RE: Is this mandatory to do NESTING of Policy

From: Gupta, Gopal (NWCC) (gopal.gupta@hp.com)
Date: Mon Nov 26 2007 - 11:32:05 ART

Nice explaination, but could you tell me why is it so, that Telnet
traffic in your example will always be peaked at 384????and not use
shape average....

Many Thanks
Gops

________________________________

From: Herbert Maosa [mailto:asawilunda@googlemail.com]
Sent: Monday, November 26, 2007 18:00
To: Joseph Brunner
Cc: Gupta, Gopal (NWCC); Cisco certification
Subject: Re: Is this mandatory to do NESTING of Policy

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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