I'm the former NOC Director for a national ISP (who quit after saving enough money to get out of that environment). Anyway, we used several utilities (Arbor, homegrown, etc.) to see what kind of traffic was on the backbone. It is relatively simple to set what % of what type of traffic you want to filter. We were using nearly 100% Junipers for peering and that was a good choke point.
Actually, we engineering guys wanted to filter things (like p2p) long before the marketing folks bought into it.
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I'm the former NOC Director for a national ISP (who quit after saving enough money to get out of that environment). Anyway, we used several utilities (Arbor, homegrown, etc.) to see what kind of traffic was on the backbone. It is relatively simple to set what % of what type of traffic you want to filter. We were using nearly 100% Junipers for peering and that was a good choke point. Actually, we engineering guys wanted to filter things (like p2p) long before the marketing folks bought into it.