Re: [Roll] [6man] #6 (draft-thubert-6man-flow-label-for-rpl): draft-thubert-6man-flow-label-for-rpl-03 Updates: 6437 (if approved) - add section with explanation
"6man issue tracker" <trac+6man@trac.tools.ietf.org> Tue, 12 August 2014 06:21 UTC
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Subject: Re: [Roll] [6man] #6 (draft-thubert-6man-flow-label-for-rpl): draft-thubert-6man-flow-label-for-rpl-03 Updates: 6437 (if approved) - add section with explanation
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#6: draft-thubert-6man-flow-label-for-rpl-03 Updates: 6437 (if approved) - add section with explanation Comment (by mariainesrobles@gmail.com): Source: http://www.ietf.org/mail-archive/web/ipv6/current/msg21030.html From: Carsten Bormann <cabo at tzi.org> Date: Sun, 10 Aug 2014 18:29:01 +0200 So far, we have mainly discussed the need for an optimization (it seems we now agree there is a need) and the interaction between the normative components of RFC 6437 and those of the draft at hand. I’d now like to bring up a different question: Is this the right approach? I have written up what appears to be a more natural approach in the strawman draft: http://tools.ietf.org/html/draft-bormann-6lo-rpl-mesh-00 Why are we doing the flow-label thing and not the more natural thing? [ ] because the flow label hack works on packets that leave the 6lo networks. • but do we really need to optimize this on the non-6lo networks? [ ] because the flow label hack has been around for a while and is now cast in stone. • is it? [ ] because there is a flaw with the way this has been integrated into the 6lo framework. • ______ (fill in the flaw) [ ] because ______ (fill in the reason) Inquiring minds want to know. Grüße, Carsten -------------------------------------- Source: http://www.ietf.org/mail-archive/web/ipv6/current/msg21034.html From: "Pascal Thubert (pthubert)" <pthubert at cisco.com> Date: Sun, 10 Aug 2014 17:05:34 +0000 Hi Carsten I think you jumped too quickly on my suggestion at 6lo. It makes a lot of sense to work on a 6lo routing dispatch and in particular enable the compression of all RPL artifacts. It will take some time to figure out what goes in there but my suggestion at 6lo includes routing header compression, RPL option, but also source destination if we decide to route fragments. I hope this happens and I'll see with Laurent if we use a respin of his draft or I start a new one. This work will be beneficial in the long run, but doubly fails to address the issues at stake here: - the draft proposes to update the rules in 6437 with stateful and with domain scoped operations. This is used by the draft itself but also by published and deployed standards that came up before 6437 (eg ISA100.11a) and we are now acknowledging and legalizing a de facto situation. - it will take a year or 2 at best to agree on the new routing dispatch and its operation. We need an improvement now. And btw we cannot necessarily assume 6lo together with RPL, I know of at least one RPL implementation that does not use that compression. Finally, Using a dispatch for the RPL option alone seems like a waste, but that is a discussion for 6lo. I'll publish there when I'm back from vacations. Cheers, Pascal --------------------------------------------------- Source: http://www.ietf.org/mail-archive/web/ipv6/current/msg21036.html From: Carsten Bormann <cabo at tzi.org> Date: Sun, 10 Aug 2014 21:07:04 +0200 On 10 Aug 2014, at 19:05, Pascal Thubert (pthubert) <pthubert at cisco.com> wrote: > - it will take a year or 2 at best to agree on the new routing dispatch and its operation. We need an improvement now. And btw we cannot necessarily assume 6lo together with RPL, I know of at least one RPL implementation that does not use that compression. I don’t understand why we can’t do the saner equivalent of the flow label hack now and come up with a source routing header (which is not covered by the flow label hack) later. Please tell us more about how ISA100.11a uses the flow label; that is information that has been lacking from the discussion so far. Grüße, Carsten ------------------------------------------------------ Source: http://www.ietf.org/mail-archive/web/ipv6/current/msg21039.html From: Ole Troan <otroan at employees.org> Date: Mon, 11 Aug 2014 15:54:35 +0200 > I *really* don't think RFCs are algorithms to the point where we > need to do this. I see no reason why flow-label-for-rpl can't simply > declare itself an exception to this clause of RFC 6437. I must admit I'm uncomfortable with this draft and its approach. how can we be sure that we aren't opening a Pandora's box? I'm worried that we set a precedence, and we'll see a new set of creative proposals for the use of these 20 bits. cheers, Ole ------------------------------ Source: http://www.ietf.org/mail-archive/web/ipv6/current/msg21040.html From: Brian E Carpenter <brian.e.carpenter at gmail.com> Date: Tue, 12 Aug 2014 08:26:19 +1200 Well, that has been the case for a long time: see RFC 6294. I see the concern. Actually that's why I don't want to see a formal update to 6437, because the only rational update would be to allow any closed domain to invent its own usage. We had that argument at length during the development of 6437, and decided against it. Therefore, treating RPL as a special case is the remaining option. But does the ROLL community actually have consensus that they want this special case? Brian -- -------------------------------------------------+------------------------- Reporter: mariainesrobles@gmail.com | Owner: Type: defect | pthubert@cisco.com Priority: major | Status: new Component: draft-thubert-6man-flow-label-for- | Milestone: rpl | Version: Severity: In WG Last Call | Resolution: Keywords: | -------------------------------------------------+------------------------- Ticket URL: <http://trac.tools.ietf.org/wg/6man/trac/ticket/6#comment:2> 6man <http://tools.ietf.org/wg/6man/>
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