From: lalit gupta (lalit.tech@gmail.com)
Date: Sat Sep 29 2007 - 00:43:20 ART
HI,
Sorry got disconnected.. yesterday.
The calculation i did for normal burst (512000*1.5)/8 = 96000..
Extended burst is 2 * normal burst = 2*96000 = 192000
same formula applies to DOC cd example also (Same link)
Rate Limiting in an IXP Example
The following example uses rate limiting to control traffic in an Internet
Exchange Point (IXP). Because an IXP comprises many neighbors around an FDDI
ring, MAC address rate-limited access lists are used to control traffic from
a particular ISP. Traffic from one ISP (at MAC address 00e0.34b0.7777) is
compared to a rate limit of 80 Mbps of the 100 Mbps available on the FDDI
connection. Traffic that conforms to this rate is sent. Nonconforming
traffic is dropped.
interface Fddi2/1/0
rate-limit input access-group rate-limit 100 80000000 15000000 30000000
conform-action
transmit exceed-action drop
ip address 200.200.6.1 255.255.255.0
!
access-list rate-limit 100 00e0.34b0.7777
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hqos_r/qos_q1h.htm#wp1080850
rgrds
lalit
On 9/29/07, Mohmmad, Imran <Imran.Mohmmad@amd.com> wrote:
>
> Can anyone plz explain me what this formula exactly means, I am bit
> confused now.
>
> Imran
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Singhal
> Sent: Friday, September 28, 2007 4:04 PM
> To: ccie1101
> Cc: lalit gupta; Cisco certification
> Subject: Re: Value for burst-normal and burst-max for CAR if not
> provided ...
>
> Here is another good link on this.
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hq
> os_r/qos_q1h.htm#wp1080850
>
>
> On 9/28/07, ccie1101 <ccie1101@gmail.com> wrote:
> >
> > Hi Lalit,
> > Thanks but where do you get these formula from .... I am asking
> coz
> > when I refer to the doc cd, it does not say how they used the value
> > for the
> > burst-normal and burst-max ?
> >
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
> fqos_c/fqcprt1/qcfcar.htm
> >
> > Also I noticed that the value for the burst-normal and
> burst-max
> > are
> > small. If we use the formule you gave the burst-normal would be
> > 48000 and the burst-max is 96000 which seems pretty high.
> >
> > Can someone explain please ....
> >
> > Thank you,
> >
> > ccie1101.
> >
> > On 9/29/07, lalit gupta <lalit.tech@gmail.com> wrote:
> > >
> > > Hi ,
> > >
> > > My understanding is , we can not assume it 8000, if we do so ,
> > configured
> > > value will be different and you will not get the desired results.
> > >
> > > To acheive the configured rate, we should calculate it...the
> following
> > > values for the normal and extended burst parameters:
> > >
> > > normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds
> > >
> > > extended burst = 2 * normal burst
> > >
> > > rgrds
> > > lalit
> > >
> > >
> > > On 9/28/07, ccie1101 <ccie1101@gmail.com> wrote:
> > >
> > > > Hi,
> > > > Just need some advice on configuring CAR. If the question
> just
> > > > provides the transmission rate,
> > > > say 512K and no information on the burst-normal and burst-max,
> then do
> > > > we
> > > > just assume it is
> > > > ie) 8000 8000 ..... ?
> > > >
> > > > Pls advice,
> > > >
> > > > Thank you,
> > > >
> > > > ccie1101.
> > > >
> > > >
> >
> _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> _______________________________________________________________________
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>
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