battery all it takes is a momentary loss of power (even a sever brown out) can cause the switch to stop and restart.  Typically when we have a switch fail and automatically restart power is the issue.
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by:thunder8080
ID: 28686556
Thanks again giltjr. I typed in #show tech-support command and I see some crash files listed there under the  "show bootflash: all " header. But I don't see any crash file under the flash dir nor by typing show bootflash command. I am confused.
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by:giltjr
ID: 28686877
Can you post the output from show version?
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by:giltjr
ID: 28687335
Also post the output from:

show file system

Please.
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Author Closing Comment

by:thunder8080
ID: 31707099
Thanks!
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