[j-nsp] QSFP28 oddities between Arista and QFX after upgrade

[Tim Jackson]

Check FEC settings. Try turning FEC on or off on both sides.

Arista: (config-if)#error-correction encoding reed-solomon

Juniper: set interfaces et-0/0/1 gigether-options fec fec91

On Sat, May 11, 2019, 6:32 AM Jason Lixfeld <jason-jnsp at lixfeld.ca> wrote:

> I had no idea auto-negotiation was still a thing with 100G, but in any
> event, toggling auto negotiation didn’t work.
>
> > On May 11, 2019, at 2:21 AM, Eric Krichbaum <eric at telic.us> wrote:
> >
> > I had a similar issue with 18.x and MX204. Did you try turning off
> auto-negotiation?
> >
> > set interfaces et-4/0/52 ether-options no-auto-negotiation
> >
> > I had a similar issue with QFX5100/EX4300 and 40G and this fixed the
> issue oddly enough.
> >
> > Eric
> >
> > -----Original Message-----
> > From: juniper-nsp <juniper-nsp-bounces at puck.nether.net> On Behalf Of
> Jason Lixfeld
> > Sent: Friday, May 10, 2019 6:13 PM
> > To: juniper-nsp <juniper-nsp at puck.nether.net>
> > Subject: [j-nsp] QSFP28 oddities between Arista and QFX after upgrade
> >
> > Hey,
> >
> > I have a QFX5110 in the lab which I upgraded from 17.something to 18.4
> to resolve some ISIS weirdness.  ISIS weirdness resolved, but now the
> previously working link between this QFX and an Arista 7280SR no longer
> comes up, despite light levels on both sides being within norms.  I went
> from 18.4 to 19.1 just for the hell of it, and still no bueno.
> >
> > The QSFP28 in the QFX comes up if it’s looped to itself, as does the
> QSFP28 in the Arista.  The Arista QSFP28 links to another Arista, or an
> MX204.  The QFX QSFP28 links to the same MX204 as well (no other QSFP28
> gear to test with otherwise) so it seems to be a weird compatibility issue
> between the Arista and the QFX?
> >
> > Does this sort of thing smell familiar to anyone?  I’ve had pretty good
> luck with 100G compatibility in general so far, so I’m not overly familiar
> with any knobs to work around any compatibility issues that may creep up
> here or there, so happily accept some pointers if anyone has some clue.
> >
> > Thanks!
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