From: Herbert Maosa (asawilunda@googlemail.com)
Date: Mon Nov 26 2007 - 09:30:23 ART
It really depends on what you are trying to do. Using an agregate shaper (
the one you put on the parent policy map in class class-default ), you shape
all traffic ( all classes ) to one shaping rate. if you individually shape
the classes, then your classes will not benefit from bursting into unused
bandwidth on the access. So Telnet traffic in your example will always be
peaked at 384, even if there was no HTTP traffic flowing, making the 128Kbps
available. If you used the agregate shaper here, then either class can burst
up to 512K if the bandwidth is available. If the bandwidth is not available,
then you guarantee that at least the amount specified as *bandwidth
*or *priority
*will be delivered, at a minimum
So, again, it depends on how you want the traffic to be treated. The
configuration will permit you to do either way.
My 2 pence worth.
Herbert.
On Nov 26, 2007 9:32 AM, Joseph Brunner <joe@affirmedsystems.com> wrote:
> Let me see...
>
> >bandwidth 128 or priority 128
>
> Just be aware "bandwidth" deals with contention and gives reservation in
> times of high utilization. "Priority" will POLICE (drop) to prevent
> starvation. Don't know which behavior you're after.
>
> >Generally we use nested policy maps if we have to shape all the traffic
> >along with the prioritization of some type of traffic
>
> If we are providing a queue where no queue exists too, such as a sub-if
> (thanks SM!)
>
> You're example will work on main interface frame relay.
>
> Show frame pvc xxx
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Gupta, Gopal (NWCC)
> Sent: Monday, November 26, 2007 1:19 AM
> To: Cisco certification
> Subject: Is this mandatory to do NESTING of Policy
>
> Hi Folks,
>
> Generally we use nested policy maps if we have to shape all the traffic
> along with the prioritization of some type of traffic. correct??
>
> but we can do this w/o nesting as well
>
> e.g
>
> policy-map SHAPE+MIN_BW
> class HTTP
> bandwidth 128 or priority 128
> shape average 512000
>
> class TELNET
> bandwidth 384
> shape average 512000
>
> Interface s1/0
> service-policy output SHAPE+MIN_BW
>
> Assuming our frame-relay interface has 512 Kbps CIR.
> My question is can we achieve same thing without using nesting, like the
> above example ????
>
> Thanks
> Gops
>
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