stack port issue

[prabhu446]

                   Hello Guys,

We have a stack switches connected with stack cables and the cable between swt2 and swt3 has been replaced since we are getting too many errors in bold below.

atukrea-sw11#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        3        No
  1/2     OK         3      50 cm     Yes    Yes    Yes        2        No
  2/1     OK         3      50 cm     Yes    Yes    Yes    60989        No
  2/2     OK         1      50 cm     Yes    Yes    Yes        2        No
  3/1     OK         1      50 cm     Yes    Yes    Yes        1        No
  3/2     OK         2      50 cm     Yes    Yes    Yes    61001        No

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        3        No
  1/2     OK         3      50 cm     Yes    Yes    Yes        2        No
  2/1     OK         3      50 cm     Yes    Yes    Yes    60991        No
  2/2     OK         1      50 cm     Yes    Yes    Yes        2        No
  3/1     OK         1      50 cm     Yes    Yes    Yes        1        No
  3/2     OK         2      50 cm     Yes    Yes    Yes   61003        No

after replacing the cable too we had the same problem, so real question is do stack ports affect other stack ports i.e i have no idea which port between went bad and we need to test it, the swts are connected in this way. If the stack ports affect each other then we need to replace only one swt if not we need to replace two switches.

 

So real questions does stack ports affect each other or not.

[Gabriel Hill]

I think it's safe to say that stackports can affect each other. Ive seen cases where this has happened. . Your testing solution should clarify which stacked port is bad on either SWT2 or SWT3.

[prabhu446]

Thank you Gabriel for the reply. I understand that but we are in a situation where we are sure that we need to replace the switch it might be one if the stack ports affect each other, replace 2 switches if the ports does not affect each other. The point is it takes time to test since this causes outage and the contact is in UK so scheduling takes time. So if i get the absolute answer for my question then there is no need for testing. I hope you got the point

Thank you once again for replying.

[falconeddy]

What ios version are you running? There is a stack bug in version 12.2(53)SE2 that causes the stack ports to flap. The bug is fixed in 12.2(55)SE4 and higher

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[prabhu446]

Hello Aaron,

Thank you for the reply. The IOS version what i have is Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(50)SE.

What about this version . Can you please provide me a link for the document which says so, so that i can see for myself about the version that i have currently and also would be alearning process for me too.

Thank you once again.

[falconeddy]

The bugid is cscth67625
Should be able to see the info from the cisco bug tool with the bugid#

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