Data Multicasting Book

Data Multicasting Dense Mode

Dense mode multicasting is the distribution of media to multiple users within a data network where many or most of the users that are connected to the network are part of the multicast group. In dense mode multicast systems, the network is flooded with multicast messages and group members who are not connected to the network are pruned from the multicast tree. Members of a dense mode multicasting system often request connections to the multicast group after the tree has been created.

Flooding

Flooding is an action of forwarding a frame onto all ports of a switch except the port on which it arrived. Flooding may be used for frames with multicast addresses or unknown unicast destination addresses.

Pruning

Pruning is the process of disconnecting connections that are no longer active in a communication network. An example of pruning is the removal of users in a dense mode multicast network that have been added but did not subscribe to or are not using the multicast service. Multicast pruning is a process that removes connections in a multicast tree that are no longer needed or used.

Grafting

Grafting is the process of adding a leaf or group member to a multicast session while the multicast session is in progress (late entry or reconnection). Grafting allows late entry to a multicast session.

This figure shows how a data network may be setup to allow dense mode multicasting. This example shows that dense mode multicasting floods all routers in the network with multicast information. Devices that are not interested are removed (pruned) from the distribution tree.

Dense Mode Data Multicasting Diagram

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Data Multicasting Books

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Introduction to Data Multicasting

This book explains how multicasting systems operate, ways to form distribution trees, and group management. The different types of multicast protocols are explained along with how multicast systems can provide reliable services with different levels of quality of service. You will learn about other ways to provide multicast services such as using gridcasting or peercasting

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