Re: [Diffserv] SLA & admission control in DiffServ
SERBAN Rares <serban_rares@yahoo.com> Thu, 28 November 2002 10:19 UTC
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Date: Thu, 28 Nov 2002 02:02:17 -0800
From: SERBAN Rares <serban_rares@yahoo.com>
Subject: Re: [Diffserv] SLA & admission control in DiffServ
To: Brian E Carpenter <brian@hursley.ibm.com>, Amoakoh Gyasi-Agyei <amoakoh@eleceng.adelaide.edu.au>
Cc: diffserv@ietf.org
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I have a question: Which part from Diffserv SLA could be negotiated in the case of Dynamic SLA? Which are the funcionalities from Diffserv involved in this negociation/re-negotiation? Thank you, R. --- Brian E Carpenter <brian@hursley.ibm.com> wrote: > Would you sign a contract to guarantee bandwidth on > a variable > bandwidth network? I wouldn't, so what you are > describing is > an SLA that should never exist. > > I don't know what a dynamic SLA is. We certainly > don't have any > standards for such things. > > You might well have rate control in a source, > admission control > in an ingress router, and policing in a downstream > router. > I suggest you read RFC 3086 and RFC 3290. > > Brian > > Amoakoh Gyasi-Agyei wrote: > > > > Hi, > > > > Should the SLA be static or dynamically > negotiated? Assuming a static SLA with bandwidth > limit, how can the service provider guarantee the > > SLA on a connection with a wireless component > which is spatio-temporarily varying and whose > bandwidth can degrade ungraciously? What is > > the need to differentiate a policer from an > admission controller? > > > > So, Brian, do you mean that the admission > controller in this case will operate in the traffic > source while the policer sits somewhere else > > or be integrated? I just do not know why and how > some of these functionalities were separated > although their functionalities appear to be > > very similar, if not identical. > > > > Thanks, > > Amoakoh > > > > > > > > Message: 3 > > > Date: Wed, 27 Nov 2002 17:17:57 +0100 > > > From: Brian E Carpenter <brian@hursley.ibm.com> > > > Organization: IBM > > > To: Geunhyung Kim <geunkim@postech.ac.kr> > > > Cc: diffserv <diffserv@ietf.org> > > > Subject: Re: [Diffserv] SLA & admission control > > > > > > It depends on the PDB in use. If it has a > bandwidth limit, > > > then ingress policing will be used to discard > excess traffic. > > > In this case, it may be desirable to apply > admission control, > > > rather than let the policing throw traffic away. > Actually, > > > that is something that the SLA should specify. > > > > > > Brian > > > > > > Geunhyung Kim wrote: > > > > > > > > Hello, All, > > > > > > > > I have some confusion about the SLA and > admission control. > > > > When the provider contracts the SLA with the > customer > > > > - the provide check if the network can > support the SLA and the provider make the contract > when the SLA can be supported. > > > > > > > > As far as I know, when the SLA mechanism is > used in the DiffServ domain, the admission control > mechanism is not required, I thought. > > > > Is my thought correct ? > > > > If not, please let me know why the admission > control is required after SLA is entered into > agreement. > > > > > > > > Thanks in advance, > > > > > > > > Geunhyung Kim > > > > > > > > None of us is as smart as all of us > > > > ========================================== > > > > Geunhyung Kim > > > > > > > > E-mail: geunkim@postech.edu > > > > > > > > Tel: +82-54-279-5655 > > > > Fax: +82-54-279-5699 > > > > > > > > Networking & Distributed Systems Lab. > > > > CSE > > > > POSTECH > > > > > > > > _______________________________________________________ > > Amoakoh Gyasi-Agyei > > Centre for Internet Technology Research (CITR) > > Electrical & Electronic Engineering Department > > Adelaide University > > Tel: +61 8 8303 6209 (office) > > Tel: +61 402 638 141 (mbl) > > Fax: +61 8 8303 4405 > > > http://aaron.eleceng.adelaide.edu.au/Personal/amoakoh/ > > -- > - - - - - - - - - - - - - - - - - - - - - - - - - - > - - - - - - - > Brian E Carpenter > Distinguished Engineer, Internet Standards & > Technology, IBM > On assignment at the IBM Zurich Laboratory, > Switzerland > _______________________________________________ > diffserv mailing list > diffserv@ietf.org > https://www1.ietf.org/mailman/listinfo/diffserv > Archive: > http://www.ietf.org/mail-archive/working-groups/diffserv/current/maillist.html > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com _______________________________________________ diffserv mailing list diffserv@ietf.org https://www1.ietf.org/mailman/listinfo/diffserv Archive: http://www.ietf.org/mail-archive/working-groups/diffserv/current/maillist.html
- [Diffserv] SLA & admission control in DiffServ Amoakoh Gyasi-Agyei
- Re: [Diffserv] SLA & admission control in DiffServ Brian E Carpenter
- Re: [Diffserv] SLA & admission control in DiffServ SERBAN Rares