Re: Regarding CAR in QOS

Well thanks Joe... I will do some more research on it. BTW I am using
Narbik's workbook...
raghav

On Mon, Jun 8, 2009 at 8:36 PM, Joe Astorino <jastorino_at_ipexpert.com> wrote:

> I am not sure what question out of what workbook you are looking at, but
> I would just guess that perhaps they did not use the "recommended" value
> stated in the DocCD. What vendor / lab are you doing? If it is one of our
> labs, I will look into it, if not I would suggest you contact the author of
> the lab in question. I have seen it go both ways...usually if it is not
> stated, I would use the forumula I gave you...unless for some reason they
> give you a specific number to use there.
>
>
> Regards,
>
> Joe Astorino
> CCIE #24347 (R&S)
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>
>
>
> ------------------------------
> *From:* Raghav Bhargava [mailto:raghavbhargava12_at_gmail.com]
> *Sent:* Monday, June 08, 2009 11:34 PM
> *To:* Joe Astorino
> *Cc:* Cisco certification
> *Subject:* 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
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 8.5.339 / Virus Database: 270.12.54/2158 - Release Date: 06/08/09
>> 06:01:00
>>
>>
>
>
> --
> Warm Regards
> Raghav
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.339 / Virus Database: 270.12.54/2158 - Release Date: 06/08/09
> 06:01:00
>

--
Warm Regards
Raghav
Blogs and organic groups at http://www.ccie.net