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Interesting Properties Number of P-tunnels determined by number of PEs that have data to send generally much smaller than total number of PEs therefore addresses PIM/MI-PMSI scalability issues When receiving data on MI-PMSI, can always tell which PE transmitted it inferred from LSP label, since only root transmits data on LSP data arriving from “wrong” upstream PE easily discarded makes efficient support of C-bidir possible eliminates need for single forwarder selection asserts never occur Does not require a second (upstream-assigned) MPLS label Still allows use of S-PMSIs as necessary |