Re: [RRG] Comments on draft-lewis-lisp-interworking

[Pekka Savola <pekkas@netcore.fi>]

On Wed, 19 Mar 2008, Dino Farinacci wrote:
> > Have you thought more about this now, and can you say something about it
> > on the list?
>
> It's the same answer I said when I was standing up at RRG. Providers will do 
> whatever they can to attract traffic. They typically don't want to say no. 
> The more traffic they attract the more peering they can get. And the business 
> opportunities start from there.

I may be missing something as I wasn't at the meeting, and at the risk 
of stating the obvious...

End-site would not want to attract traffic that would result in giving 
transit to other sites (they'll likely have to pay for the traffic for 
their upstream ISP per megabit).

An ISP would be OK attracting traffic from its customers (or 
customers' customers etc.) because they'll pay for it -- depending on 
where in the foodchain the ISP is, they may get a payment in bulk or 
per megabit.

However, if there is some ISP B that provides a free PTR ("a la 6to4 
relay") that peers with ISP A, ISP A has little incentive to deploy a 
PTR of its own (provided that the traffic to ISP B's PTR is not too 
prohibitive) unless it is a tier1/tier2 (ie., has downstream 
multihomed customer ASs that pay per mbit, and you can only attract 
that traffic you advertise the aggregate downstream).

However, an ISP would not want to attract traffic from their peers 
(except if the traffic is targeting their customers) because they 
won't get paid for it and would in essence be giving out free transit.

As a result, I could see especially tier1/2 ISPs deploying PTRs (if 
there is another incentive to do so) but they would not want to 
advertise that to their peers.  But unless all the tier1s do it (or 
someone provides the service for free), some folks in the Internet 
become unreachable.  On the other hand, it's difficult to see the case 
for any end-site deploying PTR.

--
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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