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3750x Stack cables coming loose

I have just finished a project replacing 42 - 4006 with approx 200 - 3750X at one of my customer sites, two weeks ago I got an alarm from a monitoring tool that one of the stack ports on a specific switch was down, as I was on site and down the hall from this stack I walked over and found that the stack cable was loose. I did not think anything of the loose cable just figured we did not tighten it up properly so I screwed it in and all was fine. A few days later I got an alarm for a different switch on the other side of the campus, same thing, loose cable and just tightened it up. This week I was doing a safety walkthrough on all the closets and I decided to check the cables on many of the higher profile stacks and I found that the stacking cables were loose, in many cases I had 3-4 full revolutions to get the screws finger tight. I can see that my team may have missed a couple of screws but not the number I am finding. I was wondering what is best practice for tighten these screws and preventing them from loosening up? I don't want to go through all 42 rooms monthly and keep these screws tight, any suggestions?

3 REPLIES
Hall of Fame Super Gold

3750x Stack cables coming loose

Brian,

When it comes to the 3750 fleet, my toolbox have a flathead s_crew driver.  It has been awhile since I've used my fingers to install and tighten the cables.  I always use the s_crew driver or a 150mm drillbit.

And I have never experienced anything like this. 

Purple

Re: 3750x Stack cables coming loose

  Use a flatblade screwdriver to tighten.  Just has to be snug, "DO NOT OVERTIGHTEN", you will strip the screws .

Hall of Fame Super Silver

3750x Stack cables coming loose

Yes I've seen installers unfamiliar with the Stackwise cables finger tighten these only to have them loosen and cause a switch loss or degradation.

They need to be tightened with a tool (but not too much as Glen noted).

The new 3850 (and 3650) switches have a much improved form factor in their stack cables that doesn't appear so prone to coming loose and is not as fragile. Nice picture here:

http://blog.ciscoinferno.net/cisco-3850-stackwise

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