Policy MAp Vs QUEUE

Hi Friends

 

I have been preparing QOS, and suddenly got a basic doubt.. Why do we use policy map and why do we use mls qos srr commands,

I found a configuration with a policy map setting a class map a bandwidth of 30000 , and using mls qos srr command reduced the buffer size and queue size to create congestion in checka feature..

 

 

Can anybody please explain?

 

 

 

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