T1 vs. T2 [WAS: Apology: [Tier-2 reachability and multihoming]]

Tue Mar 29 20:36:08 UTC 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 
> Admin.
>
> 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?

I would be AMAZINGLY interested if anyone confirms the above paragraph.

AFAIK, 701/1239/209/etc. do not give full tables to _anyone_ unless 
they are paid.

Someone care to correct me?

-- 
TTFN,
patrick