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[ns] Why var "bandwidth_" in class Mac can't change through the simulation

Hi,all:
      I want to create two BS with different bitrates. I've tried to set
"bandwidth_" either in c++ or in TCl. 
But it doesn't work. It seems that the variable is set at the very beginning
of a simulation and can't change 
even in different objects of mac/mac802.11 class.