Shaping, policing and minimum bandwidth guatantee

Hello experts,
I am reading the following Cisco document "Comparing Traffic Policing and
Traffic Shaping for Bandwidth Limiting"
(
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800a3a25.shtml)

Can someone please explain their sentence: "neither mechanism provides a
minimum bandwidth guarantee during periods of congestion"

I am confused as I believed that there are commands that do just that, for
example:

In legacy configuration:
# map-class frame-relay XXX
# frame MINCIR 8000 <--------------------

In MQC:
# policy-map XXX
# class class-default
# shape ADAPTIVE 8000 <--------------------

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Received on Thu Oct 28 2010 - 12:16:32 ART