We are observing issue with stack ports/cables on our Cisco 3750 switches.
Stack port keeps on flapping every second. Can anyone please advice anything.
Switch 1 WS-C3750G-48TS-S
Switch 2 WS-C3750G-48TS-S
Switch 3 WS-C3750G-24T-S
May 29 06:59:51.262 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
May 29 06:59:52.277 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
May 29 06:59:53.283 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
May 29 06:59:54.290 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
May 29 06:59:59.323 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
May 29 07:00:00.330 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
May 29 07:00:08.861 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state DOWN
May 29 07:00:08.870 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state UP
May 29 07:00:14.909 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state DOWN
May 29 07:00:14.935 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state UP
May 29 07:00:18.928 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state DOWN
May 29 07:00:18.936 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state UP
May 29 07:00:22.484 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
May 29 07:00:23.491 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
May 29 07:00:26.981 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state DOWN
May 29 07:00:26.989 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state UP
May 29 07:00:38.591 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
May 29 07:00:39.069 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state DOWN
May 29 07:00:39.077 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 3 has changed to state UP
May 29 07:00:39.597 IST: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
Indnoi-hcl-data-sw1#sh switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Down Ok
2 Ok Down
3 Ok Ok
Indnoi-hcl-data-sw1#sh switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Down Down
2 Ok Down
3 Ok Ok
