400G forwarding - how does it work?

Thu Aug 4 23:14:49 UTC 2022

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.ietf at gmail.com> wrote:
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> Hey,
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> This is not an advertisement but an attempt to help folks to better understand networking HW.
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> Some of you might know (and love 😊) “between 0x2 nerds” podcast Jeff Doyle and I have been hosting for a couple of years.
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> 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.
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> More to come, stay tuned.
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> Live feed: https://lnkd.in/gk2x2ezZ
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> Between 0x2 nerds playlist, videos will be published to: https://www.youtube.com/playlist?list=PLMYH1xDLIabuZCr1Yeoo39enogPA2yJB7
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> Cheers,
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> Jeff
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> From: James Bensley
> Sent: Wednesday, July 27, 2022 12:53 PM
> To: Lawrence Wobker; NANOG
> Subject: Re: 400G forwarding - how does it work?
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> On Tue, 26 Jul 2022 at 21:39, Lawrence Wobker <ljwobker at gmail.com> wrote:
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> > 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.
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> Thanks for the response Lawrence.
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> The Broadcom BCM16K KBP has a clock speed of 1.2Ghz, so I expect the
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> J2 to have something similar (as someone already mentioned, most chips
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> I've seen are in the 1-1.5Ghz range), so in this case "only" 2
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> pipelines would be needed to maintain the headline 2Bpps rate of the
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> J2, or even just 1 if they have managed to squeeze out two packets per
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> cycle through parallelisation within the pipeline.
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> Cheers,
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> James.
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