Practical 8:: Program to simulate Hybrid Topology (Point-to-Point + Bus Topology)

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

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* published by the Free Software Foundation;

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#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/csma-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

#include “ns3/ipv4-global-routing-helper.h”

// Default Network Topology

//

// 10.1.1.0

// n0 -------------- n1 n2 n3 n4

// point-to-point | | | |

// ================

//   LAN 10.1.2.0

//netAnimation

#include “ns3/netanim-module.h”

#include “ns3/mobility-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“SecondScriptExample”);

int

main (int argc, char *argv[])

{

bool verbose = true;uint32_t nCsma = 3;

CommandLine cmd ( FILE );

cmd.AddValue (“nCsma”, “Number of \”extra\” CSMA nodes/devices”, nCsma);cmd.AddValue (“verbose”, “Tell echo applications to log if true”, verbose);

cmd.Parse (argc,argv);if (verbose)

{

LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);

}

nCsma = nCsma == 0? 1: nCsma;

NodeContainer p2pNodes;

p2pNodes.Create (2);

NodeContainer csmaNodes;

csmaNodes.Add (p2pNodes.Get (1));

csmaNodes.Create (nCsma);

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer p2pDevices;

p2pDevices = pointToPoint.Install (p2pNodes);

CsmaHelper csma;

csma.SetChannelAttribute (“DataRate”, StringValue (“100Mbps”));

csma.SetChannelAttribute (“Delay”, TimeValue (NanoSeconds (6560)));

NetDeviceContainer csmaDevices;

csmaDevices = csma.Install (csmaNodes);

InternetStackHelper stack;

stack.Install (p2pNodes.Get (0));

stack.Install (csmaNodes);

Ipv4AddressHelper address;

address.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer p2pInterfaces;

p2pInterfaces = address.Assign (p2pDevices);

address.SetBase (“10.1.2.0”, “255.255.255.0”);

Ipv4InterfaceContainer csmaInterfaces;

csmaInterfaces = address.Assign (csmaDevices);

UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApps = echoClient.Install (p2pNodes.Get (0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

pointToPoint.EnablePcapAll (“second”);

csma.EnablePcap (“second”, csmaDevices.Get (1), true);

//For Net Anim MobilityHelper mobility;

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(p2pNodes);

mobility.Install(csmaNodes);

AnimationInterface anim(“second.xml”);

AnimationInterface::SetConstantPosition (p2pNodes.Get(0), 10, 25);

AnimationInterface::SetConstantPosition(p2pNodes.Get(1), 20,25);

AnimationInterface::SetConstantPosition(csmaNodes.Get(1),40,25);

AnimationInterface::SetConstantPosition(csmaNodes.Get(2),50,25);

AnimationInterface::SetConstantPosition(csmaNodes.Get(3),60,25);

anim.EnablePacketMetadata(true);

Simulator::Run ();Simulator::Destroy ();

return 0;

}

Output:

To draw a Graph

lan.txt

2 123 345 2.0067 3.009

3 123 45 1.09 2.45

4

5

lan.plt

set terminal pdf

set output “Anas.pdf”

set title “PtoP and Bus topology” set xlabel “Nodes”

set ylabel “time delay”

plot “aaa.txt” using 1: 5 with linespoint title “LAN” lw 4

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