From: Venkatesh Venkatesh (kvpalani@gmail.com)
Date: Fri Nov 17 2006 - 15:59:14 ART
Shaping- making use of your MONEY :-) why would you drop the packet when
there are some latency-tolerable applications that could use this ...
whether you want to shape or police is absolutley depending on the
requirement..for example some warehouses may run just backup in that case
shaping is very good and advantageous compared to policing, at the same time
as a service provider ability to shape on the inbound traffic is not
possible unless you have GSR or some other hardware that supports ingress
shaping so they just police....
- Venkatesh
On 11/17/06, SAVJANI, HITESH, WWCS <hitesh@att.com> wrote:
>
> John,
>
> I see your point. However think about it this way. Shaping doesn't
> necessarily drop the traffic however policing does. Shaping would drop
> the traffic only if you are really flooding the traffic & buffer can't
> hold it in the output queue. You configure shaping to slow down the
> trasmit rate so that your provider will not drop your excessive traffic.
> If you don't slow down/shape, your non tcp applications may experience
> some issues. Your time sensitive applications will scream at you as
> well. This is the reason I think I would configure shaping.
>
> My 2 cents.
>
> Regards,
>
> Hitesh Savjani
> CCIE # 17151
>
>
> ________________________________
>
> From: John Moor [mailto:johmoor@gmail.com]
> Sent: Friday, November 17, 2006 11:28 AM
> To: SAVJANI, HITESH, WWCS; Cisco certification
> Subject: Re: shaping vs policing real life
>
>
>
>
> On 11/17/06, John Moor <johmoor@gmail.com> wrote:
>
> Yes guys I know this consideration about TCP sessions drop and
> slow down. The thing which does interest me the most is:
>
> 1) How much could this imact the network. How much benefit/speed
> anything else we can get when using shaping instead of policing for
> outside traffic on the outside interface of the customer network?? Are
> there some applications which would very much depend on what is
> configured shaping or policing?? Some examples...
>
>
> P.S To SavJani: If we don't want dorp our own traffic we
> wouldn't configured anything either policing or shaping correct??? From
> this I would probably formulate following subquestion:
>
> What could be bad.... if we do not configure shaping at all on
> the outside interface?? Say Provider have configured policing and we
> didn't configure anything...
>
>
>
> On 11/17/06, SAVJANI, HITESH, WWCS <hitesh@att.com > wrote:
>
> John,
>
> Here is the way I understand.
>
> 1 Shaping on the enterprise edge : Being a customer we
> would want to
> push as much data as we can without dropping anything.
> If we use
> policing we will be droping our own traffic which will
> not make any
> sense. Will it?
>
> 2 Policing on the Provider edge : Being a service
> provider, I wouldn't
> want to allow my customer to send anything more than he
> is paying for.
> So, I will drop anything above the limit. Another reason
> is sometimes
> being a provider I will sell my 100 Mb pipe as 200 Mb
> ;-). It does
> happen & is called oversubscribing. In this case I would
> definitely want
> my customer to stick to his allocated bandwidth.
>
> Shaping should be used when you don't want traffic to
> get dropped.
> Policing will drop all the traffic which is more than
> the value
> configured. I would not suggest to use policing on an
> interface going to
> the provider. However you may want to use policing
> inbound on that same
> interface. It's all based on what you want to
> accomplish.
>
> HTH,
>
> Hitesh Savjani
> CCIE # 17151
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:
> nobody@groupstudy.com] On Behalf Of
> John Moor
> Sent: Friday, November 17, 2006 9:51 AM
> To: Cisco certification
> Subject: shaping vs policing real life
>
> Hello guys,
>
> 1. We all know the difference between policing and
> shaping (how they
> drop
> the packets). Also usually in the real life policing is
> configured on
> the
> provider edge and shaping is configured on the customer
> edge.
>
> 2. Guys could you please explain me why do we use
> shaping on the
> enterprise
> edge and not policing. Could you please give me a couple
> of real life
> theoretical examples when it could be logically
> explained why using
> shaping
> is much better than using policing??
>
> Thanks,
>
>
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