Re: [NSIS] QSPEC Questions
"Hannes Tschofenig" <Hannes.Tschofenig@gmx.net> Sat, 08 November 2008 15:28 UTC
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From: Hannes Tschofenig <Hannes.Tschofenig@gmx.net>
To: 'Elwyn Davies' <elwynd@dial.pipex.com>
References: <00ff01c93c55$b62dee80$04ffa8c0@nsnintra.net> <490D7D6F.3000502@dial.pipex.com>
Date: Sat, 08 Nov 2008 17:27:49 +0200
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Subject: Re: [NSIS] QSPEC Questions
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Hi Elwyn, Thanks for your feedback. >-----Original Message----- >From: Elwyn Davies [mailto:elwynd@dial.pipex.com] >Sent: 02 November, 2008 12:14 >To: Hannes Tschofenig >Cc: nsis@ietf.org >Subject: Re: [NSIS] QSPEC Questions > > > >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. > I wonder how I was able to have missed that description. >> >> >> * 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 have changed the description in the DIME document to use the RFC 4124 CLASSTYPE as is. > >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. I removed the registry for the DSTE Class Types from the DIME document. When someone registers new values then they have to think about the definition of registering a new QoS parameter, if necessary. Since these QoS parameters aren't registered too frequently I don't expect too many actions. Ciao Hannes > >/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