Program 17:: Program to Simulator Grid-Topology

/* -*- Mode:C++; c-file-style:”gnu”; indent-tabs-mode:nil; -*- */

/*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License version 2 as

* published by the Free Software Foundation;

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*

* Author: Josh Pelkey <jpelkey@gatech.edu>

*/

#include <iostream> #include “ns3/core-module.h”

#include “ns3/network-module.h” #include “ns3/internet-module.h” #include “ns3/point-to-point-module.h” #include “ns3/netanim-module.h” #include “ns3/applications-module.h”

#include “ns3/point-to-point-layout-module.h” using namespace ns3;

int main (int argc, char *argv[])

{

Config::SetDefault (“ns3::OnOffApplication::PacketSize”, UintegerValue (512));

Config::SetDefault (“ns3::OnOffApplication::DataRate”, StringValue (“500kb/s”));

uint32_t xSize = 5; 
uint32_t ySize = 5;

std::string animFile = “grid-animation.xml”;

CommandLine cmd;

cmd.AddValue (“xSize”, “Number of rows of nodes”, xSize); 
cmd.AddValue (“ySize”, “Number of columns of nodes”, ySize);

cmd.AddValue (“animFile”, “File Name for Animation Output”, animFile);

cmd.Parse (argc,argv);

if (xSize < 1 || ySize < 1 || (xSize < 2 && ySize < 2))

{

NS_FATAL_ERROR (“Need more nodes for grid.”);

}

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”)); 
pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

// Create Grid

PointToPointGridHelper grid (xSize, ySize, pointToPoint);

// Install stack on Grid 
InternetStackHelper stack; 
grid.InstallStack (stack);

// Assign Addresses to Grid

grid.AssignIpv4Addresses (Ipv4AddressHelper (“10.1.1.0”, “255.255.255.0”),

Ipv4AddressHelper (“10.2.1.0”, “255.255.255.0”));

OnOffHelper clientHelper (“ns3::UdpSocketFactory”, Address ()); 
clientHelper.SetAttribute (“OnTime”, StringValue

(“ns3::ConstantRandomVariable[Constant=1]”)); clientHelper.SetAttribute (“OffTime”, StringValue

(“ns3::ConstantRandomVariable[Constant=0]”)); ApplicationContainer clientApps;

// Create an on/off app sending packets

AddressValue remoteAddress (InetSocketAddress (grid.GetIpv4Address (xSize- 1,ySize-1), 1000));

clientHelper.SetAttribute (“Remote”, remoteAddress); 
clientApps.Add (clientHelper.Install (grid.GetNode (0,0)));

clientApps.Start (Seconds (0.0));

clientApps.Stop (Seconds (1.5));

// Set the bounding box for animation 
grid.BoundingBox (1, 1, 100, 100);

// Create the animation object and configure for specified output 
AnimationInterface anim (animFile);

// Set up the actual simulation 
Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

Simulator::Run (); 
Simulator::Destroy (); 
return 0;

}

Output:

To draw the Graph consider the following files

grid.txt

grid.plt