> On Feb 23, 2024, at 01:09, Dave Cohen <[email protected]> wrote: > Prior to roughly 2016-17, most IXs in the US that we worked with were in a > single site
The vast majority of IXPs are still in a single site, but all the ones with
normal switch-fabric extension policies are on a growth path to multiple sites,
provided the markets they’re in are of sufficient size to support it. Both of
those things have been the case for more than thirty years.
> …that site was often not a third-party facility, often a private R&E oriented
> datacenter.
Can you explain in more words what you’re saying here? IXPs spring up in all
kinds of sites… Many of them are in closets of buildings which happen to have
multiple ISPs already present because all of the ISPs already have customers in
the building. Some of them are in datacenters, and some of those are “neutral”
datacenters, while others are owned or operated by one of the participating
networks, and others are governmental or academic. There’s a very wide
diversity of IXP siting arrangements, and often individual IXPs are spread
across several different kinds of sites; that’s always been the case.
Over time, existing IXPs, as they grow, tend to spread across more sites; but
also, new IXPs form, which almost always form in a single location before
growing to multiple sites. IXPs that _start_ organically in multiple sites
simultaneously certainly aren’t common.
-Bill
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