Today, I send all NetFlows in/out of my 2851 routers' WAN interfaces, to a server local to each router. I have ~ 30 routers around the world. I'm thinking about centralizing these servers so that I have one per region (APAC, Americas, etc). But I don't want to send the NetFlows across these WAN links if they are big enough to cause a utilization issue. But with NetFlows... I've only ever used them for troubleshooting purposes... I have never checked to see how much data per second they generate! Any tips for what commands could help me find this out, and what output I should focus on?