ISP needs multicast service to save the bandwidth and costs when more and more large-scale live media applications are emerging in the Internet. There are no proper methods because the localization of IP multicast and Application Level Multicasts. Here we present a suggestion called Layered Overlay Multicast Network (LOMN) for the ISP's live media services. LOMN set up the core multicast tree for live streams by strategically deploying the service brokers (SvBs) and the algorithm of Bandwidth-satisfied multicast in overlay network (BSMON), which is to set up an efficient QoS-satisfied overlay connections between SvBs, balance the overlay traffic and the load on the SvBs. we address critical issues such as scalability, low delays, little delay variations and minimal the cost of multicast tree.
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