Fundamentals of Operation
IGMP, PIM, MSDP, and MBGP all work together to provide a cohesive framework for intra- and interdomain multicast routing. This section introduces you to the operation of each protocol.
Internet Group Management Protocol
IGMP and PIM work together to subscribe users to particular multicast groups. IGMP is enabled on an interface whenever PIM is enabled. This is usually accomplished with the ip pim sparse-dense-mode interface subcommand. IGMP messages are sent with a TTL of 1, which constrains them to the LAN on which they were originally transmitted. Generally, the IGMP message exchange occurs between hosts and routers, although all devices on the LAN may listen to the exchange of messages to avoid sending or requesting ...
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