Cheap switch with a couple 100G

Mike Hammett nanog at
Sun Nov 25 21:31:49 UTC 2018

Used Cisco Nexus 93180YC (oh, I guess New, sorry, it was on eBay, so I assumed used) is about $6,500, though I've heard they go down to $4k from time to time. 

So then maybe that's the problem... not enough used 100G gear out there yet to make it affordable... leaving 40G as the biggest cost-effective option. Most people I know don't buy that kind of gear new, only used. It costs too much, otherwise. 

>From what I've gathered from active DWDM platform vendors, it doesn't matter what you throw at it (up to the latest and greatest), they just eat it up (assuming you have the right line cards). Maybe it only works that way when talking to sales\marketing? 

Mike Hammett 
Intelligent Computing Solutions 


----- Original Message -----

From: "Fredrik Korsbäck" <hugge at> 
To: nanog at 
Sent: Sunday, November 25, 2018 2:56:10 PM 
Subject: Re: Cheap switch with a couple 100G 

On 2018-11-25 21:16, Mike Hammett wrote: 
> No, not new. No need to buy new switches when there are so many used available (except for now needing 100G). Switches 
> have an extremely long life. I have a client that has 15 year old Foundry switches that just work, though we're looking 
> to replace them to get some 10G ports. 
> The pricing was part of my point. For years everyone says just skip 40G and go to 100G. The price difference isn't that 
> much.... but it is. 
> "Everyone just skipped 40G and went for 100G." Then why is there such an availability of 40G switches? Obviously they 
> weren't skipped, but purchased and then later replaced. 
> Looks like $280 for an LR4 40G and $800 for an LR4 100G. Still a premium for 100G over 40G. 
> ----- 
> Mike Hammett 
> Intelligent Computing Solutions 

Whole bunch of Apples and Oranges mixed here. 

* 40G in the ISP/Telco world is more or less non-existant. There was never a good uptake on any products aimed towards 
ISP/Telco that did 40G cost-effectively. This is partly because 40G was/is never a thing in the DWDM-world either. There 
was some STM256 built and some OTU3 built aswell but not nearly in the same density as 10G was and 100G is built today, 
it had a weird timing with being fairly close to 100G and abit to distant to cost-effective 10G so it never had any good 
usecase. So if you buy services from a Telco, its very likely that 40G handoff is the least preffered option for them. 
Or most likely not a option at all (like from every company ive been involved with) 

* You compare market-economics with what new stuff cost vs used stuff on ebay/liquidators cost. Thats not a sane way of 
doing math, the reason why old 10/40 nexus and arista etc is plentiful on ebay is because people switched it out to 
something newer, faster. There isn't currently anything faster on the market then 100G-switches so naturally there isn't 
much of that available used. Now that at least some product-families (spine switches) getting 400G with the new 
TH3-switches we can assume that there is a decent amount of older 100G spines getting decommisioned, and hence getting 
available in the second hand market (maybe even late next year). However there has been _a lot_ of datacenters being 
lifted from 10G/40G to 25/50/100G architecture the last year, so it makes sense that the predecessor is on ebay. 

If you are to buy *new* stuff id say that going for 100G of 40G architecture makes sense in almost every aspect, 
regardless of what products and usecase you have. If you rely on second-hand, then sure, 40G might be a decent choice. 
However i would cry if id have to buy 40G optics today since i know they be binned in a year anyway. (4x10G PIR is still 
usable optics in 100G land though). 


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