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06.19.2007 at 02:49AM PDT, ID: 22642655
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"Excessive CRC/Alignment Errors" on HP ProCurve 2810-48G

Tags: excessive, errors, crc, procurve
We recently installed a ProCurve 2810-48G switch - it's pretty much on default settings, here's the config:

; J9022A Configuration Editor; Created on release #N.10.02

hostname "ProCurve Switch 2810-48G"
snmp-server community "public" Unrestricted
vlan 1
   name "DEFAULT_VLAN"
   untagged 1-48
   ip address dhcp-bootp
   exit

We're using 47 of the 49 ports at a mixture of 100Mb and 1Gb speeds.  "Log Network Problems" is set to medium sensitivity.

The switch is showing a number of errors in the alert log. Six ports (always the same ones) show "Excessive CRC / Alignment errors" intermittently, including, but not limited to, times when the PC on that port was booted up.  The ports with errors are all connected to PCs with gigabit NICs, of a couple of different types, running XP Pro.

Also we have two ports showing "Excessive Broadcasts" - one of these is a server that was rebooted at the time of the event being logged, the other is a PC running Vista 64-bit.

Cabling and patch leads are all CAT5e, although it's not been certified by means of a Fluke or other device - only by a continuity tester (i.e. we know all pairs are correctly wired for each cable, but that is all).

Is this anything to worry about?  Does it even need addressing, as everything appears to work correctly?

Thanks in advance for any help.
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Question Stats
Zone: Computer Hardware
Question Asked By: DavidOHaycox
Solution Provided By: calvinetter
Participating Experts: 2
Solution Grade: B
Views: 204
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06.19.2007 at 06:28AM PDT, ID: 19315593

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06.19.2007 at 08:50AM PDT, ID: 19317023

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06.20.2007 at 09:22AM PDT, ID: 19325970

Rank: Guru

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06.25.2007 at 04:35AM PDT, ID: 19354758

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06.25.2007 at 06:03AM PDT, ID: 19355198

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07.23.2007 at 06:45AM PDT, ID: 19547288

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06.19.2007 at 06:28AM PDT, ID: 19315593
 If you're getting a lot of CRC errors, then could be 1 of the following:
- duplex mismatch between PC & switch
- bad cable (especially check crimped ends on self-made cables)
- bad NIC or just needs driver update
- bad switchport

Duplex mismatch happens when 1 device is manually set to full-duplex & the other device is set to 'auto' (auto-negotiate).  To avoid speed/duplex mismatches:  both devices set to 'auto' for duplex & speed, or both set manually to full-duplex & specific speed.
  If you suspect cables, also check if they're physically damaged, pinched, sharply-bent, or near a possible source of noise/interference (power lines, flourescent lights, etc).
  Most likely is a duplex mismatch or NICs that need a driver update.  Sometimes 2 different devices, even if both set to 'auto' won't properly negotiate (ie, you'll see CRC errors, etc).  If so, you'll want to set both manually to same speed/duplex.

cheers
Accepted Solution
 
06.19.2007 at 08:50AM PDT, ID: 19317023
All ports are set to auto at both ends.  Tried setting it manually on a PC - sure enough, more CRC errors, but the switch also reports "Duplex Mismatch" - which it doesn't do the rest of the time, so that can't be it.

Cables I will check, perhaps swap some ports around to see if the problem stays with PC or cable.

Driver updates - pretty sure already ok, but will double-check again.

Switchport - well, interestingly enough the ports affected are all odd (top row): 9,13,17, 23,29,31,39,47 - so will swap some round to rule this out.
 
06.20.2007 at 09:22AM PDT, ID: 19325970

Rank: Guru

If they're all odd, maybe your switch is bad - perhaps bad ASIC?  Moving cables around between odds and evens might rule this out.
 
06.25.2007 at 04:35AM PDT, ID: 19354758
Turned the fault detection up to high sensitivity and rebooted the switch at the end of the day on the 20th June.  Only 3 instances of CRC/alignment errors since, on two ports that hadn't shown errors before.

I also spotted that some of our old patch leads are CAT5, not CAT5E, so I'll be replacing those as a matter of course.

For the moment though, it looks like a simple reboot helped, if not cured the problem.  I wouldn't have expected that from a quality switch like this though.
 
06.25.2007 at 06:03AM PDT, ID: 19355198
Thanks for the update.   I'd watch the error counters on those 2 ports, & a couple of  those top row ports, see if the errors start increasing again.  If they do increase, hopefully you can find a pattern to the behavior.

cheers
 
07.23.2007 at 06:45AM PDT, ID: 19547288
The CRC / Alignment errors have pretty much gone after a reboot of the switch - only happened twice in the last month.

Still get the occasional (maybe 15 times this month) "Excessive broadcasts", but all from the same few hosts so pretty sure that's normal for what they're doing (we had an IP phone plugged in for testing, for example).

calvinetter gets the points for his very useful pointers.
 
 
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