Stackwise 3750 48 ports flapping

Unanswered Question
Jan 8th, 2009

I am having error messages on the 3750/48port switch the error messages are displayed below we have changed the switch thinking the problem was on hardware and the stack cable was also changed but the problem is stating that the ports between switch1 and 2 are flapping:

they are running ver12.2

Switch Ports Model SW Version SW Image

1 52 WS-C3750-48P 12.2(20)SE1 C3750-I5-M

2 52 WS-C3750-48P 12.2(

message lines logged

Logging to 172.19.17.146, 27878 message lines logged

Logging to 172.19.17.150, 27878 message lines logged

Log Buffer (4096 bytes):

OWN: Line protocol on Interface FastEthernet2/0/11, changed state to down

*Jan 8 11:00:02: %ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/11: PD removed (PPML-ST1-251-2)

Jan 8 11:00:04: %LINK-3-UPDOWN: Interface FastEthernet2/0/11, changed state to down

*Jan 8 11:00:05: %ILPOWER-7-DETECT: Jan 8 12:11:02: %ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/29: PD removed (PPML-ST1-251-2)

Jan 8 12:38:06: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

Jan 8 12:38:07: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

Jan 8 12:51:50: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

Jan 8 12:51:51: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

Jan 8 12:58:56: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

Jan 8 12:58:57: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP

Jan 8 13:28:55: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

Jan 8 13:28:56: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP

Jan 8 13:41:12: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

Jan 8 13:41:13: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

Jan 8 14:20:34: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

Jan 8 14:20:35: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

Jan 8 14:20:35: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP

Jan 8 14:20:36: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

Jan 8 14:26:53: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

I have this problem too.
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Roberto Salazar Thu, 01/08/2009 - 10:38

Most of the time this is due to a faulty stackwise cable. Try replacing the stackwise cable. There isn;t much troubleshooting that can be done on a bouncing stackwise cable.

muca Thu, 01/08/2009 - 15:55

As Roberto previously stated it's usually caused by faulty cables or interfaces however it's weird cause you have replaced switch and cable. Are the screws well tightened?

Check those URL, it may help you.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_white_paper09186a00801b096a.html

aaberdeen Fri, 01/09/2009 - 01:18

Thanks chaps the stack cables were replaced and so was the swicthes( only one switch was replaced)

aaberdeen Fri, 01/09/2009 - 03:37

Hello,

Just to let you know we changed both swithes and cable and the problems is still there.

rsimmerman Wed, 02/11/2009 - 10:52

I too am having the asme problem as aaberdeen. Stackwise cables ahve been changed and one of the switches swapped. No change. H/W is c3750-48PS, (C3750-IPBASEK9-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1) Oddly I also have another stack in the building consisting of the same hardware and IOS and it is showing the same problem. I have elevated this to the third level of TAC and am awaiting any outcome of that. I have tried various diagnostics and debug options to no avail so far.

aaberdeen Thu, 02/12/2009 - 02:29

These messages dont cause any problems to your network its very annoying/worrying that your log buffered transmits them very so often.

Not too long ago cisco may have accidentally shipped out some faulty Stackwise cable worldwide.and these faulty ones are still in circulation.But this has been rectified with new ones. Best way round this get a fresh stack-cable from cisco(you should be able to get via cisco TAC/logistics).change switches 1 and 2 respectively.

This should definatly fix the problem

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