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Multicast Routing Table

Multicast Routing Table. Routing table entries for source-based trees and for core-based trees are different Source-based tree : (Source, Group) or (S, G) entry. Core-based tree: (*, G) entry. Building a Source-Based Tree. Set routing tables according to RPF forwarding Flood-and-Prune.

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Multicast Routing Table

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  1. Multicast Routing Table • Routing table entries for source-based trees and for core-based trees are different • Source-based tree: (Source, Group) or (S, G) entry. • Core-based tree: (*, G) entry.

  2. Building a Source-Based Tree • Set routing tables according to RPF forwarding • Flood-and-Prune

  3. Building a Source-Based Tree • Set routing tables according to RPF forwarding • Flood-and-Prune Flood= Forward packets that arrive on RPF interface on all non-RPF interfaces

  4. Building a Source-Based Tree • Set routing tables according to RPF forwarding • Flood-and-Prune Flood= Forward packets on all non-RPF interfaces Receiver drops packets not received on RPF interface

  5. Building a Source-Based Tree • Set routing tables according to RPF forwarding • Flood-and-Prune Prune= Send a prune message when a packet is received on a non-RPF interface or when there are no receivers downstream Prune message disables routing table entry

  6. Building a Source-Based Tree • When a receiver joins, one needs to re-activate a pruned routing table entry • Grafting Sending a Graft message disables prune, and re-activates routing table entry.

  7. Building a Core-Based Tree • One router is the core • Receiver sends a Join message to RPF neighbour with respect to core • Join message creates (*, G) routing table entry

  8. Building a Core Based Tree • Source sends data to the core • Core forwards data according to routing table entry

  9. Acknowlegements Slides are extracted directly from the following source: • http://www.cs.virginia.edu/~itlab/book/slides/module21-mcastv4.ppt

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