Re: [Roll] multicast & MLD on LLN

"Turner, Randy" <> Wed, 15 October 2014 16:40 UTC

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From: "Turner, Randy" <>
To: Routing Over Low power and Lossy networks <>
Thread-Topic: [Roll] multicast & MLD on LLN
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Cc: "IJsbrand Wijnands \(iwijnand\)" <>
Subject: Re: [Roll] multicast & MLD on LLN
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There has been a lot of experience and learning around 6lowpans and mesh/LLN scenarios, and it's spread around a bunch of documents across multiple working groups, not all of these groups being active anymore. A portion of these documents contain multiple solutions for multiple overlapping problem spaces, with no "roadmap" to show to navigate through the LLN solution domain.

It might be nice to have a document that "rolls up" the best ideas from these documents into a guide for developers. For instance, "cherry picking" mechanisms across RFCs 6775, 6550, etc to produce a definitive way to deliver a solution that can scale to thousands of nodes, or gracefully backdown its capabilities to address smaller home environments

There are great ideas in these documents, I would just like to see this information coalesced, or at a minimum a roadmap to know how to navigate through it all


On Oct 15, 2014, at 6:00 PM, Pascal Thubert (pthubert) <<>> wrote:

Or form a new group :)

What about Routing Over Complete Kaos?

More seriously, it's probably a good idea to goto through the BoF sequence again to analyze what's left to be done.
I can certainly see an analog of what the 6lo is to 6LoWPAN, but for ROLL.



From: Roll [] On Behalf Of Kerry Lynn
Sent: mercredi 15 octobre 2014 17:52
To: Routing Over Low power and Lossy networks
Cc: IJsbrand Wijnands (iwijnand)
Subject: Re: [Roll] multicast & MLD on LLN

Pascal, Carsten, et al.

On Sat, Oct 11, 2014 at 2:39 AM, Carsten Bormann <<>> wrote:
Right, MLD is a host-router protocol.
Routers among them speak a routing protocol, so they wouldn't exchange MLD.
(A RPL "leaf" is a router.)

> Finally I'm looking at BIER see how their ideas could apply to LLNs...

We (TZI) have done (specified, implemented, analyzed) an efficient BIER-like multicast forwarding protocol for non-storing mode a while ago.

I admit to some confusion here.  Is (topology-free) MPL no longer the default
multicast forwarding protocol for LLN?

Need to write that up in an I-D and submit it somewhere.
BIER or ROLL or both?
I thought the goal was to shut down (or is it re-charter) ROLL?  If we're considering
new approaches to multicast forwarding, that may be reason enough to re-charter


Gr??e, Carsten

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