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3750 PoE issues when stack and RPS used

Hi guys!

I had an issue with a couple of 3750 switches connected in stackwise mode. They were providing PoE to many IP phones and Access Points. Also, they were connected to the same RPS.

I had to reboot both switches and after that the PoE of one of the switches stayed in OFF mode. I rebooted both switches one more time but PoE was still unavailable. The "show power inline" command showed status OFF for one switch (the slave). I replaced the slave switch and the issue continued. I connected the switches to a different port in the RPS and that didn't change things.

I had to disconnect the stack cable and created a trunk between both switches in order to make the PoE working again on both switches.

What could be the cause of this? The RPS? Or is there a bug maybe?

Thanks in advance for any input.



Re: 3750 PoE issues when stack and RPS used


Can you post output of show version from each switch ?



Re: 3750 PoE issues when stack and RPS used


Both switches have the same version and feature set:


Cisco IOS Software, C3750 Software (C3750-ADVIPSERVICESK9-M), Version 12.2(25)SED1, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Tue 22-Nov-05 23:37 by yenanh

Image text-base: 0x00003000, data-base: 0x0119A6B0

ROM: Bootstrap program is C3750 boot loader

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEC, RELEASE SOFTWARE (fc4)

FIFCOIAKSW1ADM uptime is 1 day, 20 hours, 10 minutes

System returned to ROM by power-on

System image file is "flash:/c3750-advipservicesk9-mz.122-25.SED1.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco WS-C3750-48P (PowerPC405) processor (revision K0) with 118784K/12280K bytes of memory.

Processor board ID CAT1115NKXE

Last reset from power-on

8 Virtual Ethernet interfaces

96 FastEthernet interfaces

8 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address : 00:1B:90:B0:56:00

Motherboard assembly number : 73-9675-11

Power supply part number : 341-0029-05

Motherboard serial number : CAT11155U05

Power supply serial number : DTN111440Y3

Model revision number : K0

Motherboard revision number : B0

Model number : WS-C3750-48PS-S

System serial number : CAT1115NKXE

SFP Module assembly part number : 73-7757-03

SFP Module revision Number : A0

SFP Module serial number : CAT11155GFA

Top Assembly Part Number : 800-25858-03

Top Assembly Revision Number : J0

Version ID : V05

CLEI Code Number : COM1W00ARB

Hardware Board Revision Number : 0x01

Switch Ports Model SW Version SW Image

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

* 1 52 WS-C3750-48P 12.2(25)SED1 C3750-ADVIPSERVICESK

Configuration register is 0xF

Re: 3750 PoE issues when stack and RPS used


I have exactly same model switches running without any problem with IPBase.

I have version 12.2(25)SEE2 on one stack

I also have another stack running version 12.2(35)SE5.

Try upgrading and see if it helps

Hope This Helps.....


Re: 3750 PoE issues when stack and RPS used

I'll try to upgrade the IOS but I think first I'll try a different RPS. I'll let you know. Thanks a lot!

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