1. the art that the invention defined in the claims; How to set up a multicast label switched paths in MPLS Networks; 2. The invention attempts to solve the technical challenges; By configuring a multicast label information to support multicast in MPLS networks for multi-party communication provides a way to set the multicast label switched path.; 3. Resolution of the subject matter of the invention,; By sending a multicast group identifier and the one it is assigned a label, explicitly containing the reverse path join message he or she wanted to join to the upstream node in the label edge router, and the upstream node merge all the received join message, a new sending a join message, including the explicit backward path the assigned labels and to an upstream node, and upon receiving the label information from the source of the multicast group, after removing their identifier from the tree route information of the label information, the multicast group transmit to their downstream node that you want to participate in.
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