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[Q] Scheduling ..??

hi, ns users.
I try to create a input queue in node and simulate it.
but, node is not act correctly. I guess, Input Queue, i made,
is not schedule in event scheduler.
A node, recivied packet, does not any kind of action.
and, in NAM, I write  a tcl code for 1 second simulation code,
NAM only work during 10ns.
After receiver node received one packet, NAM finished the simulation.

Below is show my work ( create input queue )
-----------------------------------------------------------------------------

Node
-----------------------------------------
|                                                            |
|     entry_ ------------> Classifier_        |
|                        ^                                   |
|                         |                                   |
|                       input_queue_                 |
|                                                            |
-----------------------------------------

[ ns-node.tcl ]  I  modified ....

Node instproc mk-default-classifier {} {
     $self instvar address_ classifier_ id_ input_queue_
     set classifier_ [new Classifier/Addr]
     # set up classifer as a router (default value 8 bit of addr and 8 bit port)
     $classifier_ set mask_ [AddrParams set NodeMask_(1)]
     $classifier_ set shift_ [AddrParams set NodeShift_(1)]
     set address_ $id_
     # 1999.09.09 hokunchung inserted ---------------------------------------
     puts "Node instproc mk-default-classifier routine.."
     set input_queue_ [new Queue/RED]
     $input_queue_ target $classifier_
    # ----------------------------------------------------------------------
}

How can I schedule input_queue_ ?

previously, thank you...