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How to use AODV routing protocol in ns2?


The reactive on demand routing protocols establish the route to a particular destination only if it is needed. Adhoc on-demand Distance Vector (AODV) is one of the commonly used reactive on demand routing protocols in mobile ad hoc network (MANET). AODV is a reactive enhancement of the DSDV protocol. The route discovery process involves ROUTE REQUEST (RREQ) and ROUTE REPLY (RREP) packets. The source node initiates the route requested through the route discovery process using RREQ packets. The generated route request is forwarded to the neighbors of the source node and this process is repeated till it reaches the destination. On receiving a RREQ packet, an intermediate node with route to destination, it generates a RREP containing the number of hops required to reach the destination. All intermediate nodes that participates in relaying this reply to the source node creates a forward route to destination. AODV minimizes the number of packets involved in route discovery by establishing routes on-demand. The sample15.tcl shows a node configuration for a wireless mobile node that runs AODV as its adhoc routing protocol. Prior to the establishment of communication between the source and receiver node, the routing protocol should be mentioned to find the route between them. Data Transmission is established between nodes using UDP agent and CBR traffic.

Sample Code

#Filename: sample15.tcl

#**************AODV ROUTING PROTOCOL***************************#
# Simulator Instance Creation
set ns [new Simulator]

#Fixing the co-ordinate of simutaion area
set val(x) 500
set val(y) 500
# Define options
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) 10 ;# number of mobilenodes
set val(rp) AODV ;# routing protocol
set val(x) 500 ;# X dimension of topography
set val(y) 500 ;# Y dimension of topography
set val(stop) 10.0 ;# time of simulation end

# set up topography object
set topo [new Topography]
$topo load_flatgrid $val(x) $val(y)
# general operational descriptor- storing the hop details in the network
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

# Node Creation

for {set i 0} {$i < 10} {incr i} {

set node_($i) [$ns node]
$node_($i) color black


for {set i 0} {$i < 10} {incr i} {

$node_($i) set X_ [expr rand()*$val(x)]
$node_($i) set Y_ [expr rand()*$val(y)]
$node_($i) set Z_ 0

#******************************Defining Communication Between node0 and all nodes ****************************8

for {set i 1} {$i < 10} {incr i} {
# Defining a transport agent for sending
set udp [new Agent/UDP]

# Attaching transport agent to sender node
$ns attach-agent $node_($i) $udp

# Defining a transport agent for receiving
set null [new Agent/Null]

# Attaching transport agent to receiver node
$ns attach-agent $node_(0) $null

#Connecting sending and receiving transport agents
$ns connect $udp $null

#Defining Application instance
set cbr [new Application/Traffic/CBR]

# Attaching transport agent to application agent
$cbr attach-agent $udp

#Packet size in bytes and interval in seconds definition
$cbr set packetSize_ 512
$cbr set interval_ 0.1

# data packet generation starting time
$ns at 1.0 "$cbr start"

# data packet generation ending time
#$ns at 6.0 "$cbr stop"