POE not working on all ports for 2960s switch.

[MOHD SYAFIQ]

Hi,

I have a  POE issue not working. I see this message in the log before my AP disassociated. 

"Nov  4 05:19:48: %HARDWARE-3-MCU_I2C_READ_ERROR: I2C read failed in MCU and attached devices (e.g. Temperature Sensor) can't be read."

Here is the output of "show power inline"

IBHQSWCL20A1#sh power inline

Module   Available     Used     Remaining
          (Watts)     (Watts)    (Watts)
------   ---------   --------   ---------
1           370.0       53.2       316.8
2           370.0       30.8       339.2
Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/2   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/3   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/4   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/5   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/6   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/7   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/8   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/9   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/10  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/11  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/12  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/13  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/14  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/15  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/16  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/17  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/18  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/19  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/20  auto   on         7.0     Ieee PD             2     30.0
Gi1/0/21  auto   off        0.0     n/a                 n/a   30.0
Gi1/0/22  auto   on         15.4    Ieee PD             3     30.0
Gi1/0/23  auto   on         15.4    Ieee PD             3     30.0
Gi1/0/24  auto   on         15.4    Ieee PD             3     30.0
Gi2/0/1   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/2   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/3   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/4   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/5   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/6   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/7   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/8   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/9   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/10  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/11  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/12  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/13  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/14  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/15  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/16  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/17  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/18  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/19  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/20  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/21  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/22  auto   on         15.4    AIR-LAP1142N-C-K9   3     30.0
Gi2/0/23  auto   off        0.0     n/a                 n/a   30.0
Gi2/0/24  auto   on         15.4    AIR-LAP1142N-C-K9   3     30.0
IBHQSWCL20A1#

As you can see, for interface Gi1/0/22-24, the device shown there are IEEE PD. After I shut and no shut the port, switch didn't detect any device. Then I connect the 3 APs to secondary switch for temporary. 

How to solve this?

Regards,

Syafiq

[devils_advocate · Accepted solution]

Have you tried a different port?

Tried plugging the AP straight into the switch with a short patch cable to rule out a structured cable issue?

Tried rebooting the switch?

[MOHD SYAFIQ]

Have you tried a different port? 

---> Yes

Tried plugging the AP straight into the switch with a short patch cable to rule out a structured cable issue?

---> Yes, I plug AP to the switch directly but not powered up. Then I connect to secondary switch, all three APs up.

Tried rebooting the switch?

---> Not yet. I will reboot this Saturday after IOS upgrade. 

If the problem not resolve after reboot and upgrade, do I need to replace the switch?

Thanks,

Syafiq

[MOHD SYAFIQ]

The problem solved by power cycle the switch. Reload command didn't solve it. 

This article is helpful

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/g_power_over_ethernet.html

Anyway, thanks for your advice. Have a nice day.

Regards,

Syafiq

[jackson.ku]

Hi,

Do the issue happen again after you power cycle this switch?

Best Regards,

Jackson

[MOHD SYAFIQ]

Hi Jackson,

Since I'm not the resident engineer for that customer since 2015, I dont know whether the issue occurs again. But as for last time, power cycle the switch solved the problem.

Regards,

Syafiq

[jackson.ku]

Got it, thanks a lot.

[Chidojohnkingsley92]

Is a hardware issue follow the link below to solve it .

https://youtu.be/zGdYVwBtMPU?si=XRLxFLbXRQWxrgdX