Re: [Roll] Last Call: <draft-ietf-roll-trickle-mcast-06.txt> (Multicast Protocol for Low power and Lossy Networks (MPL)) to Proposed Standard

Hello,

I've reviewed the draft, and I have a couple comments/questions if that's not too late:

- I don't see why MPL forwarders on the same link should have the same value for PROACTIVE_FORWARDING. It is now RECOMMENDED to make it so, but I don't see the rationale for this recommendation: on the opposite, I think it would allow some forwarders with less power restrictions to be more proactive than others.

- Isn't there a risk that only specifying SEED_SET_ENTRY_LIFETIME without any kind of hysteresis mechanism lead to old Data messages being reinjected in the network? For example, if an MPL forwarder A resets its Control Message trickle timer with a seed (S) close to expiration, there is a risk that a neighbor forwarder that has expired that seed interprets the Control Message as A having new Data messages from seed S, thus resetting its timer for this seed and potentially retransmitting the corresponding Data message(s).

- In section 9.2, it is unclear when the M flag should be cleared or set: why would it be arbitrarily cleared and not indicate whether or not this message's sequence number is the largest one received?

Thank you,

Axel

Le 3 févr. 2014 à 11:23, peter van der Stok <stokcons@xs4all.nl> a écrit :

> I've reviewed draft-ietf-roll-trickle-mcast-06.txt.  The issues
> raised during the WG last call concerning our applications, have been addressed adequately.
> 
> peter van der stok
> 
> Ralph Droms schreef op 2014-01-27 16:58:
>> I've reviewed draft-ietf-roll-trickle-mcast-06.txt.  The issues I
>> raised during the WG last call have been addressed and, in my opinion,
>> the document is now ready for publication.
>> - Ralph
>> On Jan 24, 2014, at 3:16 PM 1/24/14, The IESG <iesg-secretary@ietf.org> wrote:
>>> The IESG has received a request from the Routing Over Low power and Lossy
>>> networks WG (roll) to consider the following document:
>>> - 'Multicast Protocol for Low power and Lossy Networks (MPL)'
>>> <draft-ietf-roll-trickle-mcast-06.txt> as Proposed Standard
>>> This is a second last call, the first one having been abandoned to send
>>> the document back to the working group. But the latest revision addresses
>>> comments that were received during the first last call.
>>> The IESG plans to make a decision in the next few weeks, and solicits
>>> final comments on this action. Please send substantive comments to the
>>> ietf@ietf.org mailing lists by 2014-02-07. Exceptionally, comments may be
>>> sent to iesg@ietf.org instead. In either case, please retain the
>>> beginning of the Subject line to allow automated sorting.
>>> Abstract
>>>  This document specifies the Multicast Protocol for Low power and
>>>  Lossy Networks (MPL) that provides IPv6 multicast forwarding in
>>>  constrained networks.  MPL avoids the need to construct or maintain
>>>  any multicast forwarding topology, disseminating messages to all MPL
>>>  Forwarders in an MPL Domain.  MPL uses the Trickle algorithm to
>>>  manage message transmissions for both control and data-plane
>>>  messages.  Different Trickle parameter configurations allow MPL to
>>>  trade between dissemination latency and transmission efficiency.
>>> The file can be obtained via
>>> http://datatracker.ietf.org/doc/draft-ietf-roll-trickle-mcast/
>>> IESG discussion can be tracked via
>>> http://datatracker.ietf.org/doc/draft-ietf-roll-trickle-mcast/ballot/
>>> The following IPR Declarations may be related to this I-D:
>>>  http://datatracker.ietf.org/ipr/1858/
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