3750-X stack port question

[6tgreene]

We have 50 network closets all with 3750-x switches. Every now and then we receive the following error on switches that have been up and running with no issues for a long time. We have checked the stack cables they are tight and the swiches are no rebooting all switches in this stack have been up for 22 weeks thanks.

%STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN

Jun 17 10:17:29: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 3 has changed to state DOWN

Jun 17 10:28:38: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP

Jun 17 10:28:39: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 3 has changed to state UP

[Rick Morris]

Does this happen to all the switch stacks or only certain ones?

I am assuming you have changed the stacking cables?

[InayathUlla Sharieff]

Try changing the Stack Cables.

Whats the firmware version running on the switch?

[6tgreene]

I have changed the stack cables, and it does not happen to all the switches in the stack. The log I posted is from a 6 swtich stack.

I also have 2 switch stacks that it happens to also.

[6tgreene]

I have one stack with the following output.

Switch Ports Model              SW Version            SW Image                

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

*    1 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

     2 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

     3 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

     4 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

     5 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

     6 54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M    

I also have a 2 switch stack with the same issue

Switch   Ports  Model              SW Version              SW Image           

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

*    1   52     WS-C3750-48TS      12.2(25)SEA             C3750-I9K91-M      

     2   52     WS-C3750-48P       12.2(25)SEA             C3750-I9K91-M    

[Rick Morris]

During the stacking dropping and adding is there any impact to the users?

I have seen a lot of weird issues with the 3750X IOS that has a lot of bugs but nothing service impacting.  For instance, almost from day 1 there is a CPU issue that shows the HULC LED process at 20%, and the total cpu processor around 40% utilization.  This is a known bug in the code that they have not fixed in at least 3 versions that I know of.

I am not suggesting it is a bug but I would not be suprised to find out that it is not service impacting and mearly a cosmetic issue (bug) in the code.

[6tgreene]

Correct, there is no service impact to users on the stack.

[Rick Morris]

I am sure you already saw this page, but if not here is a good link that discusses the stackwise issues you have shown here.

http://www.cisco.com/en/US/customer/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html#wp39183

There are some good steps to try as well as some good commands for verification.

[InayathUlla Sharieff]

Hi,

I Could see there are two images installed on two different stack and sorry to say that they are not pretty good IOS.

54    WS-C3750X-48P      15.0(1)SE3            C3750E-UNIVERSALK9-M   

1   52     WS-C3750-48TS      12.2(25)SEA             C3750-I9K91-M   

Hence action plan straight away would be to upgrade/downgrade the firmware to12.2(55)SE7 to avoid and get many problem resolved.

HTH

Regards

Inayath

[6tgreene]

Yes, I have seen that link you sent. I have tried all the suggerstions on the page

[Rick Morris]

Well, I am all tapped out.  The last thing I found was this link

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsj80738

Sounds like the logging notification is the same but maybe not the same scenario you are experiencing.