Limit interface transfer

class-map match-all CP-PDCA
  match access-group 30
!
policy-map CP-PDCA-Rate
  class CP-PDCA
    police 5000000 8000 exceed-action drop
    trust dscp
!

access-list 30 permit any

！

interface FastEthernet0/20
 service-policy input CP-PDCA-Rate
 duplex full
!