IGMP helps the router know who wants to receive specific multicast traffic, but that router needs to communicate this information with the rest of the network. In other words, it needs to tell the rest of the network how to deliver traffic for that group. This process is accomplished using multicast routing protocols and one that is used in modern networks is PIM. Some legacy multicast protocols include:
- Multicast OSPF (MOSPF): Not supported on Cisco equipment.
- Distance Vector Multicast Routing Protocol (DVMRP): Supported on Cisco equipment, but not commonly used.
From a design standpoint . . .
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