Hello, we've noticed problems with third party vendors QSFP 40G optics after upgrading our JunOS on QFX5100. The problems manifest as a general instablility on the QSFP links with symptoms like:
* Links take minutes to come up * Links go down randomly * Links show CRC/Align errors and packets get dropped Further testing revealed that this is happening with 16.1R6 and higher trains (tested 17.4 and 18.1). After downgrading to 16.1R5-S2 the problems are gone IF you also downgrade the host OS (force-host option). Only downgrading the JunOS VM does not work. Looking through release notes I noticed that PR1296011 got fixed in 16.1R6 and subsequent release trains. It reads: On QFX5100 platform, 40G interface might not come up if specific vendor direct attach copper (DAC) cable is used (eg: Molex cable 3m). I wonder if some change for this PR caused these problems? Doe anyone have the same problems and maybe already successfully communicated this to Juniper? I have a case open right now but I'm not sure I'm getting somewhere. So in conclusion be wary about upgrading beyond 16.1R5-S2 when using third party optics... Regards Sebastian -- GPG Key: 0x93A0B9CE (F4F6 B1A3 866B 26E9 450A 9D82 58A2 D94A 93A0 B9CE) 'Are you Death?' ... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE. -- Terry Pratchett, The Fifth Elephant _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp