From: Packet Man (ccie2b@hotmail.com)
Date: Tue Feb 17 2004 - 20:27:11 GMT-3
Yasser,
I think the issue you might be having is due to the different units used for
the different parameters. Remember that the 1st parameter, cir, is in bits
per SECONDS while the Bc and Be are in bits per Tc which is 1/8 of a
second.
So, 128,000 kbps dvided by 8 = 16,000 = bits per interval, Tc. To allow for
a burst of 1/4 of this rate, divide by 4. 16,000 / 4 = 4000.
Now, given the requirements you stated, I think the answer that was provided
is wrong. I think it should be
CIR Bc Be
rate-limit output access-group 100 128000 16000 4000 conform-action
transmit exceed-action drop
Hopefully, if I'm mistaken, someone will immediately say so and point out my
mistake. (It wouldn't be the 1st time)
HTH
>From: "Yasser Aly" <blackyeyes00@hotmail.com>
>Reply-To: "Yasser Aly" <blackyeyes00@hotmail.com>
>To: ccielab@groupstudy.com
>Subject: Limiting ICMP using CAR
>Date: Tue, 17 Feb 2004 18:07:34 -0500
>
>Hi group,
>
> The task is as follows: Configure E0/0 such that ICMP traffic is limited
>to 128Kbps.
>Allow for a burst of 1/4th of this rate.
>
>
>The answer for this question was as follows:
>
>acess-group 101 permit icmp any any
>!
>interface Ethernet0/0
>rate-limit output access-group 100 128000 4000 4000 conform-action transmit
>exceed-action drop
>
>I am confused why Bc and Be were set this way. Would you kindly explain and
>give more detail on general concepts used when configuring Bc and Be while
>using CAR.
>
>Regards,
>Yasser
>
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