We have a 3750x stack that keeps flapping, all hardware replaced [both switches and twice both stack cables]. Stack forms and appears to be fully operational. every hour or so the stack ports flap as below:
Cant find any bugs and TACs just suggesting to replace hardware 😞
Any one else experienced this and possibly knows any fixes?
Thanks
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Sep11 17:32:03.680: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
Sep 11 17:32:04.662: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP
Sep 11 18:07:01.411: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Sep 11 18:07:02.409: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Sep 11 18:37:41.410: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Sep 11 18:37:42.417: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 30 WS-C3750X-24 15.0(2)SE9 C3750E-UNIVERSALK9-M
2 30 WS-C3750X-24S 15.0(2)SE9 C3750E-UNIVERSALK9-M
#show switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 2 50 cm Yes Yes Yes 3956 No
1/2 OK 2 50 cm Yes Yes Yes 19 No
2/1 OK 1 50 cm Yes Yes Yes 3 No
2/2 OK 1 50 cm Yes Yes Yes 2076 No
#show switch stack-ring speed
Stack Ring Speed : 32G
Stack Ring Configuration: Full
Stack Ring Protocol : StackWisePlus
