protocol-independent multicast

The four modes are:

• sparse mode (SM)
• dense mode (DM)
• source-specific multicast (SSM)
• bidirectional.

The most common mode in PIM is the sparse mode. It is used for transmission of data to nodes in multiple Internet domains, where it is expected that only a small proportion of the potential nodes will actually subscribe. Dense mode, in contrast to sparse mode, is used when it is expected that a large proportion of the potential nodes will subscribe to the multicast. In source-specific multicast, paths (also called trees) originate (or are rooted) at a single, defined source, whereas bidirectional PIM is not source-specific.

The term "protocol independent" means that PIM can function by making use of routing information supplied by a variety of communications protocols. In information technology, a protocol is a defined set of rules that end points in a circuit or network employ to facilitate communication.

Read more about protocol-independent multicast: - Full specifications of PIM modes are available at the Protocol Independent Multicast Working Group Website. - Dataconnection.com provides an overview.

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