From: Huang Laurence (huangyinxiao@gmail.com)
Date: Sun Mar 25 2007 - 22:46:30 ART
Thanks pierre and maureen, it is very clear to me.
Cheers,
Laurence
On 25/03/07, maureen schaar <maureen.schaar@gmail.com> wrote:
>
> With bandwidth, you provide minimal bandwidth guarantee, but no upper
> limit!
>
> With shaping and policing, the same things can be accomplished: limit
> traffic. They differ in the way excess traffic is handled, like
> pierre-alex stated (buffered or dropped/remarked).
>
> Here is an example of a shaping and policing configuration that
> provide similar functionality (provide strict upper limit without
> allowing excess traffic).
>
> Example:
>
> policy-map SHAPE
> class class-default
> shape average 25600 32000 0
>
> is similar to:
>
> policy-map POLICE
> class class-default
> police 256000 32000
>
> (Bc = 0.125 * 256000)
>
> If they mention something about excess traffic and drop
> characteristics, that should point out if you should choose shaping or
> policing.
>
> Maureen
>
> On 3/24/07, Pierre-Alex <paguanel@hotmail.com> wrote:
> > Hi Laurence,
> >
> > Both police and shape can limit traffic to 256Kbps
> >
> > With police you will drop excess traffic.
> >
> > With shape you will buffer it (delay it ).
> >
> > So you will need additional information to decide which one to use.
> >
> > The keyword bandwidth should be used, when they asked you to "guarantee"
> > bandwidth
> >
> > HTH
> >
> > Pierre-Alex
> >
> >
> > ----- Original Message -----
> > From: <huangyinxiao@gmail.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Friday, March 23, 2007 2:33 PM
> > Subject: QOS problems
> >
> >
> > > Hi group,
> > >
> > > I am very confusing about how to use the keyword "bandwidth, police,
> > shape" when I am doing QOS questions.
> > >
> > > In what situation can I use those key words respectively when I put it
> on
> > class map.
> > >
> > > For example, When question ask me to limit traffic by 256kpbs, what
> key
> > words should I use in class map,police? bandwidth? shape? ...
> > > #class TEST
> > > #police 256000
> > >
> > > Thanks for any reply.
> > >
> > > Cheers,
> > >
> > > Laurence
> > >
> > >
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