Problem with Time-Domain Reflectometer (TDR)

[Markus.Richter]

Hi,

We have an C3560CG-8PC-S Switch with ios version 12.2(55)EX3.

I've tried to investigate a connection problem using the tdr tool.

It shows the following result from which I can't drag any useful information:

Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/3     100M  Pair A     N/A                N/A         Not Completed       
                Pair B     N/A                N/A         Not Completed       
                Pair C     N/A                N/A         Not Completed       
                Pair D     N/A                N/A         Not Completed   

Port Speed is 100M, PoE is on an used with app. 7.0W

Can anyone help me out with this?

Thx in advance!

[Leo Laohoo]

On a 3560-series family of switches, sometimes a TDR takes a whopping 61 seconds before you issue the "sh cable tdr interface" command.

[Markus.Richter]

I've tried waiting some time before issuing the "sh cable-diag tdr interface ..." command.

But even after an hour nothing changend :-(

[Leo Laohoo]

Markus, 

TDR and 3560 ... they don't mix well.  Sometimes the feature works, sometimes it won't.  

Normally when I see this, I just change the cables at both ends.

[Markus.Richter]

Thx Leo,

too bad :-(

Changing the cables was task anyway due to connection problems.

[Leo Laohoo]

Oh, and upgrade your IOS.  The EX "series" of IOS is not designed for long-term production.  I like to call the EX-series of IOS as an interim-only IOS.  The objective is to get your switch "stable" (or close to) so you get it working until the main-line IOS is available.  

I'd recommend you look at upgrading to 15.0(2)SE4.