exp2.tcl

set ns [new Simulator]

$ns color 1 green
$ns color 2 yellow
#Open the NAM trace file
set nf [open out.nam w]
$ns namtrace-all $nf
#Define a 'finish' procedure
proc finish {} {
    global ns nf
    $ns flush-trace
    close $nf
    exec nam out.nam &

    exit 0
}
#Create two nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]
set n5 [$ns node]
#Create links between the nodes
$ns duplex-link $n0 $n2 10Mb 2ms DropTail
$ns duplex-link $n1 $n2 10Mb 3ms DropTail
$ns duplex-link $n2 $n3 1.5Mb 20ms DropTail
$ns duplex-link $n3 $n4 10Mb 4ms DropTail
$ns duplex-link $n3 $n5 10Mb 5ms DropTail
#Give node position (for NAM)
$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient right
$ns duplex-link-op $n3 $n4 orient right-up
$ns duplex-link-op $n3 $n5 orient right-down
#Setup a TCP connection
set tcp1 [new Agent/TCP]
$tcp1 set class_ 2
$ns attach-agent $n0 $tcp1
set sink1 [new Agent/TCPSink]

$ns attach-agent $n4 $sink1
$ns connect $tcp1 $sink1
$tcp1 set fid_ 1
#Setup a FTP over TCP connection
set ftp1 [new Application/FTP]
$ftp1 attach-agent $tcp1
$ftp1 set type_ FTP
#Setup a TCP connection
set tcp [new Agent/TCP]
$tcp set class_ 2
$ns attach-agent $n1 $tcp
set sink [new Agent/TCPSink]
$ns attach-agent $n4 $sink
$ns connect $tcp $sink
$tcp set fid_ 2
#Setup a FTP over TCP connection
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ftp set type_ FTP
#Schedule events for the CBR
$ns at 0.5 "$ftp1 start"
$ns at 4.5 "$ftp1 stop"
$ns at 1.0 "$ftp start"
$ns at 3.5 "$ftp stop"
$ns at 4.0 "finish"


#Call the finish procedure after 5 seconds of
#simulation time $ns at 5.0 "finish"

$ns run