- State the problem the paper is trying to solve.
- State the main contribution of the paper: solving a new problem, proposing a new algorithm, or presenting a new evaluation (analysis). If a new problem, why was the problem important? Is the problem still important today? Will the problem be important tomorrow? If a new algorithm or new evaluation (analysis), what are the improvements over previous algorithms or evaluations? How do they come up with the new algorithm or evaluation?
- Summarize the (at most) 3 key main ideas (each in 1 sentence.)
- Critique the main contribution
- Rate the
*significance*of the paper on a scale of 5 (breakthrough), 4 (significant contribution), 3 (modest contribution), 2 (incremental contribution), 1 (no contribution or negative contribution). Explain your rating in a sentence or two. - Rate how
*convincing*the methodology is: how do the authors justify the solution approach or evaluation? Do the authors use arguments, analyses, experiments, simulations, or a combination of them? Do the claims and conclusions follow from the arguments, analyses or experiments? Are the assumptions realistic (at the time of the research)? Are the assumptions still valid today? Are the experiments well designed? Are there different experiments that would be more convincing? Are there other alternatives the authors should have considered? (And, of course, is the paper free of methodological errors.) - What is the most important limitation of the approach?

I would rate this paper as a 3 because it does present a straight-forward, easy-to-implement solution to the growing problems in the area of mulitcast transmissions.

I felt like the authors methodology and assumptions were convincing. I do think it is fair to say that large-scale multicast applications are almost largely single-source and, as such, EXPRESS takes advantage of this assumpiton.

The most important limitation to this approach is that if multi-source multi-cast applications

__do__become more prevelant, the additional overhead from each channel that needs to be created may be significant. - Rate the
- What lessons should researchers and builders take away from this work. What (if any) questions does this work leave open?

The main problem this paper is trying to solve is the weakness of the current IP multicase model to address the problems presented by emerging large-scale multicast applications such as (1) no basis for charging, (2) no access control, and (3) scaling difficulties.

The main contribution of this work is the presentation of an extension to IP multicast which supports the channel model and describes Explicitly Requested Singles Source (EXPRESS) multicast.

(1) Express channels can be provided as a simple modification to the IP
multicast service model using a small portion of the class D address
space.

(2) Based on the authors' estimates, it appears feasible for a router to
support millions of multicast channels without extraordinary investment in
either processing power or memory.

One lesson I will take away from this work is that good solutions often arise from applying new assumptions to old architectures.