It was  Arista 7124SX switch with certain DA cables only. :) But we have not 
seen it on other switches.

Have you tried connecting the NIC to another link partner? And how about using 
different DA cables? (length or brand)

Also could you please send us copy of your NIC's eeprom: "ethtool -e ethX" ? 

Thanks,
Stephen

> -----Original Message-----
> From: Paweł Gołaszewski [mailto:bl...@gda.pl]
> Sent: Monday, November 12, 2012 11:50 AM
> To: Ko, Stephen S
> Cc: 'e1000-devel@lists.sourceforge.net'
> Subject: RE: [E1000-devel] ixgbe with X520-DA2 problem
> 
> Hello,
> 
> On Mon, 12 Nov 2012, Ko, Stephen S wrote:
> > When we saw a link flap/reset like this in the past, it was against a
> > certain switch vendor.
> 
> Which one? :)
> 
> > Which switch or link partner is this NIC connected to?
> 
> This is Juniper EX4500.
> 
> > Also, can you please provide us with following info? This will help us
> > debug your issue.
> >
> > dmesg
> 
> http://www.blues.gda.pl/dmesg.txt.gz
> 
> > ethtool -i ethX
> 
> # ethtool -i eth2
> driver: ixgbe
> version: 3.9.15-k
> firmware-version: 0x61c10001
> bus-info: 0000:07:00.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes
> supports-priv-flags: no
> 
> --
> pozdr.  Paweł Gołaszewski          jid:blues<at>jabber<dot>gda<dot>pl
> --------------------------------------------------------------------------
> If you think of MS-DOS as mono, and Windows as stereo, then Linux is Dolby
> Pro-Logic Surround Sound with Bass Boost and all the music is free.
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