mls qos

policy-map 512kbps_policy
  class class-default
   police cir 512000 bc 2000 be 2000 conform-action transmit exceed-action drop violate-action drop

interface Port-channel3
 switchport
 switchport trunk encapsulation dot1q
 mls qos vlan-based

interface Vlan22
 service-policy input 512kbps_policy
 service-policy output 512kbps_policy