From: Imal kalutotage (imal.kalutotage@gmail.com)
Date: Wed Nov 16 2005 - 03:40:15 GMT-3
Hi Kumar,
What I remember is multiply by 1.5 sec is not needed..
May be Chris can explain this very well..
Imal
On 11/16/05, Kumar Raja-Q16843 <Raja.Kumar@motorola.com> wrote:
>
> Thanks Daniel for your inputs, let me rephrase the question, just want
> to be doubly sure, this was a wicked question thrown at us during the
> practice, but then it make sense......this question makes me remember
> the response of Tim in the mail train "Top Reasons People Fail the Lab",
> Coming to the point...
>
> CIR = 10 Mbps; Normal Burst = 500 kbps; Maximum Burst = 1 Mbps
>
> rate-limit input <Cir_ Bits/sec> <Normal Burst Bytes> <Maximum Burst
> Bytes> transmit exceed-action drop
>
> The attribute CIR is straight forwards since it is in bits/sec, the
> given value is the same measure
> My test is here with the Normal Burst, the attribute in the command has
> a measure of bytes, let me try (pardon me if I am being stupid)
> (500*1000/8)*1.5 = 93750 bytes
> Same the case with Maximum burst, the value would be (1000000/8)*1.5 =
> 187,500 bytes
> Then the command would be
> rate-limit input 10000000 93750 187500 transmit exceed-action drop
>
> Has my way calculating the values are correct or am I missing something
> here?
> I guess, , Does it still sound stupid?
>
> Thanks in advance,
> Raja
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Daniel Berlinski
> Sent: Wednesday, November 16, 2005 9:49 AM
> To: Kumar Raja-Q16843; ccielab@groupstudy.com
> Subject: RE: Question on Qos rate-limiting
>
> Kumar
>
> IMHO your numbers make a Tc of 50ms (bc/cir *1000) hence you area
> leaking bytes into the line across 20 intervals in one sec to send 10Meg
> If you allow a burst of 125000 bytes, it means that after 20 intervals
> of 50ms each you will end up sending 125000 bytes(1Mbps) * 20= 20Mbps
>
> To allow a max burst of 1Mbps I think (I could be wrong please someone
> correct me in this one) you should use a be of 6250 bytes
>
> Cheers
>
>
> ________________________________
>
> From: nobody@groupstudy.com on behalf of Kumar Raja-Q16843
> Sent: Wed 16/11/2005 7:11 a.m.
> To: ccielab@groupstudy.com
> Subject: Question on Qos rate-limiting
>
>
>
> Hi Guys,
>
> In rate-limiting , I have this question, a CIR of 10 Mbps with a normal
> burst of 500 kbps and a maximum burst of 1 Mbps, the traffic should pass
> if the set condition matches if not the packet be dropped.
>
> Interface Ethernet0/0
>
> ip address 10.10.10.1 <http://10.10.10.1>
255.255.255.0<http://255.255.255.0>
>
> rate-limit input 10000000 62500 125000 conform-action transmit
> exceed-action drop
>
> Kindly advice if my configuration is correct, the above solution is
> because I was given the normal burst value of 500 kbps, but actually we
> don't need this value, if we are given with the CIR and the normal burst
> can be calculated as (CIR*1.5/8), when the value of normal burst is
> explicitly given, should we use or we still go ahead and calculate the
> normal using the formula.
>
> Thanks in advance,
>
> Raja
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
> This communication, including any attachments, is confidential. If you
> are not the intended recipient, you should not read it - please contact
> me immediately, destroy it, and do not copy or use any part of this
> communication or disclose anything about it. Thank you. Please note that
> this communication does not designate an information system for the
> purposes of the Electronic Transactions Act 2002.
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Thu Dec 01 2005 - 09:12:07 GMT-3