Issues

• Scalability

  • State space
  • PIM-DM per (S,G) timers: O(S x G x n) timers that must be managed with fine granularity

• Integration with PIM Sparse Mode

• Need for tunneling (GRE)

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Major challenge: efficient fine-grained timer handling for large-scale multicast

GRE: Needed for interoperable, protocol-independent tunneling

(Gated has generic IPIP tunneling but that’s not

interoperable with cisco)