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Aggregate P-Multicast Trees Allow one P-multicast Tree to be shared across multiple VPLSs Can be setup using PIM or P2MP MPLS TE No architectural limitation on the P-multicast tree technology Requires a MPLS label to demultiplex a particular VPN ‘Upstream’ label allocation by the root of the tree Egress PEs maintain a separate label space for each P-multicast tree root State grows less than linearly with number of VPLSs Some efficiency of multicast routing may be sacrificed |