Re: [Diffserv-interest] Re: Diffserv-interest digest, Vol 1 #113 - 3 msgs

Brian E Carpenter <brc@zurich.ibm.com> Fri, 14 November 2003 13:45 UTC

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Date: Fri, 14 Nov 2003 14:43:08 +0100
From: Brian E Carpenter <brc@zurich.ibm.com>
Organization: IBM
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To: Jing Shen <jshen_cad@yahoo.com.cn>, diffserv-interest@ietf.org
Subject: Re: [Diffserv-interest] Re: Diffserv-interest digest, Vol 1 #113 - 3 msgs
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Whether a service class is over provisioned or under provisioned
(i.e. overbooked) is just an operational choice by the ISP.
For a PDB built using the EF PHB, it would be bizarre to
under-provision, but for the class selector PHBs, the default
PHB, or an AF class, under-provisioning would be a possible
choice. In fact, in a diffserv deployment, I would expect the
default PDB to be under-provisioned - otehrwise, there would
be little reason to offer "better than default" PDBs.

   Brian

Jing Shen wrote:
> 
> I'm not so clear with "overbooking" in DiffServ
> network. To my understanding, there will be no
> end-to-end explicit bandwidth allocation in DiffServ
> Networks. At that of current IP network, ISP just
> provides internet access to customers and core network
> is overprovisioned to guarantee service quality.  So,
> to my expection "logical Golden Service Network" in
> DiffServ will not has explict e2e tunnel at all. Where
> comes overbooking?
> 
>  --- "John H. Shuler" <johnshuler@mac.com> µÄÕýÎÄ£º>
> Brian,
> >
> > I agree. My suggestion would be to keep it simple so
> > as to be easily
> > implemented as a common denominator standard that
> > works, then refine it over
> > time after experience demonstrates a need. If it
> > starts out too complicated,
> > it will be too expensive to implement and therefore
> > usurp the purpose.
> >
> 
> =====
> Jing Shen
> 
> Data Communication Center
> HangZhou TeleCom
> HangZhou ZJ 310027
> P.R.China
> 
> ' spamcontrol '
> 
> __________________________________________________
> Do You Yahoo!?
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> http://mail.yahoo.com

-- 
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Brian E Carpenter 
Distinguished Engineer, Internet Standards & Technology, IBM 

NEW ADDRESS <brc@zurich.ibm.com> PLEASE UPDATE ADDRESS BOOK

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