NBAR using MQC (sample from cisco)

must enable cef
ip cef

define class
class-map

define policy
policy-map

Apply the service policy
service-policy

Router# configure terminal
Router(config)# class-map cmap1
Router(config-cmap)# match protocol citrix

Router# configure terminal
Router(config)# policy-map policy1
Router(config-pmap)# class class1
Router(config-pmap-c)# bandwidth percent 50

Router# configure terminal
Router(config)# interface ethernet 2/4
Router(config-if)# service-policy input policy1