Hello evry Body, I am using the NS format generated by brite. when i try to use the node generated by the procedure create_topology (for monotoring per example), i have this error : // can't read "n(3)": no such variable while executing "$ns monitor-queue create_topology.$n(3) $n(6) """ invoked from within "set qmon36 [$ns monitor-queue create_topology.$n(3) $n(6) ""]" (file "topology.tcl" line 189)// the code is : // proc create_topology {} { global ns #nodes: set num_node 10 for {set i 0} {$i < $num_node} {incr i} { set n($i) [$ns mpls-node] } set node0 [$ns node] set node1 [$ns node] #links: set qtype CBQ $ns duplex-link $node0 $n(3) 10.0Mb 3ms DropTail $ns duplex-link $n(0) $n(6) 10.0Mb 2.312773335190996ms $qtype $ns duplex-link $n(1) $n(0) 10.0Mb 2.9694568204843463ms $qtype $ns duplex-link $n(2) $n(1) 10.0Mb 1.8352240604833803ms $qtype $ns duplex-link $n(3) $n(2) 10.0Mb 1.5822334297190923ms $qtype $ns duplex-link $n(4) $n(0) 10.0Mb 1.4360234541568795ms $qtype $ns duplex-link $n(5) $n(3) 10.0Mb 2.559521441995941ms $qtype $ns duplex-link $n(6) $n(3) 10.0Mb 0.7953178172063804ms $qtype $ns duplex-link $n(7) $n(4) 10.0Mb 2.7512102890042183ms $qtype $ns duplex-link $n(8) $n(7) 10.0Mb 1.6254465755920127ms $qtype $ns duplex-link $n(9) $n(3) 10.0Mb 0.5596028576377098ms $qtype $ns duplex-link $n(7) $node1 10.0Mb 3ms DropTail } #end function create_topology set qs 100 ## Queue Monitor for some links set qmon36 [$ns monitor-queue $n(3) $n(6) ""] set qmon63 [$ns monitor-queue $n(6) $n(3) ""] set sample36 [new Samples] $qmon04 set-delay-samples $sample36 set sample63 [new Samples] $qmon40 set-delay-samples $sample63 $ns queue-limit $n(3) $n(6) $qs // Best regards, _________________________________________________________________ Ten : Messenger en illimité sur votre mobile ! http://mobile.live.fr/messenger/ten/