As a broadband network progresses rapidly, there is a pressing need for each ISPs and network carriers to provide not only the internet access service but also an attractive broadband service like contents delivery and video chat service to their customers. But because conventional IP multicast technology is lacking in scalability performance, QoS guarantee mechanism and traffic engineering (TE) mechanism, it can not distribute high quality video contents to millions of customer at the same time in a scalable and reliable manner.

Therefore this paper proposes the new scalable multicast MPLS technology which can resolve these constrains. The Multicast MPLS technology is MPLS signaling protocol which can handle both multicast and unicast traffic by setting point-to-multipoint (P2MP) and point-to-point (P2P) LSPs simultaneously. The P2MP extension is realized on RSVP-TE (RFC3209). By introducing Tree Explicit Route Object (TERO), the proposed protocol can set any kind of P2MP LSPs; cost minimum (Steiner) P2MP LSP, delay constrained P2MP LSP according to application demands. Therefore proposed multicast MPLS technology can guarantee variable QoS level of multicast traffic even unicast traffic coexists in the network.

This paper also proposes content delivery network which can provide IP-TV and Live distribution service by using this multicast MPLS technology. Some session signaling (e.g. IGMP) interworking function for QoS delivery are also proposed in this paper. By comparing its QoS and TE performance with IP multicast technology, we founded that multicast MPLS is promising technology for next generation contents delivery networks.