Cheap switch with a couple 100G
ben at 6by7.net
Sun Nov 25 18:37:03 UTC 2018
That’s because the DWDM solutions (at least the good ones, wisely) use single-wavelength 100Ghz coherent light (like, you know, normal optics from the rest of history), and do not play this 4x25g lane splitting game. Unfortunately they are still quite expensive and physically large, smallest I know of right now is in CFP2.
- Ben Cannon, AS15206
> On Nov 25, 2018, at 10:16 AM, Mike Hammett <nanog at ics-il.net> wrote:
> I haven't seen anyone selling 25G or 50G transport.
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com <http://www.ics-il.com/>
> http://www.midwest-ix.com <http://www.midwest-ix.com/>
> From: "Saku Ytti" <saku at ytti.fi>
> To: "Mike Hammett" <nanog at ics-il.net>
> Cc: nanog at nanog.org
> Sent: Sunday, November 25, 2018 9:45:58 AM
> Subject: Re: Cheap switch with a couple 100G
> The argument should be 50G is cheaper than 40G.
> Because serdes is 25G typically, you get 25, 50, 100 without gearboxes
> and retimers, so less pincount, less thermal, higher density, lower
> But BOM impact to pricing isn't high anyhow, unless we're talking
> about massive port counts.
> If box DOES support 10GE and 40GE then the cost benefit is not there,
> so you need to be targeting quite specific use case, use-case large
> scale DCs are targeting.
> On Sun, 25 Nov 2018 at 16:42, Mike Hammett <nanog at ics-il.net> wrote:
> > I keep hearing how cheap 100G is compared to 40G and it doesn't seem to hold true. Prove me wrong.
> > Cisco Nexus and Arista both have switches with 48x 10G ports and 2x - 6x 40G ports for under $1k. Swap those 40G for 100G and you're at $5k - $7k.
> > Am I missing some cheap switches with 100G?
> > I ask this because the transport companies seem to have given up on 40G.
> > -----
> > Mike Hammett
> > Intelligent Computing Solutions
> > http://www.ics-il.com
> > Midwest-IX
> > http://www.midwest-ix.com
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