Category Archives: Algorithms

DSDV Algorithm (implementation of 3 nodes)

Standard

# this is the TCL script

set val(chan)           Channel/WirelessChannel    ;# channel type
set val(prop)           Propagation/TwoRayGround   ;# radio-propagation model
set val(netif)          Phy/WirelessPhy            ;# network interface type
set val(mac)            Mac/802_11                 ;# MAC type
set val(ifq)            Queue/DropTail/PriQueue    ;# interface queue type
set val(ll)             LL                         ;# link layer type
set val(ant)            Antenna/OmniAntenna        ;# antenna model
set val(ifqlen)         50                         ;# max packet in ifq
set val(nn)             3                         ;# number of mobilenodes
set val(rp)             DSDV                       ;# routing protocol
set val(x)              500                  ;# X dimension of topography
set val(y)              400                  ;# Y dimension of topography
set val(stop)           150               ;# time of simulation end

#Creating trace file and nam file
set ns          [new Simulator]
set tracefd       [open dsdv1.tr w]
set windowVsTime2 [open DSDV.tr w]
set namtrace      [open dsdv.nam w]

$ns trace-all $tracefd
$ns namtrace-all-wireless $namtrace $val(x) $val(y)

# set up topography object
set topo       [new Topography]

$topo load_flatgrid $val(x) $val(y)

create-god $val(nn)

# configure the nodes
$ns node-config -adhocRouting $val(rp) \
-llType $val(ll) \
-macType $val(mac) \
-ifqType $val(ifq) \
-ifqLen $val(ifqlen) \
-antType $val(ant) \
-propType $val(prop) \
-phyType $val(netif) \
-channelType $val(chan) \
-topoInstance $topo \
-agentTrace ON \
-routerTrace ON \
-macTrace OFF \
-movementTrace ON

for {set i 0} {$i < $val(nn) } { incr i } {
set node_($i) [$ns node]

#set node_(0) [$ns node]
#set node_(1) [$ns node]
#set node_(2) [$ns node]

}
# Defining heades..
$ns at 0.0 “$node_(2) label CH”
$ns at 0.0 “$node_(1) label Source”
$ns at 0.0 “$node_(0) label Destination”

# Provide initial location of mobilenodes
$node_(0) set X_ 5.0
$node_(0) set Y_ 5.0
$node_(0) set Z_ 0.0

$node_(1) set X_ 490.0
$node_(1) set Y_ 285.0
$node_(1) set Z_ 0.0

$node_(2) set X_ 150.0
$node_(2) set Y_ 240.0
$node_(2) set Z_ 0.0

# Generation of movements
$ns at 10.0 “$node_(0) setdest 250.0 250.0 3.0”
$ns at 15.0 “$node_(1) setdest 45.0 285.0 5.0”
$ns at 110.0 “$node_(0) setdest 480.0 300.0 5.0”

$ns at 0.0 “$node_(2) add-mark N2 green circle”
$ns at 85.0 “$node_(0) add-mark N0 green circle”
$ns at 85.0 “$node_(1) add-mark N1 green circle”

# Set a TCP connection between node_(0) and node_(1)
set tcp [new Agent/TCP/Newreno]
$tcp set class_ 2
set sink [new Agent/TCPSink]
$ns attach-agent $node_(0) $tcp
$ns attach-agent $node_(1) $sink
$ns connect $tcp $sink
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ns at 10.0 “$ftp start”

$ns at 90.0 “$node_(2) add-mark N3 yellow circle”
$ns at 104.0 “$node_(1) add-mark N2 yellow red”
$ns at 125.0 “$node_(0) add-mark N4 red circle”
# Printing the window size

proc plotWindow {tcpSource file} {
global ns
set time 0.01
set now [$ns now]
set cwnd [$tcpSource set cwnd_]
puts $file “$now $cwnd”
$ns at [expr $now+$time] “plotWindow $tcpSource $file” }
$ns at 10.1 “plotWindow $tcp $windowVsTime2”

# Define node initial position in nam
for {set i 0} {$i < $val(nn)} { incr i } {

# 30 defines the node size for nam
$ns initial_node_pos $node_($i) 30
}

# Telling nodes when the simulation ends
for {set i 0} {$i < $val(nn) } { incr i } {
$ns at $val(stop) “$node_($i) reset”;
}

# ending nam and the simulation
$ns at $val(stop) “$ns nam-end-wireless $val(stop)”
$ns at $val(stop) “stop”
$ns at 150.01 “puts \”end simulation\” ; $ns halt”

proc stop {} {
global ns tracefd namtrace
$ns flush-trace
close $tracefd
close $namtrace
exec nam dsdv.nam &
#exec xgraph DSDV.tr -geometry 800×400 &
exit 0
}

$ns run

  • To run this script “$ns dsdv.tcl

Screenshot from 2012-12-02 222153

  • Sending the Packets one Node to another node..

imprt