[ns] Does "PruneTimeout" run well?

[Zhai Mingyu <myzhai@seu.edu.cn>]

Sir.,
   The following script is written by modifying  ns/tcl/ex/mcast.tcl and

inserting a clause "set PruneTimeout 100" before "set mproto DM". But
when I run it, I find it does not function well. It seems that still the
default "PruneTimeout = 0.5" is functioning.
.How can I correct it next step? Would you please point out some other
errors about the script for me?

thx

Zhai
============= the Script==================
#
# Copyright (c) 1996 Regents of the University of California.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the

#    documentation and/or other materials provided with the
distribution.
# 3. All advertising materials mentioning features or use of this
software
#    must display the following acknowledgement:
#  This product includes software developed by the MASH Research
#  Group at the University of California Berkeley.
# 4. Neither the name of the University nor of the Research Group may be

#    used to endorse or promote products derived from this software
without
#    specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

# SUCH DAMAGE.
#
# @(#) $Header: /usr/src/mash/repository/vint/ns-2/tcl/ex/mcast.tcl,v
1.12 1999/09/10 22:08:41 haoboy Exp $
# updated to use -multicast on and allocaddr by Lloyd Wood

#
# Simple multicast test.  It's easiest to verify the
# output with the animator.
# We create a four node start; start a CBR traffic generator in the
center
# and then at node 3 and exercise the join/leave code.
#
# See tcl/ex/newmcast/mcast*.tcl for more mcast example scripts

set ns [new Simulator -multicast on]

set f [open out.tr w]
$ns trace-all $f
$ns namtrace-all [open out.nam w]

$ns color 1 red
# prune/graft packets
$ns color 30 purple
$ns color 31 red

set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]

# Use automatic layout
$ns duplex-link $n0 $n1 1.5Mb 10ms DropTail
$ns duplex-link $n1 $n2 1.5Mb 10ms DropTail
$ns duplex-link $n1 $n3 1.5Mb 10ms DropTail

$ns duplex-link-op $n0 $n1 orient right
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n1 $n3 orient right-down
$ns duplex-link-op $n0 $n1 queuePos 0.5

set PruneTimeout 100
set mproto DM
set mrthandle [$ns mrtproto $mproto {}]
set group0 [Node allocaddr]

set udp0 [new Agent/UDP]
$ns attach-agent $n1 $udp0
$udp0 set dst_addr_ $group0
$udp0 set dst_port_ 0
$udp0 set fid_ 1
set cbr0 [new Application/Traffic/CBR]
$cbr0 attach-agent $udp0


set rcvr [new Agent/LossMonitor]
$ns attach-agent $n2 $rcvr
$ns at 1.2 "$n2 join-group $rcvr $group0"


$ns at 0.1 "$cbr0 start"


puts [$cbr0 set packetSize_]
puts [$cbr0 set interval_]

$ns at 2.0 "finish"

proc finish {} {
 global ns
 $ns flush-trace

 puts "running nam..."
 exec nam out.nam &
 exit 0
}

$ns run


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