[j-nsp] Link establishment issues with 1Gbps SX/LX SFPs on QFX5110

Shaffi Khan shaffi.khan at gigafy.co
Mon Jun 24 21:49:42 EDT 2019

Hi Tim

Can confirm I've seen exactly the same issue on QFX5110 18.4R1.8 with the only way I can get fs.com LX 1G transceivers working being turning off auto-neg.

Have also seen strange issues with 1G copper transceivers just not showing up in chassis hardware n some versions, and working fine in older versions.


-----Original Message-----
From: juniper-nsp <juniper-nsp-bounces at puck.nether.net> On Behalf Of Timothy Creswick
Sent: Tuesday, 25 June 2019 7:50 AM
To: 'juniper-nsp at puck.nether.net' <juniper-nsp at puck.nether.net>
Subject: [j-nsp] Link establishment issues with 1Gbps SX/LX SFPs on QFX5110

Hi All,

We've been battling with a number of issues getting 1G Base-X links to work on a batch of new QFX5110-48S switches, in use as Fusion devices connected to MX204.

No problems with a variety of 10G and 100G connections. A lot of 1G works fine but we seem to have issues with auto-negotiate with both SX and LX optics. JTAC are a bit lost and we've tried a variety of firmwares with varying success. Turning auto-negotiate off on both sides seems to fix most of this, but that's not viable in a lot of cases where there's a 3rd party involved.

Anyone seen similar and aware of a fix?


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