Seen problems for scaling caused by Multihoming. Now lets look at Multicast, and briefly, at Mobile Routing.
We've seen a very simple form of multicast already - flooding, as used in link-state advertisements for intra-domain routing is a way to deliver updates to all routers (but not everyone else) - i.e. selectively get a packet (or a stream or flow of packets) from one of more sources to more than just one destination, without the source having to repeatedly transmit separate times for each recipient...
An interesting question area for supervisions is: what possible security problems could arise because of IP multicast, if widely available to end users?
The best analysis I know of MOSPF that NASA used is by John Moy That was very successful in practice due to a well managed network, and very good optimisations based on real world usage.
For a view of what you do "above" IP multicast to acieve reliable delivery, one good example is Pragmatic General Multicast, which was deployed in share trading networks. Why not TCP is an interesting excercise!.
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