9300 Stack issue

[MHM Cisco World]

Hi 

we have four 9300L connect as stack, all switch have 17.15.5 IOS XE 
when I connect switchs we face high CRC and stack port up/down in switch/s 

there is issue in HW or image we use ?

and if it HW 
how can port and cable is damage in same time ?

[aleabrahao]

CRC means L1 issue, it's probably cable or port issue.

[Leo Laohoo]

Inspect the stacking cable.  Is the "Cisco" logo of each end pointing UP or down?

Are the s_crews of the stacking cables finger tight or not?

[MHM Cisco World]

Hi Leo 

Yes as I inform you the Cisco Logo up and screws tight 

image 17.15.5 
boot loader 17.12.x <<- does this need to upgrade also 

and we do inspection connect good stack cable into port the issue still same ?

this 9300L so there is no removable Stack adapter

I afraid one of our engineer mistakenly damage the cable and port   

your input Mr.Leo

[Leo Laohoo]

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@MHM Cisco World wrote:
I afraid one of our engineer mistakenly damage the cable and port   

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RMA the switch and the cable.

[MHM Cisco World]

did you see same issue before in such port and cable damage ?

[balaji.bandi]

High CRC  on the Stack cable, can you post output of the Below :

show switch stack-ports detail

(most of my observation,. Cable was not intact, could be port issue)  - make sure cables are Tight as suggested.

[MHM Cisco World]

Sure I will attach the output 

the cable is tight very good 

but as I mention I afraid our engineer by mistake damage the port, can that happened ? 

please note that the cisco logo is UP we so so sure about this point before insert stack cable into port

[balaji.bandi]

but as I mention I afraid our engineer by mistake damage the port, can that happened ? 

yes wrong pushing also damage the cables, and board also.

If you get maintenance, turn off whole switch and reseat cables and check one more time , bring back and monitor.

If you have still issue, then RMA.

[MHM Cisco World]

please find attachment 

[aleabrahao]

@MHM Cisco World A very basic question, have you tried swapping the stacking cable, or at least tried to identify which one might be defective (assuming the problem is actually the stacking cable)?

[balaji.bandi]

3rd switch looks like it has an issue. If you clear the counters and they increase quickly, please try the maintenance window and follow the suggestion mentioned earlier. Still, issue TAC and RAM