One part of the ns-allinone package is 'xgraph', a plotting program which can be used to create graphic representations of simulation results. In this section, I will show you a simple way how you can create output files in your Tcl scripts which can be used as data sets for xgraph. On the way there, I will also show you how to use traffic generators.
A note: The technique I present here is one of many possible ways to create output files suitable for xgraph. If you think there is a technique which is superior in terms of understandablity (which is what I aim for in this tutorial), please let me know.
First of all, we create the following topology:
The following piece of code should look familiar to you by now if you read the first sections of this tutorial.
set n0 [$ns node] set n1 [$ns node] set n2 [$ns node] set n3 [$ns node] set n4 [$ns node] $ns duplex-link $n0 $n3 1Mb 100ms DropTail $ns duplex-link $n1 $n3 1Mb 100ms DropTail $ns duplex-link $n2 $n3 1Mb 100ms DropTail $ns duplex-link $n3 $n4 1Mb 100ms DropTail