Hello.
Please consider the following script. I have written it for demonstrating
cross-layering:
# 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) 3 ;# number of mobilenodes
set val(rp) AODV ;# 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
set ns [new Simulator]
set tracefd [open cros_ex1_tr.tr w]
set namtrace [open cros_ex1_nam.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.
#
set chan_1_ [new $val(chan)]
# configure the nodes
$ns node-config -adhocRouting $val(rp) \
-llType $val(ll) \
-macType $val(mac) \
-channel $chan_1_ \
-ifqType $val(ifq) \
-ifqLen $val(ifqlen) \
-antType $val(ant) \
-propType $val(prop) \
-phyType $val(netif) \
-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_ 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"
set udp_ [new Agent/UDP]
$ns attach-agent $node_(0) $udp_
set null [new Agent/Null]
$ns attach-agent $node_(1) $null
set exp_ [new Application/Traffic/Exponential]
$exp_ set burst_time_ 0.01ms
$exp_ set idle_time_ 0.04ms
$exp_ set rate_ 1.5Mbps
$exp_ attach-agent $udp_
$exp_ attach-agent $udp_
$ns connect $udp_ $null
set ll_src_ [$node_(0) getLL 0]
$udp_ target $ll_src_
set ftp [new Application/FTP]
$ftp attach-agent $udp_
$ns at 10.0 "$ftp start"
# 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
}
$ns run
But this is the output:
num_nodes is set 3
INITIALIZE THE LIST xListHead
(_o14 cmd line 1)
invoked from within
"_o14 cmd getLL 0"
invoked from within
"catch "$self cmd $args" ret"
invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
(procedure "_o14" line 2)
(SplitObject unknown line 2)
invoked from within
"$node_(0) getLL 0"
invoked from within
"set ll_src_ [$node_(0) getLL 0]"
(file "cros_ex1.tcl" line 96)
I have read5th chapter of
"Introduction to Network Simulator NS2", that explains the Connector
class
[http://books.google.com/books?id=cD69He_oU60C&pg=PP1&dq=Introduction+to+Network+Simulator+NS2#v=onepage&q=&f=false
]
and also got help from Urlan
[http://mailman.isi.edu/pipermail/ns-users/2009-October/066621.html]
Please someone point out the mistake(s) or provide me with example script of
your own.
Thanks in advance.
