QoS Hierárquico

I copied this from an email I sent to my coworkers, so I kept it in pt-br.

policy-map OUT // policy “filho”

class APP_CRITICO1

    bandwidth percent 25

  set ip dscp af32

class APP_CRITICO2

    bandwidth percent 25

  set ip dscp af33

class EXPRESS

    bandwidth percent 20

  set ip dscp af21

class class-default

    fair-queue

  set ip dscp default

policy-map SHAPE_OUT // policy “pai”

class class-default

    shape average 2048000

  service-policy OUT

Basicamente o que essa policy permite é que seja feito traffic-shaping, e que esse traffic-shaping seja dividido em 25% pra APP_CRITICO1, 25% pra APP_CRITICO2, 20% pra EXPRESS e o restante se sobrar espaço no shaping.

Como é o tipo de documento que fica escondido na documentação da Cisco, achei que iam gostar de ler. Se souberem de algum outro mandem!

http://www.cisco.com/en/US/docs/routers/10000/10008/configuration/guides/qos/10qhier.html

And the winner for simplest explanation on shaping goes to:

Probably the simplest, quickest and most yummy explanation on QoS shaping I've read. Gotta spread it around!

From: Les Waller
To: Bal, ccie_rs onlinestudylist.com
Let me respond within your email...

On Thu, Apr 12, 2012 at 10:53 AM, Bal wrote:
> Hello Experts,
>
> Need some guidance please on QoS with respect to shaping and Tc/Bc/Be
> values. I just need to confirm what i'm reading and the way im interpreting
> it.
>
> 1. CIR <= 320 Kbps:
>
> If I'm shaping below 320 Kbps my Bc/Be values will always be 8000 bits,
> with the Tc calculated using Tc=Bc/CIR

  Your Tc will be determined by your value of the Bc.

  The CIR is the total data to pass in one second. The Bc is the data that will pass in one slice of time for x number of times per second.

  Let's say you have a pizza that is 16 inches in circunference. If the Bc is 2 inches then it will take 8 pieces of pizza to make a whole. If the Bc is 8 inches, then it will only take 2 pieces to make a whole. 

  Put another way, it takes an hour to eat a pizza. You won't eat the whole thing at one gulp, so you break it into pieces (bursts). So the pieces are 2 inches in size then you can eat eight pieces each 7.5 minutes apart or you can eat two 8 inch pieces 30  minutes apart.

> 2. CIR >= 320 Kbps

> If I'm shaping above 320 Kbps, my Tc is always 25ms, my Bc = shaping rate *
> Tc and my Be = Bc
>
> Thanks
> Bal

Instant winner!

Credits to Les Waller from the CCIE RS OnlineStudy List.

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• Apply for a job without proper certifications;
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