Re: 400G forwarding - how does it work?

[Jeff Tantsura]

Apologies for garbage/HTMLed email, not sure what happened (thanks
Brian F for letting me know).
Anyway, the podcast with Juniper (mostly around Trio/Express) has been
broadcasted today and is available at
https://www.youtube.com/watch?v=1he8GjDBq9g
Next in the pipeline are:
Cisco SiliconOne
Broadcom DNX (Jericho/Qumran/Ramon)
For both - the guests are main architects of the silicon

Enjoy


On Wed, Aug 3, 2022 at 5:06 PM Jeff Tantsura <jefftant.i...@gmail.com> wrote:
>
> Hey,
>
>
>
> This is not an advertisement but an attempt to help folks to better 
> understand networking HW.
>
>
>
> Some of you might know (and love 😊) “between 0x2 nerds” podcast Jeff Doyle 
> and I have been hosting for a couple of years.
>
>
>
> Following up the discussion we have decided to dedicate a number of upcoming 
> podcasts to networking HW, the topic where more information and better 
> education is very much needed (no, you won’t have to sign NDA before joining 
> 😊), we have lined up a number of great guests, people who design and build 
> ASICs and can talk firsthand about evolution of networking HW, complexity of 
> the process, differences between fixed and programmable pipelines, memories 
> and databases. This Thursday (08/04) at 11:00PST we are joined by one and 
> only Sharada Yeluri - Sr. Director ASIC at Juniper. Other vendors will be 
> joining in the later episodes, usual rules apply – no marketing, no BS.
>
> More to come, stay tuned.
>
> Live feed: https://lnkd.in/gk2x2ezZ
>
> Between 0x2 nerds playlist, videos will be published to: 
> https://www.youtube.com/playlist?list=PLMYH1xDLIabuZCr1Yeoo39enogPA2yJB7
>
>
>
> Cheers,
>
> Jeff
>
>
>
> From: James Bensley
> Sent: Wednesday, July 27, 2022 12:53 PM
> To: Lawrence Wobker; NANOG
> Subject: Re: 400G forwarding - how does it work?
>
>
>
> On Tue, 26 Jul 2022 at 21:39, Lawrence Wobker <ljwob...@gmail.com> wrote:
>
> > So if this pipeline can do 1.25 billion PPS and I want to be able to 
> > forward 10BPPS, I can build a chip that has 8 of these pipelines and get my 
> > performance target that way.  I could also build a "pipeline" that 
> > processes multiple packets per clock, if I have one that does 2 
> > packets/clock then I only need 4 of said pipelines... and so on and so 
> > forth.
>
>
>
> Thanks for the response Lawrence.
>
>
>
> The Broadcom BCM16K KBP has a clock speed of 1.2Ghz, so I expect the
>
> J2 to have something similar (as someone already mentioned, most chips
>
> I've seen are in the 1-1.5Ghz range), so in this case "only" 2
>
> pipelines would be needed to maintain the headline 2Bpps rate of the
>
> J2, or even just 1 if they have managed to squeeze out two packets per
>
> cycle through parallelisation within the pipeline.
>
>
>
> Cheers,
>
> James.
>
>