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Question on the topology of Internet Exchange Points

  • From: Kai Chen
  • Date: Thu Feb 14 12:11:52 2008
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A typical Internet Exchange Point (IXP) consists of one or more network switches, to which each of the participating ISPs connect. We call it the exchange-based topology. My question is if some current IXPs use directly-connected topology, in which ISPs just connect to each other by direct link, not through a network switch?? If so, what's the percentage of this directly-connected case?
 
Kai