From: Yasser Aly (blackyeyes00@hotmail.com)
Date: Tue Feb 17 2004 - 21:15:13 GMT-3
Hi Packet Man,
Bc and Be are configured in Bytes not bits. I am not sure about whether it
is per Tc or not.
Needs clarification.
Regards,
Yasser
>From: "Packet Man" <ccie2b@hotmail.com>
>To: blackyeyes00@hotmail.com, ccielab@groupstudy.com
>Subject: RE: Limiting ICMP using CAR
>Date: Tue, 17 Feb 2004 18:27:11 -0500
>
>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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