On Thu, Jun 25, 2015 at 08:35:35AM +0900, Randy Bush wrote: > > Is the last paragraph of 4.1 an IETF consensus position on how operators > > might charge one another? It would be good to find a way to word this > > that look more like statements of fact and less like charging advice. > > darn hard as there are no facts there and it is first class lawyer > bait. Indeed. It might be better to remove this part: "It is possible that the behavior of the neighboring AS causing the unexpected traffic flows opposes the peering agreement. In this case, an operator could account the amount of traffic that has been subject to the unexpected flows, using traffic measurement protocols such as IPFIX, and charge the peer for that traffic. That is, the operator can claim that it has been a provider of that peer for the traffic that transited between the two ASes." Instead something like: "It is possible that the behavior of the neighboring AS causing the unexpected traffic flows violates a contractual agreement between the two networks." And just leave it at that. It is worth noting that, although from a technical perspective it is not always trivial to proactively prevent these types of traffic flows, you could try and capture your intentions in a contract and deal with fallout as said contract prescribed. Kind regards, Job