QoS Policing with and withour CIR keyword

Brothers,

please help me understand the difference between QoS Policing with and withour CIR keyword. Below are examples:

 

With CIR keyword:

policy-map policy1

class one_rate_2_color_policer

police cir 256000 conform transmit violate drop



source:

wo CIR keyword:


policy-map parent 
class class-default
police 3300000 103000 103000 conform-action transmit exceed-action drop

source:
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800a3a25.shtml

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