Stackmgr stack link change

[c.gierula]

Hello,

Two of my 3750 switches in a stack are logging a lot of stack linke changes. Is this due to a faulty cable/port? If I change the cable and it persists, what would be the next step?

Thank you

Chris

[amit-singh]

Chris,

Paste us the exact error message that you are getting. Let us do some search on the message and course of action.

HTH,

-amit singh

[dvanhoyweghen]

Hi Chris,

I have the same problem in 2 of 3750 switches which are connected via stackcables . I swap the stackcable between both switches , but the problem is not solved.What do You have done to solve this problem ??

Apr 16 13:57:20.978: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state DOWN

Apr 16 13:57:21.985: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state UP

Apr 16 13:57:29.778: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state DOWN

Apr 16 13:57:30.038: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state DOWN

Apr 16 13:57:30.784: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP

Apr 16 13:57:31.044: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state UP

Apr 16 13:57:48.912: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state DOWN

Apr 16 13:57:49.919: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP

Apr 16 13:57:54.197: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state DOWN

Apr 16 13:57:55.204: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state UP

Apr 16 14:04:52.972: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state DOWN

Apr 16 14:04:53.978: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state UP

Apr 16 14:04:54.742: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state DOWN

Apr 16 14:04:54.985: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state DOWN

Apr 16 14:04:55.991: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 5 has changed to state UP

Apr 16 14:04:56.763: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP

Apr 16 14:05:03.801: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state DOWN

Apr 16 14:05:05.814: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP

regards

Dirk

[c.gierula]

Per Cisco:

make sure there is no external pressure on the cables. Cabinet enclosure might be compressing the cable.

Make sure the cables are properly seated and secured.

Make sure you have the right length cables.

Check for proper grounding of rack/cabinet.

When powering the stack start with master then follow sequentially.

We have had limited sucess with this issue.

We have had instances where we have changed switches to resolve the issue.