From: Plukkie (plukkie@gmail.com)
Date: Wed Aug 30 2006 - 06:44:28 ART
Hi Victor,
I'm sorry to interrupt this conversation. This is quit clear, but where I'm
confused is that sometimes a task describes the normal burst (bc) in bits,
and sometimes in bps. In the router this burst is asked in bits (or bytes).
How do you map the bps to bits?
gr
On 8/30/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> Hi HaDucBinh,
>
> This is From Chris Lewis a List Member of this great GroupStudy
>
> http://www.groupstudy.com/archives/ccielab/200603/msg00203.html
>
> "Bc is just the depth of the bucket used for the policing algorithm. It is
> not an extra amount of traffic that can be continually sent."
>
> That being said, 16000 Bytes should be allowed to be sent in a Burst, that
> mean, if you only send 1 packet (Pkt) of 16000 Bytes packet that packet is
> marked as Green, or if I send 2 Pkts in T=0 and both equal to 16000 Bytes
> in
> Size, they still conform. But if 1 pkt is greater or equal to 16001 the
> packet is marked as red and ends in /dev/null by default. You can do also
> other actions.
>
> Policing calculations are driven by Pkt arrival times.
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/123tq
> r//qos_o1gt.htm#wp1084420
>
> That means that the system would add Tokens to the Bucket using the
> following formula (time between packets <which is equal to T - T1> *
> policer
> rate)/8 bytes
>
> If I send a Pkt of 16000 bytes in sec 0 then I would consume all Bytes in
> The Token Bucket, so I have to wait almost nothing because you have
> configured a Higher Cir, which would be replenish of Tokens very quick
>
> For example if I have configure this cir 8000 bps, bc 1000 bytes in one
> router, I would add 8000/8 worth token into the Token Bucket if T=1
> That means if I send a Pkt of (996 + all the headers) in time 0 and then
> wait for 1 sec and send the other both would be marker as green
>
> So I almost have to wait like 1 sec and a little bit to allow another pkt
> with a 1000 bytes of Size (or a burst of small packets in that time and
> with
> a total weight of 1000 bytes)
>
> As you can see here, there is a direct relation between the CIR
> configured,
> the BC Value and the Time the Pkt arrives
>
> I hope this make much sense now, there is a lots of fun in Policing using
> RFC 2697 and 2698, and the key here is to remember that both are metering
> systems that helps us keep the contracted CIR over a long Run.
>
> Victor.-
>
>
> -----Mensaje original-----
> De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> haducbinh
> Enviado el: Miircoles, 30 de Agosto de 2006 12:26 a.m.
> Para: ccielab@groupstudy.com
> Asunto: Police QoS
>
> Dear group!
>
>
>
> I'm configuring QoS and confusing about "police" command in MQC
> policy-map,
> the command like this:
>
>
>
> Policy Map POLICY_85
>
> class class-default
>
> police 1000000 16000 exceed-action drop
>
>
>
> I don't understand deeply the number 16000 what does it mean?
>
> Could I use another number? For example: police 1000000 24000
> exceed-action
> drop
>
>
>
> Please explain me!
>
> Thanks!
>
>
>
> HaDucBinh
>
> Mail: haducbinh@vnpro.org or haducbinh@yahoo.com
>
> Phone: 0908 191 322
>
>
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