！流量限制
access-list 100 permit icmp any any echo
access-list 100 permit icmp any any echo-relay
！接口起用rate-limit
int s1/0/0
rate-limit input access-group 100 256000 8000 8000 conform-action transmit exceed-actiondrop
限制ICMP探测和应答流量为256k/bits,最大突发流量8000字节，超过限制的一律丢弃。
rate-limit input access-group 100 256000 8000 8000 conform-action transmit exceed-action drop