Multicast Routing Protocols

• Multicast routing protocols build trees where the “leaves” are the subnets containing at least one group member (detected by IGMP)

• Tree types:

  • Source-based trees: one tree per (source, group) pair
  • Shared trees: one tree per group

• Tree building methods:

  • Data driven: calculate the tree only when the first packet is seen
    • Broadcast-and-prune: Multicast tree = broadcast tree - non-multicast branches

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