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Re: T1 vs. T2 [WAS: Apology: [Tier-2 reachability and multihoming]]
- From: Patrick W Gilmore
- Date: Tue Mar 29 15:38:45 2005
On Mar 29, 2005, at 3:27 PM, John Dupuy wrote:
I guess I'm looking at this too much from the point of view of a BGP
I would be AMAZINGLY interested if anyone confirms the above paragraph.
Yes, if you are looking at this from the point of view of payment,
then the top ISPs do not pay each other.
I was looking at it from a route announcement point of view. Transit
is where AS A advertises full routes to AS B. Thus, AS B is getting
transit from A. Peering is where A & B only advertise their network
and, possibly, the networks that stub or purchase transit from them.
It is my understanding that the top ISPs "trade transit". They provide
full routes to each other without payment, regardless of how or where
the route was learned from. They are willing to pass some traffic
without compensation because it makes for better connectivity. From an
announcement POV they are not peering.
I am still curious: do any of the larger ISPs on this list want to
confirm/deny the previous paragraph?
AFAIK, 701/1239/209/etc. do not give full tables to _anyone_ unless
they are paid.
Someone care to correct me?