James: Created page with "Running NS2 is a four step process. Prepare a Tcl script for NS2 like the example ('''''ex.tcl''''') shown below. This example has 2 nodes with 1 link and uses UDP agent with the CBR traffic generator.

 set ns [new Simulator] set tr [open trace.out w] $ns trace-all $tr  proc finish {} {         global ns tr         $ns flush-trace         close $tr         exit 0 }  set n0 [$ns node] set n1 [$ns node]  $ns duplex-link $n0 $n1 1Mb 10ms DropTail  set udp0 [new Agent..."

2022-10-20T20:13:19Z

Created page with "Running NS2 is a four step process. Prepare a Tcl script for NS2 like the example ('''''ex.tcl''''') shown below. This example has 2 nodes with 1 link and uses UDP agent with the CBR traffic generator. <pre> set ns [new Simulator] set tr [open trace.out w] $ns trace-all $tr proc finish {} { global ns tr $ns flush-trace close $tr exit 0 } set n0 [$ns node] set n1 [$ns node] $ns duplex-link $n0 $n1 1Mb 10ms DropTail set udp0 [new Agent..."

New page

Running NS2 is a four step process.

Prepare a Tcl script for NS2 like the example ('''''ex.tcl''''') shown below. This
example has 2 nodes with 1 link and uses UDP agent with the CBR traffic
generator.

<pre>
set ns [new Simulator]
set tr [open trace.out w]
$ns trace-all $tr

proc finish {} {
global ns tr
$ns flush-trace
close $tr
exit 0
}

set n0 [$ns node]
set n1 [$ns node]

$ns duplex-link $n0 $n1 1Mb 10ms DropTail

set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0
set cbr0 [new Application/Traffic/CBR]
$cbr0 set packetSize_ 500
$cbr0 set interval_ 0.005
$cbr0 attach-agent $udp0
set null0 [new Agent/Null]
$ns attach-agent $n1 $null0
$ns connect $udp0 $null0

$ns at 0.5 "$cbr0 start"
$ns at 4.5 "$cbr0 stop"
$ns at 5.0 "finish"

$ns run
</pre>

Create a SLURM batch submit script like the one shown here:

<pre>
#!/bin/bash
#SBATCH --partition production
#SBATCH --job-name NS2-job
#SBATCH --nodes=1
#SBATCH --ntasks=1

# You must explictly change to your working
# directory in SLURM

cd $HOME/my_NS2_wrk

/share/apps/ns2/ns-allinone-2.31/ns-2.31/ns ./ex.tcl
</pre>

Submit the job with:

<pre>
qsub submit
</pre>

Graph the result. At the HPC Center, 'nam' files can be produced, but cannot be run
because they require a graphical environment for execution. Trace Graph is a free
network trace file analyzer developed for NS2 trace processing. Trace Graph can
support any trace format if converted to its own or NS2 trace format. Supported NS2
trace file formats include:

<pre>
wired,satellite,wireless,new trace,wired-wireless.
</pre>

For more information on Trace Graph look here [http://www.tracegraph.com].

Users graphing results in Trace Graph must use Linux with X window system and allow X11 forwarding.

NS2 - Revision history