With multicast, the same update takes about an hour. Private networks may come first, but IPMI members have their sites firmly fixed on the Internet, which has the potential to deliver interactive television and radio services, on demand, to users around the world. But even assuming that IP multicast's technical hurdles are cleared and its marketing message gets through, daunting business issues still cloud public multicast deployment. The biggest such barrier has to do with balancing traffic at ISP peering points and the related settlements, or monetary compensation, between them. Basically, if there is more traffic going in one direction than the other, the ISP sending the greater amount must compensate the one sending less.
Multicast traffic can complicate the settlement scenario.
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