[ns] Helpp please, how to assign bandwidth per flow

[Rami .Z.]

Help 
 
how to assign bandwidth per flow?
 
|--|     ----1->             |--|                  |--|
|A |-- 2Mb -------------| B|-------------|C |
|--|    -----2>              |--|                  |--|
 
 
i have this kind of topology and i want to assign only 30% of the bandwidth to flow 1
i know i can confgure flow 2 in such a way that it will be more aggresive but is there a nicer way?
but is there a nicer way?
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