Re: Regarding CAR in QOS

Hi joe,
So lets say in the question it is asked XXX traffic should be transmitted
with an IP Precedence of 4 if its equal to or below 10 mbps.

Now in this CIR = 10 mbps = 10000000 bps

Now as per the formula

Bc = CIR ( in Bps ) /8 * 1.5

Therefore

Bc = 10000000 /8 * 1.5

Bc = 1875000 bps

But the answer is 5000 . So how did 5000 come if I go by the formula.

Please advise??

thanks
raghav

On Mon, Jun 8, 2009 at 8:27 PM, Joe Astorino <jastorino_at_ipexpert.com> wrote:

> Hey Raghav,
>
> According to the documentation the recommended values for BC and BE should
> be:
>
> Bc: (CIR/8) * 1.5
> Be: 2*Be
>
> This can be found here on the DocCD in the QoS command reference under the
> rate limit command:
>
> http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_q1.html#wp1015
> 612
> Weather or not you need IPP of 4 is really not relevent to what values you
> use for Bc and Be, it is a separate part of the question all together.
>
>
> Regards,
>
> Joe Astorino
> CCIE #24347 (R&S)
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Raghav Bhargava
> Sent: Monday, June 08, 2009 11:18 PM
> To: Cisco certification
> Subject: Regarding CAR in QOS
>
> Hi Experts,
> If the question says XXX traffic should be transmitted with an IP
> Precedence
> of 4 . Now when we configure the CAR , how do we calculate the Normal and
> Excessive Burst in this question specifically when IP Precedence is given.
>
> The answer is 5000 each . I just want to know who did we calculated the
> Normal and Excessive Burst.
>
> Appreciate all the help.
>
> --
> Warm Regards
> Raghav
>
>
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-- 
Warm Regards
Raghav
Blogs and organic groups at http://www.ccie.net