Re: Switch 3560 not giving out power

edithflore · ‎09-27-2011

I have an issue with a 3560 in my network, after sometimes it fails to give out power to some ip phones,while others are not affected and below is the message i get

"Power given, but Power Controller does not report Power Good"

output of sh power inline and sh env all : everything seems to be ok on the switch

#sh power inline

Available:450.0(w) Used:48.0(w) Remaining:402.0(w)

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi0/1 auto off 0.0 n/a n/a 15.4

Gi0/2 auto off 0.0 n/a n/a 15.4

Gi0/3 auto off 0.0 n/a n/a 15.4

Gi0/4 auto off 0.0 n/a n/a 15.4

Gi0/5 auto off 0.0 n/a n/a 15.4

Gi0/6 auto on 9.6 AIR-AP1131AG-E-K9 3 15.4

Gi0/7 auto on 9.6 IP Phone 7940 n/a 15.4

Gi0/8 auto off 0.0 n/a n/a 15.4

Gi0/9 auto off 0.0 n/a n/a 15.4

Gi0/10 auto off 0.0 n/a n/a 15.4

Gi0/11 auto on 9.6 IP Phone 7941 2 15.4

Gi0/12 auto off 0.0 n/a n/a 15.4

Gi0/13 auto off 0.0 n/a n/a 15.4

Gi0/14 auto off 0.0 n/a n/a 15.4

Gi0/15 auto off 0.0 n/a n/a 15.4

Gi0/16 auto off 0.0 n/a n/a 15.4

Gi0/17 auto on 9.6 IP Phone 7961 2 15.4

Gi0/18 auto on 9.6 IP Phone 7975 3 15.4

Gi0/19 auto off 0.0 n/a n/a 15.4

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi0/20 auto off 0.0 n/a n/a 15.4

Gi0/21 auto off 0.0 n/a n/a 15.4

Gi0/22 auto off 0.0 n/a n/a 15.4

Gi0/23 auto off 0.0 n/a n/a 15.4

Gi0/24 auto off 0.0 n/a n/a 15.4

#sh env all

FAN is OK

TEMPERATURE is OK

Temperature Value: 18 Degree Celsius

Temperature State: GREEN

Yellow Threshold : 49 Degree Celsius

Red Threshold : 59 Degree Celsius

SW PID Serial# Status Sys Pwr PoE Pwr Watts

-- ------------------ ---------- --------------- ------- ------- -----

1 C3K-PWR-750WAC DTN1233E1KB OK Good Good 300/450

SW Status RPS Name RPS Serial# RPS Port#

-- ------------- ---------------- ----------- ---------

1 <> <>

It's solved by a reboot of the switch, i need your assistance to know what exactly is wrong and how solve this issue once for good, i could have suspected a power environnment issue but it's the only equipement disturbing in the network.

Leo Laohoo · ‎09-27-2011

What IOS are you running?

Can you do the following:

1. Command: test cable tdr int ;

2. Wait for about 5 to 7 seconds;

3. Command: sh cable tdr int ; and

4. Post the complete output please.

edithflore · ‎09-28-2011

below the ouput for 2 ports

Interface Speed Local pair Pair length Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Gi0/2 auto Pair A 38 +/- 1 meters N/A Short/Impedance Mism

Pair B 42 +/- 1 meters N/A Open

Pair C 38 +/- 1 meters N/A Short/Impedance Mism

Pair D 48 +/- 1 meters N/A Short/Impedance Mism

TDR test last run on: September 28 08:47:45

Interface Speed Local pair Pair length Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Gi0/17 auto Pair A 149 +/- 1 meters N/A Normal

Pair B 151 +/- 1 meters N/A Normal

Pair C 35 +/- 1 meters N/A Short/Impedance Mism

Pair D 21 +/- 1 meters N/A Short/Impedance Mism

The strange thing is, even when the phone is directly connected to the switch it still doesn't work unless I reboot the switch

SunilKhanna · ‎09-28-2011

Did you tried in any other port? What was the result?

Regrads,

Sunil

Regards, Sunil Khanna

edithflore · ‎09-29-2011

I've tried but it doesn't work until i reboot the switch

2011/9/28 sunkhann

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ankugarg · ‎09-27-2011

I have seen this message sometimes..It generally happens when switch boots up and all the devices request for power together...Mostly reload of the box solves the issue

edithflore · ‎09-28-2011

and the IOS version is Version 12.2(35)SE5

Leo Laohoo · ‎09-28-2011

Mostly reload of the box solves the issue

Sorry Ankur. I will have to disagree with you on this as I see this on a daily basis.

The TDR result is very "accurate". Pair C and D both shows signs of bad cabling.

Pair C controls PoE and Pair D controls GigabitEthernet.

The error message of "Short/Impedance Mism" is not good. A good result to a patched outlet is "Normal".

Another thing: Take a look at the distance of Pairs A & B. This figure is not THAT accurate but it does give me a worry that the cabling at the far end could be faulty or the patch port at the far-end could be faulty.

NOTE: Whoever thought about putting a TDR into the switches deserve a raise. You have no idea how much money we saved with this function.

ankugarg · ‎09-29-2011

Hey,thanks leolaohoo for correction...I also face these issues regularly..Can you refer to any document which tells how to debug them,ot has more info on above commands ?

How about writing a blog article on this troubleshooting ?

Leo Laohoo · ‎09-29-2011

Can you refer to any document which tells how to debug them,ot has more info on above commands ?

To be honest with you, the Cisco documents for the TDR is very, very vague. My experience with this feature has all been through trial-and-error. If I publish a "blog", is there a way for the document be vetted and the original document be improved or updated?

Leo Laohoo · ‎10-09-2011

Hey Ankur,

I've finished a Guide. I'm going to submit the docu to the NetPro/CSC administrator for approval.

Leo Laohoo · ‎10-11-2011

How to use Time-Domain Reflectometer (TDR)

ankugarg · ‎10-12-2011

Hey thanks a lot..Thats very useful document..I'm in the process of trying somethings from your document..Will get back in documents section..Thanks again

Leo Laohoo · ‎10-13-2011

Hi Ankur,

Please provide feedback so I can improve the document.

Sent from Cisco Technical Support iPhone App

edithflore · ‎09-29-2011

Reloading the switch frequently is my real issue,

Have a look a this test, i connected the phone directly to the switch with a pretested cable, does the result below shows that the ports have issues ?

TDR test last run on: September 28 09:49:33

Interface Speed Local pair Pair length Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Gi0/20 auto Pair A 2 +/- 1 meters N/A Short/Impedance Mism

Pair B 2 +/- 1 meters N/A Open

Pair C 9 +/- 1 meters N/A Short/Impedance Mism

Pair D 21 +/- 1 meters N/A Short/Impedance Mism

voice-data-3560-yde#

TDR test last run on: September 28 09:51:21

Interface Speed Local pair Pair length Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Gi0/22 auto Pair A 2 +/- 1 meters N/A Open

Pair B 2 +/- 1 meters N/A Short/Impedance Mism

Pair C 11 +/- 1 meters N/A Short/Impedance Mism

Pair D 6 +/- 1 meters N/A Short/Impedance Mism