From: Ben (ccieben@cox.net)
Date: Mon Mar 05 2007 - 17:25:15 ART
Hi Dishan:
Check this out:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/123tqr/qos_q1gt.htm#wp1080850
CAR embodies a rate-limiting feature for policing traffic. When policing
traffic with CAR, Cisco recommends 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
HTH,
Ben
Dishan Gamage wrote:
> Hi Group
>
>
> The question asks to limit ICMP rate to 500kbps on serial s0/0 (Dos Attack
> prevention)
>
> Int S0/0
> rate-limit input access-group 101 496000 10000 10000 conform-action transmit
> exceed-action drop
>
> access-list 101 permit icmp any any echo log
> access-list 101 permit icmp any any echo-reply log
>
>
> but i am not sure how to calculate the burst sizes ? what % should i use for
> normal & maximum burst...??
> can someone point out a good link please ??
>
> Tks in Advance
>
> Dishan
>
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