[ns] 2 TBF in cascade

[manel.fredj]

Hi everybody!!!!
I have a problem....
I don't know how to implemente 2 TBF in cascade between a node and an agent:
in the example test-tbf.tcl there is only the instruction 
"attach agent-tbf $agent $tbf $node"
but if I want to put 2 TBF in cascade do I have to: 
-create 2 TBF : TBF1 and TBF2
-and put 2 instructions :
                         "attach agent-tbf $agent $tbf1 $node"
                          "attach agent-tbf $agent $tbf2 $node"
Or the is an instruction which do that? (for example attach tbf-tbf.....I don't know)
I tried "attach tbf-tbf $agent $tbf1 $tbf2" but it doesn'twork

Please Help Me;

Manel Fredj 

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