Chapter 3. Multicast Routing Protocols
This chapter provides an overview of multicast routing protocols. For a protocol to be deemed a multicast routing protocol, it must at minimum provide the functionality of setting up multicast forwarding state and exchange information about this forwarding state with other multicast routers. By this definition PIM-DM, PIM-SM, and DVMRP are all multicast routing protocols; IGMP, MBGP, and MSDP are not.
Multicast routing protocols can generally be classified into two categories: dense and sparse. By understanding the advantages and disadvantages of each, it is clear to see why PIM-SM has become the protocol of choice for IMR. We describe the characteristics of dense and sparse protocols and briefly discuss examples ...
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