I'm certain there are thresholds to that. Carrier grade mitigation solutions will start low and ramp up to 5, 6, 7, etc. figures depending on the attack and amount of bandwidth to be filtered among other variables.
>>> My point was, if you "mitigate" the attack vs. null routing the target you have to pay for the transit that the attack consumes between your network and the upstream network(s). thanks, -Drew
