Re: [Roll] knowing which multiple metrics matter: MRHOF related questions
JP Vasseur <jpv@cisco.com> Sat, 02 June 2012 14:25 UTC
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From: JP Vasseur <jpv@cisco.com>
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Date: Sat, 02 Jun 2012 14:35:24 +0200
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "roll@ietf.org WG" <roll@ietf.org>
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Subject: Re: [Roll] knowing which multiple metrics matter: MRHOF related questions
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Agree with Pascal - for information there was a discussion about 2 years on the subject matter and there was a consensus not to try to either mix metrics/constraints (which IMO is the right thing to do even if it leads to sub-optimality or disconnected areas) or try to make use of default metrics. On May 28, 2012, at 12:04 PM, Pascal Thubert (pthubert) wrote: > Hello Micheal > >>>>>> "Pascal" == Pascal Thubert <(pthubert)" <pthubert@cisco.com>> writes: > Pascal> I think RPL does not want to take party there. The OF is a > Pascal> piece of logic to tie metrics and policies together. > > My question is: > > - do the nodes of a DODAG have to use the same metrics to pick a parent, > (and if so, how do they agree) > I think that they do not, so long as they use an algorithm (such as > MRHOF) which has certain properties. > > [Pascal] The current spec requires that all players of an instance play by the same rule, that is same OF, in order to guarantee the expected result. > The goal there was deeper than the OF, like same OF with same parameterization. MRHOF is generic and allows various incarnations, depending in the metrics; all those incarnations are to be seen as different OFs WRT to RPL 's uniqueness rule. > > Note that this rule is not for looplessness, the Rank would assure that anyway. > > > - if we had multiple RPL instances in an LLN, using different metrics, > then we would have multiple RPL Instances and DODAGs. The different > set of metrics would not co-exist in the same RPL Instance. > > [Pascal] I think we agree. An instance can use multiple metrics bound by some logic. But those metrics and that logic must be identical throughout the instance. > A different (set of) metric means a different OF even if MRHOF is behind both. > > Cheers, > > Pascal > > -- > Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works > IETF ROLL WG co-chair. http://datatracker.ietf.org/wg/roll/charter/ > > _______________________________________________ > Roll mailing list > Roll@ietf.org > https://www.ietf.org/mailman/listinfo/roll
- [Roll] knowing which multiple metrics matter: MRH… Michael Richardson
- Re: [Roll] knowing which multiple metrics matter:… Pascal Thubert (pthubert)
- Re: [Roll] knowing which multiple metrics matter:… JP Vasseur
- Re: [Roll] knowing which multiple metrics matter:… Michael Richardson
- Re: [Roll] knowing which multiple metrics matter:… Mukul Goyal
- Re: [Roll] knowing which multiple metrics matter:… Pascal Thubert (pthubert)
- Re: [Roll] knowing which multiple metrics matter:… Ralph Droms
- Re: [Roll] knowing which multiple metrics matter:… Omprakash Gnawali
- Re: [Roll] knowing which multiple metrics matter:… JP Vasseur
- Re: [Roll] knowing which multiple metrics matter:… Pascal Thubert (pthubert)
- Re: [Roll] knowing which multiple metrics matter:… Don Sturek
- Re: [Roll] knowing which multiple metrics matter:… Ralph Droms
- Re: [Roll] knowing which multiple metrics matter:… Ralph Droms
- Re: [Roll] knowing which multiple metrics matter:… Ralph Droms
- Re: [Roll] knowing which multiple metrics matter:… Mukul Goyal
- Re: [Roll] knowing which multiple metrics matter:… Pascal Thubert (pthubert)
- Re: [Roll] knowing which multiple metrics matter:… Mukul Goyal
- Re: [Roll] knowing which multiple metrics matter:… Pascal Thubert (pthubert)
- Re: [Roll] knowing which multiple metrics matter:… Mukul Goyal
- Re: [Roll] knowing which multiple metrics matter:… Mukul Goyal