Re: [NSIS] QSPEC Questions
Elwyn Davies <elwynd@dial.pipex.com> Sun, 02 November 2008 10:09 UTC
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Date: Sun, 02 Nov 2008 10:14:07 +0000
From: Elwyn Davies <elwynd@dial.pipex.com>
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To: Hannes Tschofenig <Hannes.Tschofenig@gmx.net>
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Subject: Re: [NSIS] QSPEC Questions
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Hannes Tschofenig wrote: > Based on Dan's AD review comments for draft-ietf-dime-qos-parameters-06 I > need to ask a few questions regarding the QSPEC draft: > > * There is no description of the differences between TMOD-1 and TMOD-2. > Useful to say something about the difference? The reason for two TMODs given in the Qspec draft is (from s3.3.1): Two TMOD parameters are defined in Section 5, <TMOD-1> and <TMOD-2>, where the second (<TMOD-2>) parameter is specified as could be needed to support some DiffServ applications. For example, it is typically assumed that DiffServ EF traffic is shaped at the ingress by a single rate token bucket. Therefore, a single TMOD parameter is sufficient to signal DiffServ EF traffic. However, for DiffServ AF traffic two sets of token bucket parameters are needed, one token bucket for the average traffic and one token bucket for the burst traffic. [RFC2697] defines a Single Rate Three Color Marker (srTCM), which meters a traffic stream and marks its packets according to three traffic parameters, Committed Information Rate (CIR), Committed Burst Size (CBS), and Excess Burst Size (EBS), to be either green, yellow, or red. A packet is marked green if it does not exceed the CBS, yellow if it does exceed the CBS, but not the EBS, and red otherwise. [RFC2697] defines specific procedures using two token buckets that run at the same rate. Therefore 2 TMOD parameters are sufficient to distinguish among 3 levels of drop precedence. An example is also described in the Appendix to [RFC2597]. A piece of this probably needs to be in the dime doc. > > > * Where does the description for <Path Jitter>, <Path PLR> and <Path PER> > come from? There is no reference to another RFC given in these sections. > > * Why is Path Jitter STAT4(Reserved) included in the <Path Jitter> > parameter? > > * The encoding of the <RPH Priority> Parameter is not inline with > http://tools.ietf.org/id/draft-ietf-tsvwg-emergency-rsvp-09.txt. The ALRP > Priority and the Reserved octets > positions are inversed. > > * <DSTE Class Type> Parameter > > The QSPEC draft says: > " > DSTE Class Type: Indicates the DSTE class type. Values currently > allowed are 0, 1, 2, 3, 4, 5, 6, 7. > " > > RFC 4124 does not define a value of 0. Where does 0 come from? > In RFC 4124 the field is only 3 bits long. Why is it 8 bytes long in the > QSPEC document? > Technically 0 is reserved in RFC4124. This probably ought to be reproduced in the Qspec and DIME docs. I take it you meant 8 bits long. Actually, the CLASSTYPE is 32 bits in RFC4124 with 29 bits reserved. In practice it seems unlikely any extra classes will be defined so the different definitions are unlikely to cause issues, but given that each TLV has 32 bits it might have been sensible to match the RFC4124 definition. I note that RFC 4124 does not offer an IANA registry for DSTE values: But the Qspec and DIME docs generate two separate registries. Since the meanings are supposed to be common this doesn't make a lot of sense. This may apply to other Qspec and DIME registries. /Elwyn > Your feedback is appreciated! > > Ciao > Hannes > > _______________________________________________ > nsis mailing list > nsis@ietf.org > https://www.ietf.org/mailman/listinfo/nsis > > _______________________________________________ nsis mailing list nsis@ietf.org https://www.ietf.org/mailman/listinfo/nsis
- [NSIS] QSPEC Questions Hannes Tschofenig
- Re: [NSIS] QSPEC Questions Xiaoming Fu
- Re: [NSIS] QSPEC Questions Elwyn Davies
- Re: [NSIS] QSPEC Questions Elwyn Davies
- Re: [NSIS] QSPEC Questions Gerald Ash
- Re: [NSIS] QSPEC Questions Gerald Ash
- Re: [NSIS] QSPEC Questions Al Morton
- Re: [NSIS] QSPEC Questions Hannes Tschofenig
- Re: [NSIS] QSPEC Questions Al Morton
- Re: [NSIS] QSPEC Questions Hannes Tschofenig
- Re: [NSIS] QSPEC Questions Hannes Tschofenig