I was using nam to simulate a simple scenario the topology is as follow:
(1)
(0) (3)
(2)
Node 0 sends traffic to Node 3 through node 2 and is supposed to have Node 1 as
a backup path. After 2 seconds, node 2 moves out of range and Node 0 is
supposed to instantly switch to an alternate path. However it takes 8 seconds
and an addition Route discovery in order for node 0 to find a path to node 3.
Is AOMDV working??? I am using NS 2.34. and borrowing the code that is listed
on one of the popular ns sites. The code is below:
# A 3-node example for ad-hoc simulation with AODV
# 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) 4 ;# number of mobilenodes
set val(rp) AOMDV ;# routing protocol
set val(x) 1000 ;# X dimension of topography
set val(y) 700 ;# Y dimension of topography
set val(stop) 150 ;# time of simulation end
set ns [new Simulator]
set tracefd [open simple.tr w]
set windowVsTime2 [open win.tr w]
set namtrace [open simwrls.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 $val(nn)
#
# Create nn mobilenodes [$val(nn)] and attach them to the channel.
#
# 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]
}
# Provide initial location of mobilenodes
$node_(0) set X_ 150
$node_(0) set Y_ 350
$node_(0) set Z_ 0.0
$node_(1) set X_ 300
$node_(1) set Y_ 500
$node_(1) set Z_ 0.0
$node_(2) set X_ 300
$node_(2) set Y_ 200
$node_(2) set Z_ 0.0
$node_(3) set X_ 450
$node_(3) set Y_ 350
$node_(3) set Z_ 0.0
# Generation of movements
#$ns at 10.0 "$node_(0) setdest 250.0 250.0 3.0"
$ns at 12.0 "$node_(2) setdest 500 50 100.0"
#$ns at 15.0 "$node_(9) setdest 700.0 400.0 5.0"
#$ns at 12.5 "$node_(17) setdest 30.0 300.0 50.0"
# 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_(3) $sink
$ns connect $tcp $sink
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ns at 10.0 "$ftp start"
# 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
}
$ns run
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