Re: [6lowpan] Mesh under routing and Neighbor Discovery
Myung Jong Lee <lee@ccny.cuny.edu> Tue, 05 June 2012 03:40 UTC
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Date: Tue, 05 Jun 2012 12:40:57 +0900
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From: Myung Jong Lee <lee@ccny.cuny.edu>
To: Samita Chakrabarti <samita.chakrabarti@ericsson.com>
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Subject: Re: [6lowpan] Mesh under routing and Neighbor Discovery
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Hi Damien and all, Though I am not an active member for 6lowpan, I just like to note that there is a "mesh under" routing standard, IEEE 802.15.5 a recommended practice, completed in 2009. You may take a look at it. It is built on IEEE 802.15.4b and sitting below IP layer. I believe it could be one of the feasible approaches for mesh under technologies. For the details, you may refer to the standard itself or the paper, " IEEE 802.15.5 WPAN mesh standard-low rate part: meshing the wireless sensor networks," IEEE JSAC, Vol 28, No. 7, 2010 . Thanks, Myung On Tue, Jun 5, 2012 at 9:10 AM, Samita Chakrabarti < samita.chakrabarti@ericsson.com> wrote: > ** > Hi Damien, > > Please find responses in-line. > > > ------------------------------ > *From:* 6lowpan-bounces@ietf.org [mailto:6lowpan-bounces@ietf.org] *On > Behalf Of *Damien Roth > *Sent:* Monday, June 04, 2012 5:03 AM > *To:* 6lowpan@ietf.org > *Subject:* [6lowpan] Mesh under routing and Neighbor Discovery > > Hello, > > I continue my investigations the neighbor discovery protocol > for 6LoWPAN (draft-ietf-6lowpan-nd-18), and there is one point that remains > unclear to me. > > With 6LoWPAN, two routing mechanisms can be used : route over and mesh > under. Everything is OK with the route over mechanism but I'm locked with > mesh-under. In mesh-under routing, there is only two entities, the 6LBR > (border router) and the hosts. Multiple hops may be needed to for hosts to > reach the 6LBR. > > ====> In mesh under case, the assumption is that all hosts are directly > IP-reachable from 6LBR. How the packets are flown from a host to the 6LBR ( > using a L2-mechanism) is out of scope of the document. Currently I don't > know of L2-routing protocols for mesh-under network - however, there might > be some proprietary ones. > > My problem is in multihop configuration : how the multicast Router > Solicitation messages, used by the neighbor discovery protocol, can reach > the 6LBR ? > Does it depends on the routing protocol used ? > > > ====> Please check the section 10 (Examples) to get an understanding how > the routers and hosts bootstrap in the multi-hop 6lowpan networks. Initial > multicast RS is sent only to the local subnet and taken care by the local > 6LR router in case of route-over scenario. > > > > -Samita > > _______________________________________________ > 6lowpan mailing list > 6lowpan@ietf.org > https://www.ietf.org/mailman/listinfo/6lowpan > > -- Myung J. Lee, Ph.D Professor Dept. of Electrical and Computer Engineering City University of New York, City College 140th Street, New York, NY 10031 (O)+1-212-650-7260 (E) lee@ccny.cuny.edu
- [6lowpan] Mesh under routing and Neighbor Discove… Damien Roth
- Re: [6lowpan] Mesh under routing and Neighbor Dis… Samita Chakrabarti
- Re: [6lowpan] Mesh under routing and Neighbor Dis… Myung Jong Lee
- Re: [6lowpan] Mesh under routing and Neighbor Dis… Robert Moskowitz
- Re: [6lowpan] Mesh under routing and Neighbor Dis… Benjamin A. Rolfe