The Network Simulator ns-2: Topology Generation

The Network Simulator ns-2: Topology Generation

Topology generation is required for network simulations. In NS-2 you may create a topology for simulation using one of the following methods:

• by using the Inet topology generator.
• by using the GT-ITM topology generator.
• by using the Tiers topology generator.
• by using the other topology generators.
• by hand

 

Inet Topology Generator

• Generating graphs from Inet topology generator
  

   

• Conversion of Inet output to ns-2 format
  Use inet2ns to convert the inet topology to ns.

#!/usr/bin/perl
# Program to convert a inet topology to ns format
# Usage: inet2ns < inet.topo > ns.topo 
# Usage in ns : source ns.topo  in your tcl script and then
# call the procedure to create the topology using 
# create-topology linkbw [scaling factor for delay]  
# Assumptions: Eucliedian distance between the nodes is in miles.
# Hence propogation delay = distance / speed of light (186 x 10^3 miles/sec) 


#Read first line for number of nodes and links
chomp($line = <STDIN>);
($nodes, $links) = split(' ',$line);

print "proc create-topology { linkBW {sf 1} } {/n";
print "/tglobal ns/n";
print "/n/t#Create $nodes nodes in the topology/n";
print "/tfor {set i 0} {/$i < $nodes} {incr i} {/n";
print "/t/tset n(/$i) [/$ns node]/n";
print "/t}/n/n/n";
print "/t#Create $links edges in the topology/n";


#Skip all the location information
for ($i=0; $i<$nodes;$i++){
        $line = <STDIN>;
        $ref->[$i] = 0;
}

for