The future of NAPs & IXPs

John Leong johnleong at
Tue Apr 20 02:00:56 UTC 1999

>From traffic engineering point of view, I suspect the direct circuit
interconnection, private peering model to be considerably simpler to
deal with than the exchanged based model.

In the direct circuit case, if the interconnect pipe does not have the
umph to satisfy the performance characteristics of the peering traffic,
it can be relatively easily detected (percentage of packet loss) and
resolved between the two parties (buy more or fatter pipe).

In the exchange case, assuming the exchange box is connecting an OC12
link from each of 4 providers.  If provider A is experiencing problem
with provider D, it could be due to the problem with the pipe and other
stuff associated with provider D, but just as likely, it may be due to
having too much concurrent traffic from provider B and C with D.  Such
overloading due to [temporal] traffic aggregation can be pretty tricky
to identify [particularly provider A will unlikely to have access to
traffic profile/log of provide B and C] and even tricker to figure out
what to do.

John leong
Bell Labs Research       johnleong at
4995 Patrick Henry Dr.                  Tel: 408-567-4459
Santa Clara, CA 95054                   Fax: 408-567-4448

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