Re: QOS Question

what type of router is it? how many PPS are being sent?
sometimes the router can be overloaded in other ways other then pure
bit's per second.

also how are you measuring the amount of traffic being sent/congestion?
depending on the type of traffic flow you may actually have congestion
but on the 30 second or by default 5 minute measuring interval on a
Cisco router
you may not see it as congestion.

Ben

On Wed, Dec 30, 2009 at 11:58 AM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:
> 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
>
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Received on Wed Dec 30 2009 - 15:48:41 ART