From: maureen schaar (maureen.schaar@gmail.com)
Date: Sun Mar 25 2007 - 10:39:08 ART
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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