IP Multicast Building Blocks

Implementing an IP multicast network is made simpler by using a number of standardized building blocks. These IP multicast building blocks include a special IP multicast address space, administrative scoping to prevent large-scale routing loops, upstream and downstream interface lists, reverse path forwarding (RPF) to prevent small-scale routing loops, a shortest-path tree (SPT) algorithm to build a minimal distribution tree, and a rendezvous point (RP) and associated rendezvous-point tree (RPT) to allow sparse mode receivers to find sources.

There are six major IP multicast building blocks:

• IP Multicast Addressing
• Administrative Scoping
• Interface Lists
• Reverse-Path Forwarding
• Shortest-Path Tree
• Rendezvous Point, Shared Trees, and the Rendezvous-Point Tree

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