Re: Internet Exchange Questions

[Bill Woodcock <woody () zocalo net>]

    > > I know of 323 IXes today.
    > > http://www.pch.net/documents/data/exchange-points/ep-in-addrs.xls
    >
    >   Well, this is one place where we diverge... :)
    >   I'd state that there are 323 prefixes in use at exchanges
    >   but that there are somewhat fewer switch fabrics in place, e.g.
    >   a single switch fabric can & does host more than one prefix.

Correct.  And there are sometimes multiple switch fabrics in one facility,
usually in the case that there are separate fabrics/subnets for IPv4
unicast, multicast, and IPv6.

                                -Bill