100G, input errors and/or transceiver issues

Jared Mauch jared at puck.nether.net
Mon Jul 19 17:58:02 UTC 2021


> On Jul 19, 2021, at 1:50 PM, Saku Ytti <saku at ytti.fi> wrote:
> 
> On Mon, 19 Jul 2021 at 20:19, Graham Johnston
> <johnston.grahamj at gmail.com> wrote:
> 
>> I don't at this point have long term data collection compiled for the issues that we've faced. That said, we have two 100G transport links that have a regular background level of input errors at ranges that hover between 0.00055 to 0.00383 PPS on one link, and none to 0.00135 PPS (that jumped to 0.03943 PPS over the weekend). The range is often directionally associated rather than variable
> 
> On typical 100G link we do not get single FCS error in a typical day.
> However Ethernet spec still allows very high error rate of 10**-12. So
> 1 error per 1Tb (b not B). I.e. 1 error per 10s, or 0.1PPS would be
> in-spec. We see much better performance to this and vendors generally
> accept lower error rates as legitimate errors.
> 

I will confirm my experience with this at $dayjob as well.  We see interfaces with no errors over much longer periods of time inclusive of several of the technology options.  If you are seeing errors, there’s likely something wrong like unclean fiber or bad optic/linecard etc.

- Jared



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