06-25-2014 11:54 AM - edited 03-07-2019 07:50 PM
Hi there,
I hope someone can help me.
I don't have much experience with switches, I'm doing the desktop support in our company.
We have Catalyst 4510 R+E to 2 Catalyst 2960 switches and seperate VLAN's for IP Phones and for Internet in one part of our office.
Now I'm running into trouble with some IP Phones that are connected to the 2960 switches. It appears only to happen with Cisco's SPA-512. I've tried FW 7.5.2, 7.5.5 and 7.5.5b. These phones sporadically drop the call / connection, with the red MIC button blinking. Based on my research this means that it looses Internet connection. I have 1 SPA512 with FW 7.5.1 that does not show these symptoms.
I have other phones SPA942 and Polycom IP335 in the same area behind the same switches and no issues.
We've tried to disable auto negotiate and set a fixed transmition rate or either 1Gbps and 100Mbps, both without success.
I also have SPA512 in other areas of the office just connected to our Catalyst 4510 R+E and they work just fine. That's why I don't believe it has anything to do with the 4510, but I can be wrong.
That's all I have for you guys. Hope someone can help me to fix / troubleshoot this..
Frank
06-25-2014 02:31 PM
What is the exact model of your 2960?
06-26-2014 02:31 PM
2960-X series
C2960x-48FPD-L V01
06-26-2014 07:41 PM
Run a TDR on the link to the phone.
Post the output to the TDR and we should be able to help you decipher.
06-27-2014 06:45 AM
SSwitch3#test cable-diagnostics tdr int g1/0/16
TDR test started on interface Gi1/0/16
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
SSwitch3#show cable-diagnostics tdr int g1/0/16
TDR test last run on: June 27 13:39:21
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/16 1000M Pair A 52 +/- 10 meters Pair A Normal
Pair B 52 +/- 10 meters Pair B Normal
Pair C 52 +/- 10 meters Pair C Normal
Pair D 52 +/- 10 meters Pair D Normal
SSwitch3#
06-27-2014 06:55 AM
Line test looks good.
So Gi 1/0/16 goes to this phone?
06-27-2014 07:09 AM
Yes, correct.
Or let me say I guess..:)
It's port #16 on this switch...
Not sure what the rest means..
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