Multicast Routing Protocols
Multicast differs from simple broadcast in the sense that it only attempts to deliver a packet to interested users. It differs from unicast or pointcast in that only one copy of a packet travels over any link. For large-scale applications, this can represent a huge reduction in the use of bandwidth and switching capacity.
The characteristics of multicast routing are well suited to conferencing applications, but these are by no means the only applications. Multicast can also enable auto-resource discovery through the use of well-known groups. In earlier chapters, you saw how the ALL-OSPF-ROUTERS and ALL-RIPV2-routers group addresses are used in neighbor discovery.
Multicast groups are identified by the IP Class D address ...
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