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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 115
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