Difference Between a Reload via IOS Command and Loss of Power

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Basic troubleshooting on cisco devices is to always check the SHOW VERSION and SHOW LOG every time you go into a router or switch to see if it reloaded or any interesting errors in the log.

Here is the difference between a reload by loss of power and a reload by IOS Command RELOAD.

Loss of power:

Router uptime is 3 minutes
System returned to ROM by power-on
System image file is "flash:c2600-ik9o3s3-mz.123-19.bin"

Reload command:

Router uptime is 0 minutes
System returned to ROM by reload
System image file is "flash:c2600-ik9o3s3-mz.123-19.bin"

Again..very basic, but very useful.

 

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Thanx NetEyeBall. That's useful to know.

 

yeah, thanks

 

Another thing to check is the flash memory on the router. If a router has reloaded look in the flash for a crash file. For example:

Godel#sh fla

System flash directory:
File Length Name/status
1 15569532 c2600-ik9o3s3-mz.123-1.bin
2 354140 crashinfo_20050806-113627
3 327489 crashinfo_20050809-102119
[16251356 bytes used, 1572 available, 16252928 total]
16384K bytes of processor board System flash (Read/Write)

This router crashed twice, reloading automatically, but no one noticed because it booted fairly quickly.

Spice_Weasel

 

Wow! Cool! IS that a date and time stamp on the crash file?

 

Yes, date and time. Actually, I'd better move those crashinfo files off the router, the flash is full:

[16251356 bytes used, 1572 available, 16252928 total]
16384K bytes of processor board System flash (Read/Write)


Spice_Weasel

 

Ok..I tried to recreate this to see the crash file. But it didn't write one to the flash. Is there anything that should be enabled?

 

Crashinfo files are written to your flash automatically. However, you need to crash the router create one

They are typically caused by stack or data corruption. Whenever I see one I start the bug hunt on Cisco's bugtool, usually that will turn up something. Then on to TAC if needed.

Spice_Weasel

 

Thanks! Something else to look for!!!