QoS Shape Vs Police

From: Tom Rogers (cccie71@yahoo.com)
Date: Sat May 22 2004 - 11:55:21 GMT-3


Hello Every one,
 
Can some explain me the difference beween shape and police.
I did the research and could not find an answer.
 
When I look at the DQoS book ISBN#1-58720-058-9
Page 364 Example 5-5
It says the FR provider wants to police the VCs at 96kbps and we re to adjust our FR interfaces accordingly.
 
I was under the impression police cir command should do it.
But the solution has shape average.
 
My confusion is, I thought shape average kicks in when there is a congestion and would plateau the graph and policing no matter what we limit or restrict traffic even if there is no congestion and would tail drop the graph.
 
Can some one tell me the when to use police and when use shape?
 
I think I am lacking some concept here

                
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