Re: [6lo] New Version Notification for draft-thubert-6lo-multicast-registration-00.txt

Ok everyone, please excuse the fumbling of the new guy. My previous comments were actually for this draft, not the one I indicated earlier. Please disregard my last email.

Repeated, now for the correct draft:
Hi Pascal,
  This is a very good addition. It is needed for devices that have very limited resources. Battery devices in the utility industry sleep for periods of time and are not conducive to the discovery methods that require broadcast.
I do have  few comments:
-	In the introduction it mentions that energy drain and then further qualifies it to transmissions. In reality listening is also a significant power consumer which is why many battery devices employ sampled listening.
-	In the third last paragraph of the introduction it talks about the registration of “a multicast address”. It should not be limited to registering a single multicast address. Constrained devices may need to receive from multiple multicast addresses.
-	The last paragraph of section 3 indicates that the multicast frames are unicast to the each 6LN that registers for a multicast address. If the MAC supports it, why not allow broadcast?

Best regards,

Gene Falendysz
864-723-1395 

-----Original Message-----
From: 6lo <6lo-bounces@ietf.org> On Behalf Of Pascal Thubert (pthubert)
Sent: Monday, October 4, 2021 12:45 PM
To: 6lo@ietf.org
Subject: [EXTERNAL] [6lo] FW: New Version Notification for draft-thubert-6lo-multicast-registration-00.txt

Dear all:

I published an early draft for the support of multicast address registration so that a 6LN that registers its unicast GUA/ULA addresses using RFC 8505 can also register to multicast streams the same way. This makes the 6LN life a lot easier than MLDv2, which requires the host to listen to multicast queries from the router, same bottom line as with classical ND really. 

The draft has an overview and some deployment considerations that give a good idea of where it's going. It will also cover the equivalent of RFC 901à to inject the multicast registration into the RPL MOP 3 that is how RPL supports multicast.

Before I dive in the gory details, I'd appreciate feedback to unsure that the new operation as currently laid out in the draft is consistent with your expectations.

Please share your thoughts;

Pascal

-----Original Message-----
From: internet-drafts@ietf.org <internet-drafts@ietf.org> 
Sent: jeudi 30 septembre 2021 11:46
To: Pascal Thubert (pthubert) <pthubert@cisco.com>
Subject: New Version Notification for draft-thubert-6lo-multicast-registration-00.txt

A new version of I-D, draft-thubert-6lo-multicast-registration-00.txt
has been successfully submitted by Pascal Thubert and posted to the IETF repository.

Name:		draft-thubert-6lo-multicast-registration
Revision:	00
Title:		IPv6 Neighbor Discovery Multicast Address Registration
Document date:	2021-09-30
Group:		Individual Submission
Pages:		14
URL:            https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-thubert-6lo-multicast-registration-00.txt__;!!F7jv3iA!ln-6xp6O6lT5yo8nqyBDoS_x1WzcdItAPZzGs5ALHK4BjvnH0qp-MdyGEFKIb640aV8$ 
Status:         https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-thubert-6lo-multicast-registration/__;!!F7jv3iA!ln-6xp6O6lT5yo8nqyBDoS_x1WzcdItAPZzGs5ALHK4BjvnH0qp-MdyGEFKI2d-DpU8$ 
Html:           https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-thubert-6lo-multicast-registration-00.html__;!!F7jv3iA!ln-6xp6O6lT5yo8nqyBDoS_x1WzcdItAPZzGs5ALHK4BjvnH0qp-MdyGEFKIn2-lpWc$ 
Htmlized:       https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-thubert-6lo-multicast-registration__;!!F7jv3iA!ln-6xp6O6lT5yo8nqyBDoS_x1WzcdItAPZzGs5ALHK4BjvnH0qp-MdyGEFKIklkF1BY$ 

Abstract:
   This document updates RFC 8505 in order to enable the registration by
   a 6LN of an IPv6 multicast address to a 6LR.  This document also
   extends RFC 9010 to enable the 6LR to inject the address in the RPL
   multicast support.

The IETF Secretariat

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