DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

The transition states a host will go through to join or leave a multicast group are shown in the diagram below.

Figure 5-16. IGMP State Transitions

Multicast Routing Algorithms

An algorithm is not a program. An algorithm is a statement of how a problem can be solved. A program is written to implement an algorithm.

Multicast packets are delivered by constructing multicast trees where the multicast router is the trunk, the branches are the various subnetworks that may be present, and the leaves are end recipients of the multicast packets. Several algorithms have been developed to construct these trees and to prune branches that have no active mulitcast group members

Switch Management and Operating Concepts

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