AODV (Ad hoc On Demand Distance Vector) adalah distance vector routing protocol yang termasuk dalam klasifikasi reaktif routing protocol, yang hanya me-request sebuah rute saat dibutuhkan. AODV yang standar ini dikembangkankan oleh C. E. Perkins, E.M. Belding-Royer dan S. Das .
Ciri utama dari AODV adalah menjaga timer-based state pada setiap node sesuai dengan penggunaan tabel routing. Tabel routing akan kadaluarsa jika jarang digunakan.
AODV memiliki route discovery dan route maintenance. Route Discovery berupa Route Request (RREQ) dan Route Reply (RREP). Sedangkan Route Maintenance berupa Data, Route update dan Route Error (RRER).
Berikut contoh script sederhananya :
# Define options
# ======================================================================
set val(chan) Channel/WirelessChannel ;# channel type
set val(prop) Propagation/TwoRayGround ;# radio-propagation model
set val(ant) Antenna/OmniAntenna ;# Antenna type
set val(ll) LL ;# Link layer type
set val(ifq) Queue/DropTail/PriQueue ;# Interface queue type
set val(ifqlen) 50 ;# max packet in ifq
set val(netif) Phy/WirelessPhy ;# network interface type
set val(mac) Mac/802_11 ;# MAC type
set val(nn) 5 ;# number of mobilenodes
set val(rp) AODV ;# routing protocol
set val(x) 800
set val(y) 800
set ns [new Simulator]
#ns-random 0
set f [open aodv.tr w]
$ns trace-all $f
set namtrace [open aodv.nam w]
$ns namtrace-all-wireless $namtrace $val(x) $val(y)
set f0 [open packets_received.tr w]
set f1 [open packets_lost.tr w]
set f2 [open proj_out2.tr w]
set f3 [open proj_out3.tr w]
set topo [new Topography]
$topo load_flatgrid 800 800
create-god $val(nn)
set chan_1 [new $val(chan)]
set chan_2 [new $val(chan)]
set chan_3 [new $val(chan)]
set chan_4 [new $val(chan)]
set chan_5 [new $val(chan)]
# CONFIGURE AND CREATE 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 OFF \
-routerTrace ON \
-macTrace ON \
-movementTrace OFF \
-channel $chan_1 # \
#-channel $chan_2 \
#-channel $chan_3 \
#-channel $chan_4 \
#-channel $chan_5 \
proc finish {} {
global ns f f0 f1 f2 f3 namtrace
$ns flush-trace
close $namtrace
close $f0
close $f1
close $f2
close $f3
exec nam -r 5m aodv.nam &
exit 0
}
proc record {} {
global sink0 sink1 sink2 sink3 sink4 sink5 f0 f1 f2 f3
#Get An Instance Of The Simulator
set ns [Simulator instance]
#Set The Time After Which The Procedure Should Be Called Again
set time 0.05
#How Many Bytes Have Been Received By The Traffic Sinks?
set bw0 [$sink4 set npkts_]
set bw1 [$sink4 set nlost_]
#set bw2 [$sink2 set npkts_]
#set bw3 [$sink3 set npkts_]
#Get The Current Time
set now [$ns now]
#Save Data To The Files
puts $f0 "$now [expr $bw0]"
puts $f1 "$now [expr $bw1]"
#puts $f2 "$now [expr $bw2]"
#puts $f3 "$now [expr $bw3]"
#Re-Schedule The Procedure
$ns at [expr $now+$time] "record"
}
# define color index
$ns color 0 green
$ns color 1 red
$ns color 2 chocolate
$ns color 3 red
$ns color 4 brown
$ns color 5 tan
$ns color 6 gold
$ns color 7 black
set n(0) [$ns node]
#$ns at 0.0 "$n(0) color red"
$n(0) color "red"
$n(0) shape "circle"
set n(1) [$ns node]
$n(1) color "blue"
$n(1) shape "circle"
set n(2) [$ns node]
$n(2) color "green"
$n(2) shape "circle"
set n(3) [$ns node]
$n(3) color "red"
$n(3) shape "circle"
set n(4) [$ns node]
$n(4) color "tan"
$n(4) shape "circle"
for {set i 0} {$i < $val(nn)} {incr i} {
$ns initial_node_pos $n($i) 30+i*400
}
$n(0) set X_ 0.0
$n(0) set Y_ 0.0
$n(0) set Z_ 0.0
$n(1) set X_ 0.0
$n(1) set Y_ 0.0
$n(1) set Z_ 0.0
$n(2) set X_ 0.0
$n(2) set Y_ 0.0
$n(2) set Z_ 0.0
$n(3) set X_ 0.0
$n(3) set Y_ 0.0
$n(3) set Z_ 0.0
$n(4) set X_ 0.0
$n(4) set Y_ 0.0
$n(4) set Z_ 0.0
$ns at 0.0 "$n(0) setdest 100.0 100.0 3000.0"
$ns at 0.0 "$n(1) setdest 200.0 200.0 3000.0"
$ns at 0.0 "$n(2) setdest 300.0 300.0 3000.0"
$ns at 0.0 "$n(3) setdest 400.0 400.0 3000.0"
$ns at 0.0 "$n(4) setdest 500.0 500.0 3000.0"
$ns at 2.0 "$n(4) setdest 300.0 500.0 1000.0"
$ns at 4.0 "$n(0) setdest 200.0 300.0 1000.0"
$ns at 4.0 "$n(1) setdest 50.0 50.0 1000.0"
$ns at 3.5 "$n(2) setdest 500.0 300.0 1000.0"
$ns at 2.5 "$n(3) setdest 700.0 400.0 1000.0"
# CONFIGURE AND SET UP A FLOW
set sink0 [new Agent/LossMonitor]
set sink1 [new Agent/LossMonitor]
set sink2 [new Agent/LossMonitor]
set sink3 [new Agent/LossMonitor]
set sink4 [new Agent/LossMonitor]
$ns attach-agent $n(0) $sink0
$ns attach-agent $n(1) $sink1
$ns attach-agent $n(2) $sink2
$ns attach-agent $n(3) $sink3
$ns attach-agent $n(4) $sink4
#$ns attach-agent $sink2 $sink3
set tcp0 [new Agent/TCP]
$ns attach-agent $n(0) $tcp0
set tcp1 [new Agent/TCP]
$ns attach-agent $n(1) $tcp1
set tcp2 [new Agent/TCP]
$ns attach-agent $n(2) $tcp2
set tcp3 [new Agent/TCP]
$ns attach-agent $n(3) $tcp3
set tcp4 [new Agent/TCP]
$ns attach-agent $n(4) $tcp4
proc attach-CBR-traffic { node sink size interval } {
#Get an instance of the simulator
set ns [Simulator instance]
#Create a CBR agent and attach it to the node
set cbr [new Agent/CBR]
$ns attach-agent $node $cbr
$cbr set packetSize_ $size
$cbr set interval_ $interval
#Attach CBR source to sink;
$ns connect $cbr $sink
return $cbr
}
set cbr0 [attach-CBR-traffic $n(0) $sink4 800 .015]
#set cbr1 [attach-CBR-traffic $n(1) $sink2 1000 .015]
#set cbr2 [attach-CBR-traffic $n(2) $sink3 1000 .015]
#set cbr3 [attach-CBR-traffic $n(3) $sink0 1000 .015]
#set cbr4 [attach-CBR-traffic $n(4) $sink3 1000 .015]
$ns at 0.0 "record"
#$ns at 0.5 "$cbr0 start"
#$ns at 0.5 "$cbr2 start"
#$ns at 2.0 "$cbr0 stop"
#$ns at 2.0 "$cbr2 stop"
$ns at 1.0 "$cbr0 start"
#$ns at 4.0 "$cbr3 stop"
$ns at 6.0 "finish"
puts "Start of simulation.."
$ns run
Semoga Bermanfaat.............
