This document describes the worldwide demand for VPN services grows, the demand for Multicast VPN (MVPN) services is likewise accelerating. Over the past 10 years, multicast has become prevalent in financial applications, software downloads, and audio and video streaming applications. Gartner predicts that 80 percent of Global 2000 companies will deploy IP Multicast technology by 2006. Until very recently, the only way to support multicast over a Multiprotocol Label Switching (MPLS) network was for the service provider to build manual generic routing encapsulation (GRE) tunnels between every source-receiver pair. Because of the large administrative costs, this manual configuration solution presents serious challenges even for companies with a small number of sites and customers.
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