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[ns] McastMonitor

 Hi Ns-users

I want to use  "McastMonitor" to collect packet count and packet loss rate
information eventually but  it didn't work. 

My script on this part is
 
set mcastmonitor [$ns McastMonitor] 
$mcastmonitor set period_ 0.05 
$mcastmonitor trace-topo $srv_node $groupAddr 

But I got a error message like this :

-03: unable to dispatch method McastMonitor
      while executing
"$ns McastMonitor"
       (file "mcast1.tcl" line 15)

Is "McastMonitor" no longer available ?


thanks

jin h chung