From: Huan Pham (huan.pham@valuenet.com.au)
Date: Sun Jan 13 2008 - 23:14:43 ARST
Hi Frog,
Policing implements the upper limit, and not the guaranteed minimum
bandwidth. For instance,
class a
police CIR 10MB BC 1MB
does not "reserve" or "allocate" 10M+1M for class A. Any "unused" bandwidth
is of cause can be used by other classes.
> Q1:
> If class A is using only 5 megs of badwidth of its allocated 10mb
> bandwidth (+1megs bc), where that bandwidth will go ? in default-class?
I assume your policing action is dropping for exceeding traffic. Then,
whether or not class A uses maximum 10M defined for it or just 5M, all the
total bandwidth (e.g. 20M Access rate) will still be able to be used by all
other classes, including the default. By this I mean, classes can congest
each other if you do not implement CBWFQ, where a minimum reserved bandwidth
for each class is defined.
> Q2:
> If answer of Q1 is "yes" - Can class B use classA's spare bandwidth (from
> default-class) and can be benifited bursting 1 megs?
Class B does not benefit from the bursting 1Mbps defined for class A. The
bursting value applied to class A only.
Whether or not you have 10M max rate, or just 5M max for class A, by default
class B (without any policing rule applied for it specifically) can burst to
the full access rate.
Let me know if I understand your questions correctly, and if I answered
them.
Cheers,
Huan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Radioactive Frog
Sent: Saturday, 12 January 2008 11:26 PM
To: Group study
Subject: Re: policing again
forgot to add,
Shapping is not an option.
Using policing how can we utilize the bandwidth efficiently e.g. if class a
is not using allocated bandwidth , then other class should be able to use
it.
cheers
On Jan 12, 2008 11:00 PM, Radioactive Frog <pbhatkoti@gmail.com> wrote:
> Hi group,
> I have a basic question which is bugging me for quite a sometime.
>
> policy-map test
> class a
> police CIR 10MB BC 1MB
> class b
> police CIR 8MB bc 1MB
>
> Interface fast0/0
> service-policy input test
> service-policy output test
>
> Q1:
> If class A is using only 5 megs of badwidth of its allocated 10mb
> bandwidth (+1megs bc), where that bandwidth will go ? in default-class?
>
> Q2:
> If answer of Q1 is "yes" - Can class B use classA's spare bandwidth (from
> default-class) and can be benifited bursting 1 megs?
>
> All i want to know is , how does policing treats when any class spares its
> bandwidth.
>
> Thanks
> frog
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