Re: [Mobopts] [IRSG] review of draft-irtf-mobopts-mmcastv6-ps-06.txt
Rajeev Koodli <rajeev_koodli@yahoo.com> Fri, 27 March 2009 18:14 UTC
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Date: Fri, 27 Mar 2009 11:15:15 -0700
From: Rajeev Koodli <rajeev_koodli@yahoo.com>
To: irsg@ISI.EDU, Craig Partridge <craig@aland.bbn.com>
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Cc: mobopts@irtf.org
Subject: Re: [Mobopts] [IRSG] review of draft-irtf-mobopts-mmcastv6-ps-06.txt
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Hi Craig, many thanks for your thoughtful review. I am sure the authors and the RG find this useful. Regards, -Rajeev --- On Tue, 3/24/09, Craig Partridge <craig@aland.bbn.com> wrote: From: Craig Partridge <craig@aland.bbn.com> Subject: [IRSG] review of draft-irtf-mobopts-mmcastv6-ps-06.txt To: irsg@ISI.EDU Date: Tuesday, March 24, 2009, 9:22 AM I had two almost contradictory views after reviewing the document. The first view is that it is very well-informed and presents a lot of complex information well. The second view is that it seems lost -- that it doesn't know what it is trying to do and where it is going. So, I'm comfortable seeing it published -- I think some folks will find it useful, but have some suggestions for how it could be improved to work as a roadmap for research/thinking about the problem of multicast mobility in wireless (which I think is what it aspires to be). Comments: * First, the draft should be more explicit that its focus is on multicast IPv6 mobility in WIRELESS environments. You can read the early part of the draft and think you might be involved in worrying about someone unplugging from one wired network and plugging into wired network. Particular odd is that Figure 1 clearly envisions wireless edge networks (single and multihop) yet never says wireless anywhere in the text around it. (Example -- "wireless" appears in the abstract but then not again until page 8...) * The document appears to be seeking to define a set of constraints within which a solution must appear. I took the step of capitalizing every MUST/MUST NOT and SHOULD/SHOULD NOT in the document and when you do that the document is clearly a half-thought-out requirements document. I suspect the authors would be surprised at themselves if they undertook the experiment. I mention it because I often reacted that the document was setting requirements in one spot but not another and I wondered why. * in section 2.1, "jointly support unicast and multicast" -- why not broadcast and anycast as well? (esp. as broadcast is near universal in wireless and anycast apparently matters) * in section 2.2.1, 2nd bullet, why would we enable multicast in a network but ban a particular multicast group from circulation? (Needs some more explanation here about why this happens -- it is a surprising restriction not mentioned earlier). * 2.2.2 uses the word "n-casting" in a context where it is clear the draft things n-casting is evil, but n-casting is never defined anywhere in the document. * 2.4 "Facing deployment complexity, it is desirable that any solution for mobile multicast SHOULD leave routing protocosl unchanged". [Note I capitalized SHOULD to point out the restriction here]. Why is this desired? If we found a routing approach that worked better for all environments and supported multicast, wouldn't we prefer that? * 4.1 -- never mentions that wireless is inherently a broadcast medium and that there may be opportunities to exploit this feature. Especially for receivers, an inherently multicast medium makes it easier to rejoin groups (if the group is already live, you can immediately listen in). Craig _______________________________________________ IRSG mailing list IRSG@mailman.isi.edu http://mailman.isi.edu/mailman/listinfo/irsg
- Re: [Mobopts] [IRSG] review of draft-irtf-mobopts… Rajeev Koodli
- Re: [Mobopts] [IRSG] review of draft-irtf-mobopts… Thomas C. Schmidt
- Re: [Mobopts] [IRSG] review of draft-irtf-mobopts… Thomas C. Schmidt
- Re: [Mobopts] [IRSG] review of draft-irtf-mobopts… Craig Partridge
- Re: [Mobopts] [IRSG] review of draft-irtf-mobopts… Thomas C. Schmidt