Multicasting Dense-Push and Sparse Mode-Pull Down

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Two other factors are important in a multicast network: Dense and Spare modes.

DM [Dense Mode] uses a “push” model to flood multicast traffic (broadcast) to every device. That is, every device gets the data whether they asked for it or not.

SP [Sparse Mode] uses “pull” or “pull down” model where the data is retrieved when asked for (on demand). SP allows RP [Rendezvous Points] or Shared Root to share information about active sources or shared trees.

Dense and Spare mode selection is also based on the amount and urgency (real-time events versus archival) of the content.

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[tags]rp,multicast,dm,dense mode,sparse mode,sm,rendezvous points,shared root[/tags]