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Multiprotocol Label Switching
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===Multicast addressing=== Multicast was, for the most part, an afterthought in MPLS design. It was introduced by point-to-multipoint RSVP-TE.{{Ref RFC|4875}} It was driven by [[service provider]] requirements to transport broadband video over MPLS. The hub and spoke multipoint LSP ([[HSMP LSP]]) was also introduced by IETF. HSMP LSP is mainly used for multicast, time synchronization, and other purposes.
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