It depends on the spec of the XFP module, as well as the cabling. The spec of 
both types of modules needs to match. I asked the OP to test B2B to eliminate 
the XFP as the problem.  If you have any suggestions, I'd be happy to hear 
them. 

Jeff

-----Original Message-----
From: sth...@nethelp.no [mailto:sth...@nethelp.no] 
Sent: Wednesday, July 02, 2014 10:08 AM
To: Pieper, Jeffrey E
Cc: gon...@bsdinfo.com.br; freebsd-net@freebsd.org
Subject: Re: Network Intel X520-SR2 stopping

> Is there any way that you can try a reproduce this  using a B2B 
> configuration, or something that doesn't use XFP as a link partner? I'm 
> thinking that you are correct regarding an incompatibility issue between SFP+ 
> and XFP.

Why do you believe that? The optical signals are the same for SFP+
and XFP.

We have lots of 10G SFP+ / XFP links in production. It just works...

Steinar Haug, Nethelp consulting, sth...@nethelp.no
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