How to Implement Extended Bus Topology in ns3

To implement an extended bus topology in ns3, we need to create a network using the bus topology principle. In this network multiple nodes should be connected in a linear sequence and also extended to compromise larger number of nodes. Share your parameter details with us for top-notch networking performance analysis.

The following steps will guide on how to implement Extended Bus Topology in ns3.

Step-by-step to implement Extended Bus Topology

Step 1: Install ns3

Make sure ns3 is installed on the system.

Step 2: Create a New Simulation Script

Create a new C++ script for the simulation.

Step 3: Include Necessary Headers

In the script, include the necessary ns3 headers:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/csma-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

Step 4: Set Up the Extended Bus Topology

Below an example on setting up an extended bus topology with multiple nodes:

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“ExtendedBusTopology”);

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

{

// Configure command line parameters

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer busNodes;

busNodes.Create (8); // Create 8 nodes for the extended bus topology

// Set up CSMA links for the bus topology

CsmaHelper csma;

csma.SetChannelAttribute (“DataRate”, StringValue (“1Gbps”));

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

NetDeviceContainer busDevices = csma.Install (busNodes);

// Install the internet stack

InternetStackHelper stack;

stack.Install (busNodes);

// Assign IP addresses to the bus devices

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer busInterfaces = address.Assign (busDevices);

// Set up mobility model (optional)

MobilityHelper mobility;

Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

positionAlloc->Add (Vector (10.0, 50.0, 0.0)); // Bus node 1 position

positionAlloc->Add (Vector (20.0, 50.0, 0.0)); // Bus node 2 position

positionAlloc->Add (Vector (30.0, 50.0, 0.0)); // Bus node 3 position

positionAlloc->Add (Vector (40.0, 50.0, 0.0)); // Bus node 4 position

positionAlloc->Add (Vector (50.0, 50.0, 0.0)); // Bus node 5 position

positionAlloc->Add (Vector (60.0, 50.0, 0.0)); // Bus node 6 position

positionAlloc->Add (Vector (70.0, 50.0, 0.0)); // Bus node 7 position

positionAlloc->Add (Vector (80.0, 50.0, 0.0)); // Bus node 8 position

mobility.SetPositionAllocator (positionAlloc);

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

mobility.Install (busNodes);

// Set up applications (e.g., UDP echo server and client)

uint16_t port = 9; // Port number for applications

// Install UDP Echo Server on the first bus node

UdpEchoServerHelper echoServer (port);

ApplicationContainer serverApps = echoServer.Install (busNodes.Get (0));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// Install UDP Echo Clients on other bus nodes to communicate with the first bus node

for (uint32_t i = 1; i < busNodes.GetN (); ++i)

{

UdpEchoClientHelper echoClient (busInterfaces.GetAddress (0), port);

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

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

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

ApplicationContainer clientApps = echoClient.Install (busNodes.Get (i));

clientApps.Start (Seconds (2.0 + i)); // Stagger start times

clientApps.Stop (Seconds (10.0));

}

// Run simulation

Simulator::Stop (Seconds (10.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Step 5: Build and Run the Simulation

1. Save the script as extended-bus-topology.cc.
2. Build the script using waf:

./waf configure –enable-examples

./waf build

1. Run the simulation:

./waf –run scratch/extended-bus-topology

Explanation of the Script

• Node Creation: Creates eight nodes for the extended bus topology.
• CSMA Links: Configures CSMA links to connect the bus nodes, simulating a bus topology.
• Internet Stack: Installs the internet stack on all nodes.
• IP Addressing: Assigns IP addresses to the bus devices.
• Mobility Model: (Optional) Sets the position of nodes using ListPositionAllocator and ConstantPositionMobilityModel to simulate a linear layout.
• Applications: Sets up a UDP echo server on the first bus node and UDP echo clients on the other bus nodes to demonstrate communication between nodes.

The above script clearly explain about how to implement Extended Bus Topology in ns3 and how to set up this kind of network using bus topology principles.

Having trouble with Extended Bus Topology in ns3? Reach out to us at ns3simulation.com for expert assistance. Our team of developers is dedicated to helping you succeed. Plus, we can provide insights on how Extended Bus Topology fares in various simulation tools.