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Limitations of draft-rosen At least one multicast tree per customer in core No option to aggregate multicast customers on one tree Multicast traffic is GRE (not MPLS) encapsulated Bandwidth and encaps/decaps cost Operational cost—different mcast and unicast data planes PIM the only fully described way to build core trees Can’t leverage p2mp RSVP-TE, mLDP PE-PE exchange of C-routes using per-customer PIM instances Inter-AS challenges |