ip access-list standard CerNet

 permit any

class-map match-all CerNet-300M

  match access-group name CerNet

policy-map CerNet-300M

  class CerNet-300M

   police 300000000 65535    conform-action drop     exceed-action drop 

interface Vlanxx

 description xxx-CerNet-JingTai

 ip address 192.168.10.62 255.255.255.252

 service-policy input CerNet-300M