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Two HP Switches configuration issue

Alright, I have two HP ProCurve 4000Ms that are strung together with a fiber cable and a fiber module at each end. One end runs flawlessly with no errors problems, the other one reports excessive CRC issues in intervals of about every ten minutes or so. My question is this: Should I start checking to see if the fiber is okay, or is the fact the error is being reported on only one switch mean it could be a NIC isolated to that switch?
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kittensizedbulldozer
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kittensizedbulldozer
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2 Solutions
 
AutoSpongeCommented:
Are you using multimode cable?  If so, do you have a patch cable at each end of the run?

Check page 30 of the install docs

http://www.hp.com/rnd/pdfs/59903069.pdf
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AutoSpongeCommented:
And make sure both ends are hard-coded for the same speed and duplex.
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grbladesCommented:
Hi kittensizedbulldozer,
With fibre connections each direction is completely isolated from each other. Lots of CRC errors at one end could be the result of misconfiguration, faulty transmitter, faulty cable, or a faulty receiver.

I suggest you check the configuration and then try swapping the fibre modules over to see if the fault stays with one end of the fibre or one particular module.
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kittensizedbulldozerAuthor Commented:
That's a good idea swapping the fiber module, thanks grblades.

Things took an interesting little wrinkle today. The switch in our east closet now reports the "Lost Connection to Multiple devices" error about every minute or so, but the network's up. It's like it loses the signal very briefly about every minute or so. If I ping it over the course of an hour, I lose about 5 - 7% of my packets. I still wonder if the cable may have gotten kinked somehow, since the people we subcontracted to install it didn't know what they were doing and install the wrong ends about four times before they got it right. :)
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kittensizedbulldozerAuthor Commented:
Also, what's even odder to me is only one switch reports that "Lost Connection to Multiple Devices" error. Usually, if you disconnect the link completely, both HP switches report that error. Another thing I forgot to mention, on one end of the fiber cable there's a set of adapters in use, because they never DID install the right end onto the core cable.
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grbladesCommented:
What connectors are on the ends of the fibre?
If it is SC then you can normally unclip the fibres from each other and swap them over. If you do this at both ends and then the other switch starts reporting the problem you know it is a fibre problem.
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kittensizedbulldozerAuthor Commented:
Okay, it ended up, of course, being the adapters on one of the ends of the cable. I swear, it's tough to find anyone who can install this stuff correctly...
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grbladesCommented:
Glad it is now working.

When you buy fibre cables you normally get a piece of paper with them saying what the loss is down the cable. When having fibre installed I would ask for the same report done 'end to end'. If they can's supply the report then they cannot say the cable will work correctly so choose someone else.
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