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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
Flooding
The simplest algorithm for the delivery of multicast packets is
for the multicast router to forward a multicast packet to all
interfaces. This is referred to as flooding. An equally simple
168 VH-2402-L3 Management Guide
Figure 2-16. IGMP State Transitions
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