RE: QoS interpretation

One of my simple rules of thumb is that if in doubt as to policing or
shaping for a particular question: policing is normally inbound, whereas
shaping is normally outbound (for the reasons provided earlier). Also, look
for the particular measurement values or rates given in the question (i.e a
reference to a Bc of 6000 or a PIR of 256kbps) as that can sometimes
indicate one way or another which methods are available.

Cheers,
 
Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
Sr. Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto: jscrivener_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Nick
Sent: Tuesday, 14 April 2009 9:49 PM
To: Gabriel
Cc: Cisco certification
Subject: Re: QoS interpretation

Thank you for you help. I see why shaping is used in this question now. :)

Nick

2009/4/15 Gabriel <mail.to.gabriel_at_gmail.com>

> You police as the provider, you shape as the customer. In these
> examples, you are the customer and the owner of BBn is the provider,
> so he is policing and you should shape.
>
> If you think about it, it makes sense this way: if you're the
> provider, you don't care what happens to the customer's excess
> traffic: you promised the customer X mbps and that's all he gets. If
> you're the customer with a policed pipe, you want to do the best you
> can to make good use of that X mbps for your most important traffic,
> so you shape to fit the rate that's being policed by the provider.
>
> -Gabriel
>
> On Tue, Apr 14, 2009 at 6:24 PM, Nick <ccieaz_at_googlemail.com> wrote:
> > Hi all,
> >
> > I still have trouble sometimes with QoS question interpretation.
> >
> > Take this example from IE lab 18
> >
> > ".... BB2 will only allow R5 to send traffic across this link at a
> maximum
> > of 2.5mpbs. BB3 will only allow R5 to send traffic into its network at a
> > maximum rate of 3mpbs"
> >
> > How should I interpret this?
> >
> > I think that you could do this with shaping, policing or bandwidth
> > statement. But which is best and why?
> >
> > Any tips would be great.
> >
> > (SG uses shaping)
> >
> > Thanks
> >
> > Nick
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
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Blogs and organic groups at http://www.ccie.net
Received on Wed Apr 15 2009 - 00:28:32 ART