دیدم مثاله واضحیه گداشتم اینجا :
An example that limits an IP to 512K, with a nice, fat burst
First create the access lists
access-list 100 permit ip any host 192.168.100.100
access-list 100 permit ip host 192.168.100.100 any
Then apply rate limiting rules to the appropriate interface
rate-limit input access-group 100 512000 1024000 2048000 conform-action transmit exceed-action drop
rate-limit output access-group 100 512000 1024000 2048000 conform-action transmit exceed-action drop
Extra Tip: If, in a rate-limit rule, you reference an access list that does not exist, the rule will match all traffic. Usually not good