[c-nsp] NPE-G1 Interface errors / packetloss

[Alexander Fossa]

Hi Peter,

Thanks for the reply.

We have two interconnects from the NPE-G1 back to the SUP32

GI0/1 (npe) > Gi1/7 (sup32) - copper native on npe, to brand new cisco 1000-T SFP
GI0/3 (npe) > Gi1/4 (sup32) - fibre GBIC on npe, to brand new cisco SFP SX

The wierd thing is the CRC / Frame errors followed the VLAN when it was moved from the fibre to the copper. Both are direct patch cables nothing else... distance is about 3m on each.

Thanks,

Alex
________________________________________
From: Peter Rathlev [peter at rathlev.dk]
Sent: 29 September 2011 17:01
To: Alexander Fossa
Cc: cisco-nsp ‎[cisco-nsp at puck.nether.net]‎
Subject: Re: [c-nsp] NPE-G1 Interface errors / packetloss

On Thu, 2011-09-29 at 15:10 +0000, Alexander Fossa wrote:
> At first we thought it was a dirty fibre / failed SFP, both have been
> replaced but the problem continues.
...
> Show interface stats from SUP32
...
>   Full-duplex, 1000Mb/s, media type is T

Have you checked the copper cable used here? Or is there some kind of
media converter involved since you mention fibre?

>      160219198 packets input, 76742158873 bytes, 0 no buffer
>      Received 133662 broadcasts (133662 multicasts)
>      47 runts, 0 giants, 0 throttles
>      25065 input errors, 24986 CRC, 24939 frame, 0 overrun, 0 ignored
...
> As you can see lots of CRC & Frame errors the SUP32 side, and a few
> overruns on the NPE-G1 side.

Something is wrong with the physical path when you see CRC and frame
errors on a link running full duplex in both ends. I would take a good
look at the cable and any patch panels between them.

--
Peter



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