[j-nsp] 40G QSFP problems on QFX5100 after 16.1R6

[Jared Mauch]

I’ve seen issues on QFX-5200 depending on the optics and cabling type.  We’ve had to set
FEC on the ports to none.  This may also be a problem with the QSFP/QSFP+ type optics.
The threshold was in going from 15.x -> 17.x, so it’s possible it showed up in 16.x as well.

- Jared

> On Apr 26, 2018, at 2:09 PM, Luca Salvatore via juniper-nsp <juniper-nsp at puck.nether.net> wrote:
> 
> Also experienced these issues with most versions above 14.1X53.
> FWIW I've had no problems with 17.3R2-S1.2, but we did have issues with
> 17.4R1
> 
> We're working with our account team to try and sort this stuff out
> 
> On Tue, Apr 24, 2018 at 8:21 AM Sebastian Wiesinger <sebastian at karotte.org>
> wrote:
> 
>> * Chris via juniper-nsp <juniper-nsp at puck.nether.net> [2018-04-24 09:58]:
>>> I can't keep switching firmware around to try and resolve this/isolate
>> to a
>>> specific revision, but it is interesting that you also note you have not
>>> experienced any issues with 16.1, the same as us. If you get a proper
>> answer
>>> to what this issue is I would really like to know, but it looks like I
>> will
>>> probably have to downgrade to 16.1 due to these issues as they are
>> impacting
>>> services.
>> 
>> Interesting stuff, I'm fishing around but I'm suspecting perhaps this
>> is some sort of timing issue. Just be aware that 16.1R6 is also a
>> "bad" version from our point of view. 16.1R5-S2 is fine.
>> 
>> Sebastian
>> 
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