CAT 3850 IOS-XE many stack link change in log

[dmooreami]

WS-C3850-12X48U 16.09.06

Getting below errors.  Before changing out the stacking cable the up/down between the two switches would eventually drop the Access ports on the switch. how do I determine which switches stack port is bad? 

13:35:47.639: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is down
13:35:47.640: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is up
13:36:26.416: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is down
13:36:26.417: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is up
13:40:46.392: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is down
13:40:46.423: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is up
13:41:45.716: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is down
13:41:46.228: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is up
13:41:47.566: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is down
13:41:47.925: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is up
13:44:06.839: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is down
13:44:06.839: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is up
13:44:50.682: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is down
13:44:50.683: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is up

[Reza Sharifi]

13:35:47.640: %STACKMGR-6-STACK_LINK_CHANGE: Switch 1 R0/0: stack_mgr: Stack port 1 on Switch 1 is up
13:36:26.416: %STACKMGR-6-STACK_LINK_CHANGE: Switch 2 R0/0: stack_mgr: Stack port 2 on Switch 2 is down

Follow the cable from switch-1 port 1 to switch-2 port 2

Also, Issue the command below to make sure you are disconnecting the right cable.

sh switch stack-ports

HTH

[dmooreami]

show switch stack-ports summary gives more info.

If I disconnect the cable from 1/1 to 2/2 the up/down stops.

It's the port I just to know which switch. 

[Reza Sharifi]

Just follow the cable from switch-1 to switch-2. How many switches are in the stack?

HTH