General discussion


PoE question...

By TypeOctoberRust ·
We recently installed a cisco 3560 PoE 48 port switch. This morning I went to trace a network line that was plugged into this switch using a fluke meter to tone the line. When I went back to the switch, I notice all the lights off and it was in reboot stage. When I checked the logs it said:

System returned to ROM by error - Debug Exception (Could be NULL pointer derefer
ence) Exception (0x2000)!, PC 0x25E990

On Cisco's website, it says workaround is none at this time. And has a status of Unreproducible.

This is are first power over ethernet switch. Is a special Fluke meter required when dealing with PoE? The Fluke meter is a OneTouch 10/100 Network Assistant. I believe its about 3 or 4 years old.

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Probably get a better response

by JamesRL In reply to PoE question...

If you posted this in the Technical Q&A section.


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by skywalker_al In reply to PoE question...

Please let me know what you find out, we just got our first 24 port installed 2 weeks ago.


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by TypeOctoberRust In reply to

This came direct from a Cisco Tech:
I decoded the stack trace and found a bug CSCsa72400. However this bug has been marked 'Unreproducible'. We have not been able to reproduce this issue inhouse. However there have been a lot of changes with the inline power software code between 12.2(20)SE4 and 12.2(25)SE. And this issue seems to not occur after upgrading to 12.2(25)SE and higher.

I found several cases attached to this bug and in some of the cases the crash was caused when a fluke meter was connected to a port.

The customers which hit this issue, did not see this issue after upgrading to 12.2(25)SEA or higher. I would recommend upgrading to 12.2(25)SEB as soon as possible.

I am upgrading the OS this weekend. I will let you know how it turns out. I would suggest upgrading to the latest OS on yours, just to be safe.

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Wrong forum.

by deepsand In reply to PoE question...

This is a tech. problem, in search of a solution.

It properly belongs in "Technical Q&A," not in "Discussions." Please re-post there.

Not only will you be more likely to attract the attention of those seeking to provide answers, but you will also make it easier for those seeking discussions to find such.

Thank you.

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