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handle for rtobject?



I am trying to use $node rtObject? to return the handle of an routing
node.
 My code is like this:
 
 ...
 $ns rtproto DV [list $d1 $r1 $r2 $n2 $n1 $n3]
 
 set handle [$r1 rtObject?]
 puts "$handle"
 ...
 
The value of handle is "", which is empty despite I have initialized all nodes
with rtproto before.
 
Does anyone has any clue why this is happen?
Any help would be much appreciated. 

Ian Liu