Re: [Roll] FW: New Version Notification for draft-thubert-roll-fundamentals-01

["Pascal Thubert (pthubert)" <[e-mail]>]

Thanks Phil :) 

Pascal

>-----Original Message-----
>From: Philip Levis [mailto:[e-mail]]
>Sent: vendredi 10 avril 2009 15:52
>To: Pascal Thubert (pthubert)
>Cc: [e-mail]
>Subject: Re: [Roll] FW: New Version Notification for
draft-thubert-roll-fundamentals-01
>
>On Apr 9, 2009, at 1:59 AM, Pascal Thubert (pthubert) wrote:
>
>> 1) This contribution details the formation of a Distance Vector tree
>> using ND extensions; most existing contributions to this WG suggest
>> that approach (Teco's BRDP, Arsalan & al. 's Hydro's Default Route
>> Formation, Phil & al. Usenix paper's Tree based routing...) and the
>> value we provide here is more refined details on such operation, to
>> address for instance merging and splitting of trees or the
>> integration with the 6LoWPAN backbone.
>
>It's worth noting that the networking abstractions paper is, at this
>point, 5 years old. Protocols have progressed a lot since then. And I
>think it's safe to say that the statements of "IP doesn't seem to be
>useful" should be "at that time, we didn't think IP would be useful
>and gosh were we wrong!"
>
>> Basically, since we have a depth, we have feasible parents (of
>> lesser depth) and siblings (of same depth). The draft suggests that
>> we can select any parent to forward on a per packet basis using the
>> best metric or more advanced load balancing functionality; if that
>> fails then we can use a sibling with some basic loop avoidance like
>> poison return or more advanced path vector (for hydrophiles).
>
>Here's a URL to a paper that describes one way to solve this problem,
>using the techniques I mentioned a few weeks ago and touched on in my
>talk in SF:
>
>http://sing.stanford.edu/pubs/ctp.pdf
>
>The source code for CTP (the tree protocol in the paper) is part of a
>TinyOS release and is under a BSD license. It can be found at
>
>http://www.tinyos.net/tinyos-2.x/tos/lib/net/ctp/
>
>Phil