Cisco 3750 switch stack-port 2 is bouncing

[Steve Coady]

Hello

I am getting the following messages.

Does this mean the cable needs to be replaced?

The problem appears to be on the 2nd switch in the stack. Can someone advise on the procedure

to fix this issue and will there be an outage of any kind during the replacement?

#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok   
    2           Ok          Down  
    3           Ok           Ok   
    4           Ok           Ok   

Oct 16 09:51:51: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Oct 16 09:51:53: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Oct 16 09:51:55: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
Oct 16 09:51:56: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP
Oct 16 09:51:56: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Oct 16 09:51:58: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Oct 16 09:52:01: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Oct 16 09:52:03: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Oct 16 09:52:05: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
Oct 16 09:52:05: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
  

[Rajeev Sharma]

Hey,

It could be either port or cable. Try replacing the stack cable with a good known one.

HTH.

Regards,

RS.

[Steve Coady]

rajeevsh

Can a stacking cable on the 2nd switch of 4 being removed "hot swappable"?

What adverse reactions could occur?

[glen.grant]

Sometimes you have to take a screwdriver to the stackcables to tighten them correctly, just don't heave on them and strip the screws. snug only... If it still happens replace cable and try again.