Re: transit and peering costs projections

[Bill Woodcock <woody () pch net>]

> On Oct 15, 2023, at 01:01, Dave Taht <dave.taht () gmail com> wrote:
> I am under the impression that many IXPs remain very successful,

I know of 760 active IXPs, out of 1,148 total, so, over 31 years, two-thirds are still successful now.  Obviously they 
didn’t all start 31 years ago, they started on a gradually-accelerating curve.  I guess we could do the visualization 
to plot range of lifespans versus start dates, but we haven’t done that as yet.

> states without them suffer

Any populated area without one or more of them suffers by comparison with areas that do have them.  States, countries, 
cities, etc.  There are still a surprising number of whole countries that don’t yet have one.  We try to prioritize 
those in our work:

https://www.pch.net/ixp/summary

> I also find the concept of doing micro IXPs at the city level, appealing, and now achievable with cheap gear.

This has always, by definition, been achievable, since it’s the only way any IXP has ever succeeded, really.  I mean, 
big sample set, bell curve, you can always find a few things out at the fringes to argue about, but the thing that 
allows an IXP to succeed is good APBDC, and the thing that most frequently kills IXPs is over-investment.  An expensive 
switch at the outset is a huge liability, and one of the things most likely to tank a startup IXP.  Notably, that 
doesn’t mean a switch that costs the IXP a lot of money: you can tank an IXP by donating an expensive switch for free.  
Expensive switches have expensive maintenance, whether you’re paying for it or not.  Maintenance means down-time, and 
down-time raises APBDC, regardless of whether you’ve laid out cash in parallel with it.

> Finer grained cross connects between telco and ISP and IXP would lower latencies across town quite hugely...

Of course, and that requires that they show up in the same building, ideally with an MMR.  The same places that work 
well for IXPs.  Interconnection basically just requires a lot of networks be present close to a population center.  
Which always presents a little tension vis-a-vis datacenters, which profit immensely if there’s a successful IXP in 
them, but can never afford to locate themselves where IXPs would be most valuable, and don’t like to have to provide 
free backhaul to better IXP locations.

                                -Bill

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