[j-nsp] QSA adapters and MTU

[Chris Wopat]

I can test this on our lab box, but cant get 'supported platform' in the
chassis config for

port 15 {
    ##
    ## Warning: statement ignored: unsupported platform (mx304)
    ##
    speed 1G;
}

even though it's passing on https://apps.juniper.net/port-checker/mx304/
 ¯\_(ツ)_/¯

could perhaps work harder on getting that config right later. it
certainly lets me commit a ge config with that MTU though. when set as
speed 10g, I can see the 1g optic inserted, as well as DOM, but it won't
link.

--Chris



On Fri, Nov 3, 2023 at 10:16 AM Ola Thoresen via juniper-nsp <
juniper-nsp at puck.nether.net> wrote:

> On 03.11.2023 16:04, Chris Wopat wrote:
>
> > We use them on MX304 at 10g, primarily to get DWDM SFP+ to work. MTU
> > is fine, it's 9k as a part of LACP on a recent deployment. The adapter
> > simply passes through lane :0 to the port when configured as QSFP+. If
> > you insert the adapter and no optic, the device is unaware of its
> > existence - you only see the SFP+ info.
> >
> This is the same use case as for us, and my understanding is exactly
> that they are just passing a single lane through, and should not really
> know anything about packets or ethernet frames or anything.
>
> But still - people more knowledgeable than me - assure me that there is
> a limit of 2008 Bytes MTU - at least for 1G.
>
> I just can't find this documented anywhere, and I would have thought
> that more people would have made more fuss about it when they start
> using it if this is a real issue.
>
>
> > We haven't tested in prod on 1g but i think we did in the lab. can
> > probably toss something in there if you're really curious. I think the
> > juniper supported optic page lists QSA adapter support or not. I
> > thought it was generally supported with Junos 20+ nowadays.
> >
> Yes. They list QSA adapter as supported, also for 1G optics, and don't
> write anything about any MTU limitations in the Hardware Compatibility
> Tool.
>
>
> /Ola (T)
>
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