> Often, participants expect to have an IP address assigned for their
> use on an exchange. Usually these delegations are from a common
> block. Where they are not, its hard to tell an exchange from a
> bunch of point2point links. LINX and PAIX have IPv6 prefixes that
> participants can use.

  or, use link-local address on IX switch as documented in

  Unfortunatly, that technique does not have broad commercial
  implementation. In addition, there was some pushback from
  the IETF IDR wg on using this technique. So its still a bit
  "iffy", although a very elegent "haq". (we used it in LA
  for a while but could not get folks to adopt it.)