Re: QOS Question

Hello,

I hope this finds you doing well.

Interesting question ... humm. If there is no congestion, then packets are
sent directly to the out tx ring and as such, no drops.

Two follow ups to this ...

If you want to drop traffic over a specific throughput, then configure
policing. You can drop traffic that exceeds your configured amount, or that
exceeds any amount you prefer. Get out the calculator Nuno, and figure out
what 20% of the total traffic is, and then configure your police rate at 20%
lower than what you are sending. Make sense? You can police at 20% lower
...

Another way to achieve queuing when there is no interface congestion, is to
use shaping. Shaping will create some delay to the traffic flows and use
buffers / software queuing. This is not really related to your question
about drops, however when you need to send at a rate less than your
interface, then shaping is your best option.

HTH,

Andrew Lee Lissitz

On Wed, Dec 30, 2009 at 9:29 AM, Nuno Reis <nreis_at_regra.pt> wrote:

> Hi all,
>
> Is there any way of causing packet drops using qos mechanism, i.e causing
> 20% packet loss even if there is no congestion. WRED?
>
> Thanks,
> Nuno Reis
>
>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net