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Aggregate P-Multicast Trees Allow one P-multicast Tree to be shared across multiple VPNs Can be setup using PIM-SM or PIM-SSM or P2MP MPLS TE Support for PIM-Bidir is for further study 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 MVPNs Some efficiency of multicast routing may be sacrificed |