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 (PST)
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
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>
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> 


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