On Aug 27, 2007, at 12:38 PM, Kris Pister wrote:
Carsten - I'm using 6lowpan in the broad sense of the original
acronym, not just RFC4919. That may be incorrect, and I should use
different terminology.
Joe - what layer does MPLS fit in? MPLS looks a little weird, and
a little "2.5"-ish, but to me it's the approach that makes the most
sense for 6lowpan. I haven't gone back to read all of the
discussion, but it seems like the only thing that got added in v6
was the flow label. This flow label provides a wonderful
opportunity to work with protocols like HART and sp100 that use an
L3 graph-ID to govern L2 operation. I think that we could define a
different HC that keeps the v6 flow label and uses that to control
L2. I'm not sure how much of RSVP, etc would be needed to pull
this off, but it seems like it should be possible to do something
very similar to what already exists for MPLS (but probably
simplified, compressed, etc). I'd like to work on this with
someone who is more facile with all of the L3 stuff (which I am not).
As discussed in the past, this may be an option indeed, using a PCE-
based or
distributed approach to compute paths instantiated by some protocols
TBD.
This would be very much similar to MPLS and in line with the requirement
for L3 routing. Should a WG (RSN) be formed, this would be the place
where
to discuss the pros/cons of such approach. But before discussing the
routing
solution we first need to flesh out the application specific routing
requirement
IDs since such solution may clearly not be applicable to all scenarios.
Thanks.
JP.
ksjp
Joe Polastre wrote:
For now, RFC4919 takes the stance that L2 routing ("mesh") is an
integral part of the 6lowpan requirements.
First comment is that mesh is a networking protocol, not a data-link
protocol. Thus, it cannot be an L2 "routing" requirement.
Since IP is at L3, I agree with Kris--mesh can either be L2.5 (which
is a bit weird IMHO), it can co-exist with IP (in an undefined way),
or it can be leveraged above IP similar to overlays.
-Joe
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