Mailing List Archive

MX204 and QSFP+ breakouts
Dear list,

On a lark we picked up 4x10GbE breakouts for our MX204. Currently we've tried a couple different versions, a plain ol' passive DAC, and one that breaks out into 8 multimode fibers.

I see that QSFPP-4X10GE-SR is supported on MX204 since 17.4R1. We're running 19.4R3. *SHOULD* work, right?

With the appropriate configuration they come up and pass data. Great. But they flap every few minutes, and the PFE log is flooded with

MQSS(0): CHMAC1: Detected Ethernet MAC Local Fault Delta Event for Port 0 (xe-0/0/0:0)
MQSS(0): CHMAC1: Cleared Ethernet MAC Local Fault Delta Event for Port 0 (xe-0/0/0:0)

...for every single channel interface that's got link on it. The same happens with the DACs and AOCs.

Of course, these are all from FS, so firmware is the big question in my mind. These are Fiberstore QFX-QSFP-DACBO-2M and EX-QSFP-8LC-AOC5M. The MX CLI shows them as "QSFP+-40G-CU?M". These are switch-oriented part numbers, but I must admit this is my first foray into these things and in SFP+ land I haven't encountered any issues where an optic labelled "EX" doesn't just work in everything. We don't have an MX204 available to try random JUNOS loads on (yet) so I turn to the collective:

Do FS QSFP+ breakout DACs and AOCs work on this platform? Is there some magic sauce firmware I'm too daft to find?

(I've talked to JTAC, of course they blame the third-party transceiver)

Thanks

Ross
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Re: MX204 and QSFP+ breakouts [ In reply to ]
Once upon a time, Ross Halliday <ross.halliday@wtccommunications.ca> said:
> Do FS QSFP+ breakout DACs and AOCs work on this platform? Is there some magic sauce firmware I'm too daft to find?

I've got a couple of MX204s in service since they were released with
Fiberstore 4x10G optics (reported as QSFP-PLR4-40G in JUNOS). I haven't
had any trouble with any of them on 18.1 and 18.4 JUNOS. No magic sauce
in use as far as I know.

--
Chris Adams <cma@cmadams.net>
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Re: MX204 and QSFP+ breakouts [ In reply to ]
Hi,

On 30.04.2021 23:21, Ross Halliday wrote:
> Do FS QSFP+ breakout DACs and AOCs work on this platform? Is there some magic sauce firmware I'm too daft to find?


We had some troubles in 40G and 100G DACs on MX204 and MX10003. e.g. 40G
DAC worked in $old versions and suddenly stopped in $newer versions. It
seems it stopped working when 100G DAC support was officially
introduced/supported.

https://apps.juniper.net/hct/product/?prd=MX204
Officially they do not support 40G DAC (regardless of type), but 4x10G
SR or LR Breakouts are supported and do work in our LAB.

Sometimes it can make a difference whether or not the third party optics
are coded to the correct SKUs. So it may help to play around with
different codings, i think FS also offers a Box to change the programming?

Juniper has specific SKUs where they support the 4x10G Breakout (e.g.
QSFPP-4X10GE-LR and SFPP-4X10GE-SR), but so far Breakout also worked
fine on other parallel optical transceiver we tried.

regards
Tobias
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Re: MX204 and QSFP+ breakouts [ In reply to ]
Thanks to everyone who responded. I actually do have an FSbox lying around, and forgot it had a QSFP+/QSFP28 port! Chris, our modules obviously have different firmware, I'll see if I can get something from FS about this.

Thanks!

Ross


-----Original Message-----
From: juniper-nsp <juniper-nsp-bounces@puck.nether.net> On Behalf Of Chris Adams
Sent: April 30, 2021 6:50 PM
To: juniper-nsp@puck.nether.net
Subject: [EXTERNAL] Re: [j-nsp] MX204 and QSFP+ breakouts

Once upon a time, Ross Halliday <ross.halliday@wtccommunications.ca> said:
> Do FS QSFP+ breakout DACs and AOCs work on this platform? Is there some magic sauce firmware I'm too daft to find?

I've got a couple of MX204s in service since they were released with
Fiberstore 4x10G optics (reported as QSFP-PLR4-40G in JUNOS). I haven't
had any trouble with any of them on 18.1 and 18.4 JUNOS. No magic sauce
in use as far as I know.

--
Chris Adams <cma@cmadams.net>
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juniper-nsp mailing list juniper-nsp@puck.nether.net
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Re: MX204 and QSFP+ breakouts [ In reply to ]
On Fri, Apr 30, 2021 at 09:21:13PM +0000, Ross Halliday wrote:
> Do FS QSFP+ breakout DACs and AOCs work on this platform? Is there some magic sauce firmware I'm too daft to find?
>
> (I've talked to JTAC, of course they blame the third-party transceiver)

Did you try disabling auto-negotiation?

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