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Stack 3x3750 is crashing every few hours

Hi there,

I am having a strange issue with the stack on standard 3750 switches (not -E). Most of the time the stack seems to be unstable as logs below are saying, up to a point when it restarts itself. I have tried different cables and different code, running the latest one now, no difference at all... From Cisco website they are saying it is rather a hardware issue?

switch01#show switch
Switch/Stack Mac Address : m
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master mac1     15     0       Ready              
2       Member mac2     14     0       Ready              
3       Member mac3     1      0       Ready             

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1          Down          Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1          Down          Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok          Down

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok    

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3        None          None

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1        None          None
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1        None          None
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3        None          None

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3        None          None

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1        None          None
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1        None          None
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2        None          None
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2            None

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#show switch neighbors
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         3             2 
      2         1             3 
      3         2             1

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1          Down          Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1          Down          Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

switch01#sh switch stack-ports
  Switch #    Port 1       Port 2
  --------    ------       ------
    1           Ok           Ok  
    2           Ok           Ok  
    3           Ok           Ok 

1 REPLY
Hall of Fame Super Gold

Re: Stack 3x3750 is crashing every few hours

Can you provide more information?

1.  What IOS are you running?
2.  If stack keeps crashing, can you post the crashinfo?
3.  Can you check that remaining flash memory?  The stack could be doing a boot-crash-loop.  It crashed, boot and since there's no more remaining flash memory crash again.

If it is doing a boot-crash-loop, power down the entire stack for about 15 seconds and power up the stack one-at-a-time starting with the stack master.

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