Re: [Diffserv-interest] size of a DiffServ domain

Brian E Carpenter <brian@hursley.ibm.com> Mon, 27 August 2001 16:52 UTC

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Date: Mon, 27 Aug 2001 11:49:10 -0500
From: Brian E Carpenter <brian@hursley.ibm.com>
Organization: IBM
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To: Jaeyoung Kim <jay@enisei.postech.ac.kr>
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Subject: Re: [Diffserv-interest] size of a DiffServ domain
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Jaeyoung Kim wrote:
> 
> On Mon, Aug 27, 2001 at 09:10:12AM -0500, Aaron D Striegel wrote:
> > I think Jaeyoung might have meant to inquire what a typical size was
> > as opposed to a proper size in order to have a practical foundation for
> > simulations.
> >
> > Aaron
> >
> > At 12:47 PM 8/27/2001 +0200, Marcus Brunner wrote:
> > >Yes, DiffServ itself is scalable, however, don't forget the
> > management/control systems (e.g., bandwidth bokers etc.). Depending on the
> > architecture, the services you want to provide, and the number of customers
> > you want to service, the mgt systems might be a bottleneck.
> > >
> > >Marcus
> 
> Thank you, Aaron and Marcus, for clarifying what I meant in my previous
> question. Theoretically, Mr. Carpenter's comment is correct. Absolutely
> I agree on that DiffServ is scalable.
> 
> However, when it comes to managing DiffServ networks, it is good to have
> information in advance on how big the network of concern is. Although
> there is no theoretical limitation on the size of DiffServ domain, my
> intuition is saying that a practical size of one DiffServ domain will not
> be over a size of 50 routers. Besides, the number of edge routers might
> be less than 10 or 15.

These numbers seem low to me. 50 routers is not even a large sized campus
network, let alone a backbone.

> 
> This estimation is important when devising simulation scenarios which
> are as realistic as possible.

Indeed. It would be very interesting to know the size-dependency
as well - do the statistics look different as the network gets bigger?

   Brian

> 
> I think it is helpful if I know the actual size of network domains of
> some big backbone network providers. Anybody?
> 
> Anyway, thank you for your valuable comments.
> 
> Sincerely,
> Jay Kim
> 
> --
> ============================================================================
>  __/\__ ** Remember Yesterday, Dream about Tomorrow, but ... LIVE TODAY !!!
>  \ /\ / -------------------------------------------------------------------
>  /_\/_\ ** jay@postech.ac.kr                 http://home.postech.ac.kr/~jay
>    \/   ** Jaeyoung Kim      Computer Science & Engineering, POSTECH, KOREA
> 
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-- 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Brian E Carpenter 
Distinguished Engineer, Internet Standards & Technology, IBM 
On assignment for IBM at http://www.iCAIR.org 
Board Chairman, Internet Society http://www.isoc.org

"We shall need a number of efficient librarian types 
 to keep us in order." - Alan Turing, 1947.

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