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Re: [RRG] Traffic Engineering scenarios
On Wed, 20 Feb 2008, Jason Schiller wrote:
=== Slide 16 and 17 ===
Smaller ISPs who purchase transit from one or more up streams often use TE
towards their transit providers. They may do this to optimize on best
performance, low latency, high reachability, or to squeeze as much traffic
out of their expensive transit links.
Imagine a large South American ISP that has 16 STM-1s to each of its two
transit providers with half of the links on two different cable
systems. Imagine that the STM-1s are expensive and as a result, in
general, the ISP wants to load them ass full as possible. Additionally,
one of the oceanic cable systems has better performance, and one of the
two up stream providers has better service and support. It is important
some critical customers be guaranteed to be on the better performing cable
system and be delivered to the higher performance and better supported up
Maybe one thing that should be noted in this context about transit
contracts (I guess this is pretty common, but not sure): 1) you have
to pay for the higher of up/downlink, and 2) you have a contracted
basic rate which you will pay whether you have traffic on the link or
not (and then the rate you pay for exceeding that).
If you want to optimize costs (and optimization could be very
significant here), you may need to 1) balance both in/outbound traffic
to a particular transit ISP to be as close to each other as possible,
and 2) be able to put roughly the desired amount of load on different
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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