[Dshield] Cogent / Level 3
John B. Holmblad
jholmblad at aol.com
Fri Oct 7 23:01:14 GMT 2005
I will second Alan's compliment on the clarity of the explanation.
Another way to clarify the distinction between "transit" and peering
is to think of transit as "paid peering" where the smaller isp has to
pay to have the larger ISP carry the transit traffic across the larger
ISP's network that would be otherwise be free if the two ISP's agreed
to peer with one another.
Alternatively, peering could instead be called "settlement free transit"
and "transit" referred to as "settlement paid transit" but the industry
terminology is already long fixed on the terms "peering", and "transit"..
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Alan Frayer wrote:
>Brian Dessent wrote:
>>The main factor at issue is the notion of peering. When two autonomous
>>systems peer, they agree to trade traffic for free. This is often
>>called settlement free interconnect because neither party is obligated
>>to continue the relationship -- it is meant to be a mutually beneficial
>>agreement that saves both sides money. Note that the only traffic
>>traded here is that which is sourced in one peer's AS (or that peer's
>>downstream) and destined for the other AS (or that peer's downstream.)
>>In other words the peers only advertise their own routes.
>Brian, I just want to thank you for a very clearly written explanation
>of what goes on at that level of the net. Many of us consumers
>understand the nuts and bolts, but not the economies and politics that
>make the Internet work (nor not, as the case may be). I just wanted you
>to know this was appreciated.
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