+1 L2 bridging is OK if you can do it but not everything looks like Ethernet frames. Not only that but if we have multi-link subnets using route-over, the router to host ratio goes up considerably. The problem space is then multi-link subnets then multi-subnet site/zone/homenets. L3 routing is the only way this is going to work in homenet.
Robert On Wed, Aug 3, 2011 at 6:00 PM, Joel Jaeggli <[email protected]> wrote: > > On Aug 3, 2011, at 9:46 AM, Rajiv Asati (rajiva) wrote: > > > Don, > > > > Just curious about 'smart energy' home network - Why is there a router > > behind the CPE router? > > got a better idea for interconnecting 802.15.4 and 802.3 networks than at > layer-3? > > > Cheers, > > Rajiv > > > > > >> -----Original Message----- > >> From: [email protected] [mailto:[email protected]] On Behalf > > Of Don > >> Sturek > >> Sent: Wednesday, August 03, 2011 10:25 AM > >> To: Torbet, Dan; [email protected]; [email protected] > >> Subject: Re: [v6ops] default LAN routing protocol for IPv6 CE router > >> > >> Hi Dan, > >> > >> Here is the initial scenario we are dealing with in the smart energy > > arena: > >> > >> > >> > >> Provider (eg ISP) Provider (eg > > utility) > >> | > >> | > >> CPE router > >> CPE router > >> | > >> | > >> Router --------------------------------- > > router > >> | Link layer > >> | > >> | Interconnect > >> | > >> <Macs, > >> <Smart appliances, > >> iPads, > >> plug in vehicles, > >> Entertainment....> > > load > >> shed devices....> > >> > >> I purposely drew in the devices the way I did since some of these > > networks > >> will evolve as silos then will interconnect when customers upgrade > > their > >> routers to ones with multiple link layers that accommodate > > interconnection. > >> > >> Ultimately, there will not be such a rigid division of devices like > > shown but > >> wanted to emphasize the likelihood that there will be multiple CPE > > routers in > >> the home and an interconnection between them within the home. > >> > >> Don > >> > >> > >> > >> > >> From: "Torbet, Dan" <[email protected]> > >> Date: Wed, 3 Aug 2011 07:42:53 -0600 > >> To: "[email protected]" <[email protected]>, "[email protected]" > > <[email protected]> > >> Subject: [v6ops] default LAN routing protocol for IPv6 CE router > >> > >> > >> > >> The conversations so far on this topic have been great. I think > > however, we > >> need to take a step back for a moment and think through what the > > HOMENET > >> network looks like when serviced by a CPE Router. In my mind, we have > > a few > >> scenarios that are possible. > >> > >> > >> > >> > >> The first is a CPE ingress router to the home and no other routers. > > There may > >> be in this device multiple SSIDs and they each might need to have > > their own > >> address space and have separate firewall/filtering rules. In this > > case, > >> everything is contained in a single box and so no additional routing > > protocols > >> are needed. This has been defined in the CPE router (RFC 6204) and > > the bis > >> extension that is in draft right now. > >> > >> > >> > >> The second case is a CPE ingress router with N routers behind it. In > > this > >> case, I humbly submit that anything where N is greater than 2 says > > medium > >> sized business maybe larger. I find it real hard to get any deeper > > than 2 > >> routers in series for a HOMENET class device deployment. Anything > > greater than > >> that and you likely would not use this class of device anyway. Sure > > there > >> will be situations where this is not true ,but I'll wager that in 90% > > of the > >> installations where a CPE router is providing the link to the world, > > this will > >> be the case. Even factoring in SmartGrid I just can't see a very deep > >> network. Is there a use case for more than 1 or 2 layers in a HOMENET > >> deployment that uses a CPE router as the connection to the world? To > > be clear > >> here - this is what I mean: > >> > >> (sorry for the poor ASCII art here ) > >> > >> > >> > >> Provider Router -------- CPE router ----------Router > > ------ > >> Router > >> > >> > >> > >> Or > >> > >> > >> > >> > >> > >> Provider > >> > >> | > >> > >> CPE Router > >> > >> ^ > >> > >> Router > > Router > >> > >> | > >> | > >> > >> Router > > Router > >> > >> > >> > >> I will acknowledge that in some business cases you might place a > > router on > >> each floor or each building in a campus, but this is where things get > > blurry > >> for me - would you really use a CPE router in these cases for ingress > > into the > >> business? You certainly could, but would you? > >> > >> > >> > >> Given that, I think that defining how many routers exist behind this > > CPE > >> ingress router will provide us with a reasonable place from which to > > define > >> the needs and requirements for an IGP running in the home. > >> > >> > >> > >> Dan > >> > >> _______________________________________________ v6ops mailing list > >> [email protected] https://www.ietf.org/mailman/listinfo/v6ops > > _______________________________________________ > > v6ops mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/v6ops > > > > _______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet >
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