On Sun, Mar 22, 2020 at 05:11:20PM -0400, Dan Langille wrote:
> On Sun, Mar 22, 2020, at 4:43 PM, sth...@nethelp.no wrote:
> > > Partial success.  The card is now able to use an SFP+ optic.  It warns me
> > > when the optic is installed:
> > > 
> > > Mar 22 16:49:45 r720-01 kernel: WARNING: Intel (R) Network Connections 
> > > are quality tested using Intel (R) Ethernet Optics. Using untested 
> > > modules is not supported and may cause unstable operation or damage to 
> > > the module or the adapter. Intel Corporation is not responsible for any 
> > > harm caused by using untested modules.
> > > 
> > > I cannot use an SFP+ optic at the switch.  The connection just does not 
> > > happen.
> > > 
> > > If I go back to the original SFP optic, the connection occurs, as 
> > > expected at 1G.
> > > 
> > > On the switch side, I've tried a known good optic from an existing 
> > > connection.
> > > 
> > > I could install an PRO/10GbE instead, that has a built-in transceiver. I 
> > > have
> > > two of those in use now, both working on 10G.
> > 
> > Have you tried connected it to something other than the Unifi switch?
> 
> The only SFP+ capable switches I have are Unifi.
> 
> I just tried the other switch (US-48) which had one SFP+ port free.  Same 
> issues there.

Did the Unifi switch see the SFP+ optics on the switch end?

What happens if you take the SFP+ module from the server and put it in the
other Unifi switch and try establishing a link between the two switches?

Gary
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