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Date:      Thu, 13 Jan 2011 20:49:55 +0100 (CET)
From:      sthaug@nethelp.no
To:        rysto32@gmail.com
Cc:        freebsd-net@freebsd.org
Subject:   Re: Intel 10GBase-LR Ethernet card detected as 10GBase-SR
Message-ID:  <20110113.204955.41688285.sthaug@nethelp.no>
In-Reply-To: <20110113.195806.74699536.sthaug@nethelp.no>
References:  <20110113.151652.104127547.sthaug@nethelp.no> <AANLkTim0VSQ-XnT=0_GFWRE8nVepczzNDtnM1e_m2Vur@mail.gmail.com> <20110113.195806.74699536.sthaug@nethelp.no>

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> > If it has an SFP+, won't the it be LR or SR depending on the type of
> > SFP+ installed?
> 
> The card is *sold* and *advertised* by Intel as a 10GBase-LR card. It
> may well be the case that it would also work with a 10GBase-SR SFP+.
> I don't have one of these lying around to test, unfortunately. But I
> have indeed verified that the SFP+ in the card is a 1310 nm 10GBase-LR
> unit (specifically it's a Finisar FTLX1471D3BCV).
> 
> As such, I believe the ixgbe code should either set the card type as
> 10GBase-LR (statically), since that's how the card is sold/delivered.
> Or it should include code to read the optics type from the SFP+.

Thinking about this some more - I see there are also SR variants of the
same card:

  http://ark.intel.com/Product.aspx?id=39773
  http://ark.intel.com/Product.aspx?id=39774

In which case reading the optics type from the SFP, or having some kind
of config setting, is the only thing that makes sense IMHO.

Having a 10GBase-LR card report 10GBase-SR is guaranteed to result in
misunderstandings...

Steinar Haug, Nethelp consulting, sthaug@nethelp.no



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