针对某些ip限制速度
1)设置ACL
access-list 102 permit ip host 192.168.10.2 any
access-list 102 permit ip any host 192.168.10.2
access-list 103 permit ip host 192.168.10.3 any
access-list 103 permit ip any host 192.168.10.3
2）定义类
class-map match-all 102
 match access-group 102
class-map match-all 103
 match access-group 103
3）将类加入策略中
policy-map xiansu
class 102
police 1024000 128000 conform-action transmit exceed-action drop
class 103
police 1024000 128000 conform-action transmit exceed-action drop

4）将策略加入端口中
interface FastEthernet0/0
service-policy input xiansutest
service-policy output xiansutest

针对某个网段进行限速（限定的是总带宽）

1）设置ACL
access-list 110 permit ip 192.168.10.0 0.0.0.255 any
access-list 102 permit ip any 192.168.10.0 0.0.0.255
2）定义类
class-map match-all 110
 match access-group 110
3）设置策略
policy-map xiansu110
class 110
police 10240000 1280000  conform-action transmit exceed-action drop
4）将策略加入端口
interface FastEthernet0/0
service-policy input xiansu110
service-policy output xiansu110