[j-nsp] QSA adapters and MTU

[Aaron1]

I recall the MX204 being like that… an XE interface with a 1g speed command on the interface 

Aaron

> On Nov 3, 2023, at 11:00 AM, Olivier Benghozi via juniper-nsp <juniper-nsp at puck.nether.net> wrote:
> 
> Actually 1G ports are «10G ports operating at 1G speed».
> So, configured as 10G ports on chassis side, giga-ether speed 1G on
> interface side.
> 
>> Le ven. 3 nov. 2023 à 16:53, Chris Wopat via juniper-nsp <
>> juniper-nsp at puck.nether.net> a écrit :
>> 
>> 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.
>>> 
>> 
> 
> -- 
> *Ce message et toutes les pièces jointes (ci-après le "message") sont 
> établis à l’intention exclusive des destinataires désignés. Il contient des 
> informations confidentielles et pouvant être protégé par le secret 
> professionnel. Si vous recevez ce message par erreur, merci d'en avertir 
> immédiatement l'expéditeur et de détruire le message. Toute utilisation de 
> ce message non conforme à sa destination, toute diffusion ou toute 
> publication, totale ou partielle, est interdite, sauf autorisation expresse 
> de l'émetteur*
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp