Re: Policing and dropping packets

Thanks Joe and Carlos. I definitely agree that this question is pretty
confusing. So if we are talking about rate, it's safe to say that it will
drop packets if the rate is above 100Kbps and when the BE bucket size
exceeds 64000 bits? Correct?

Thanks

On Wed, Jul 20, 2011 at 5:52 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> The question is way confusing, because it says "burst RATE exceeds xxx
> bits", and that is formally wrong because bits is not a rate unit.
>
> -Carlos
>
> Joe Astorino @ 20/07/2011 19:31 -0300 dixit:
>
> I believe B is correct. The burst parameters are in terms of bytes, not
>> bits. 8000 bytes = 64,000 bits. Also, the burst is not a rate in terms
>> of
>> something like bits or bytes per second. The burst values are NOT rates.
>> They are literally the size of the token bucket. So, if you configure a
>> BE
>> here of 8000 bytes you are not saying the burst is 8000 bytes or 64,000
>> bits
>> PER SECOND, you are just saying the size of the BE token bucket that is
>> used
>> to sustain bursts is 8000 bytes. The size of that token bucket mixed with
>> time and the policed rate determine how much burst you can actually
>> sustain
>>
>> HTH man
>>
>> On Wed, Jul 20, 2011 at 5:59 PM, Tom Kacprzynski <tom.kac_at_gmail.com>
>> wrote:
>>
>> Hello,
>>> I am reviewing few QoS questions I got to study. The question is:
>>>
>>> "Using CBWFQ Policing with command:
>>> police 100000 5000 8000 conform-action transmit exceed-action
>>> set-qos-transmit 4 violate-action drop.
>>> When will the router begin to drop packets?"
>>>
>>> a. when burst rate exceeds 100000 bits
>>> b. when burst rate exceeds 64000 bits
>>> "
>>>
>>> I thought A, but the answer sheet says B. So my questions which is right?
>>> Why would you set something to police at 100 kbps when you'll start
>>> getting
>>> packets dropped at 64 Kbps...doesn't make sense.
>>>
>>> Can someone else please verify and explain?
>>>
>>> Thank you,
>>>
>>> Tom
>>>
>>>
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>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Thu Jul 21 2011 - 09:17:30 ART