Arista unqualified SFP

Mike Hammett nanog at
Thu Aug 18 12:41:47 UTC 2016

Intel does allow DAC of any vendor (assuming they properly identify as DACs. You can also disable Intel's check in the Linux drivers. 

Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 

----- Original Message -----

From: "Mikael Abrahamsson" <swmike at> 
To: "Mark Tinka" <mark.tinka at> 
Cc: "nanog list" <nanog at> 
Sent: Thursday, August 18, 2016 7:32:55 AM 
Subject: Re: Arista unqualified SFP 

On Thu, 18 Aug 2016, Mark Tinka wrote: 

> All other vendors, explicitly or silently, adopt the same approach. 

I've heard from people running Intel NICs and HP switches, that this can't 
be turned off there. You run into very interesting problems when you're 
trying to use DAC cables between multi vendor. 

Any pointers to how to turn this of on Intel NICs and HP switches? 

Mikael Abrahamsson email: swmike at 

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