[Diffserv-interest] Re: [NSIS] PPS and MF-PHB
Roland Bless <bless@tm.uka.de> Mon, 10 November 2003 23:40 UTC
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Date: Tue, 11 Nov 2003 00:38:55 +0100
From: Roland Bless <bless@tm.uka.de>
To: "MORITA, Naotaka" <morita.naotaka@lab.ntt.co.jp>
Cc: diffserv-interest@ietf.org, "'tsvwg@ietf.org'" <tsvwg@ietf.org>
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Organization: Institute of Telematics, University of Karlsruhe
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Subject: [Diffserv-interest] Re: [NSIS] PPS and MF-PHB
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Hi Naotaka, On Fri, 07 Nov 2003 09:36:44 +0900 "MORITA, Naotaka" <morita.naotaka@lab.ntt.co.jp> wrote: > I would like to draw QoS experts attention to the following three documents. > > http://www.ietf.org/internet-drafts/draft-morita-tsvwg-pps-01.txt > http://www.ietf.org/internet-drafts/draft-morita-tsvwg-mfphb-00.txt > http://www.ietf.org/internet-drafts/draft-morita-tsvwg-mfverify-00.txt > > I am going to make a presentation on Monday morning at TSV WG. After reading draft-morita-tsvwg-mfphb-00.txt and attending your presentation, I have some remarks related to this approach: - I'm not quite sure whether this is really a PHB definition. It seems to me, that it is actually a mix of * a scheme for measured-based admission control and resource provisioning * a Per-Domain Behavior (see RFC 3086) * a PHB group description - The scheme inherently relies on feedback information and it should be made clear how the feedback can be provided (you mentioned RTCP as an example, what about others?). - Instead of defining a new PHB, possibly two Class Selector PHBs or even an AF class can be used ("green" packets get high priority after admission control, "yellow" and "red" packet may be used for probing). AF usually gives no guarantees for delay and jitter, however, if AF is provisioned properly, "green" packets may get some guarantee. - For security and robustness, it is essential to police the markings for the higher priority. Otherwise the service guarantees for other users are violated by a malicious or ill-behaving end-system. Therefore, I think first-hop routers should do the policing (based on the feedback information?). - I see some value in the overall approach, but IMHO the proposal may be turned into a description for a measurement-based admission control scheme and PDB using Class Selector PHBs. I copied to the relevant lists (diffserv-interest and tsvwg) as I'm interested in other opinions. Best regards, Roland _______________________________________________ Diffserv-interest mailing list Diffserv-interest@ietf.org https://www1.ietf.org/mailman/listinfo/diffserv-interest
- [Diffserv-interest] Re: [NSIS] PPS and MF-PHB Roland Bless
- [Diffserv-interest] Re: [Tsvwg] Re: [NSIS] PPS an… Roland Bless
- [Diffserv-interest] Re: [Tsvwg] Re: [NSIS] PPS an… MORITA, Naotaka
- [Diffserv-interest] Re: [Tsvwg] Re: [NSIS] PPS an… MORITA, Naotaka
- Re: [Diffserv-interest] Re: [Tsvwg] Re: [NSIS] PP… Roland Bless