Re: Need help in QOS

Hi,

On Sun, May 17, 2009 at 2:25 AM, hafiz atif <oops.com_at_gmail.com> wrote:
>
> I have an ethernet link of 8 mbps, i have different customers and i need to
> apply the qos to gaurantee minimum bandwidth for each customer. Now the
> problem i am facing is: the bandwidth command will only take effect during
> congestion, but in my case the link will not be congested as i have gig
> interface so the bandwidth feature will not take affect. What i have done
> is: I have made nested polices, in the parent policy i have shaped the
> traffic to 8 mbps and in the child policy i have configured bandwidth for
> different customers which is working fine. But this solution is not scalable
> as i can only configure 8 class-maps in child policy and the number of
> customers i am expecting is much more. please advice!

I think you're on the right track with the parent shaper / child queuer setup..

> Router: ASR1000
> IOS: 12.233

..but I'm not familiar with the ASR enough to advise exactly what the
best solution is, config-wise.

The reason I'm replying at all, is to ask if you're able to nail the
link speed to 10Mbps instead of 1Gbps. If your upstream is policing
you to 8Mbps, you would probably get a 'smoother' result with shaping
by limiting the actual transmit rate.

It's also useful in these situations to have a deep understanding of
exactly how your upstream is policing you -- i.e. what parameters
their policer is using, how much you can burst (if at all), and so on.
With such a big difference in committed rate vs access rate, you have
huge potential to burst waaaaay above your subscribed rate.

For what it's worth, I've seen similar questions asked on other lists,
and while I can't vouch for them personally, the Service Control
Engines are often recommended for serious shaping scenarios in service
provider networks.

http://www.cisco.com/en/US/products/ps7045/index.html

cheers,
Dale

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Received on Sun May 17 2009 - 10:13:18 ART