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How to Implement Bus Topology in ns3

To implement the bus topology in ns3, that contains to generate the single shared communication medium where all nodes are linked with each other. In ns3 does not support directly for bus topology as a built in features we need to simulate the bus topology used the broadcast link. This is estimated by Carrier Sense Multiple Access (CSMA) channels to connect multiple nodes in a bus-like fashion. Here, we provide the procedure on how to implement a bus topology in ns3:

Steps to Implement a Bus Topology in ns3

  1. Set Up the ns3 Environment:
    • Make sure ns3 is installed in the computer.
  2. Create the Nodes:
    • Create a set of nodes to represent devices on the bus network.
  3. Set Up the CSMA Channel:
    • Use a CSMA helper to create a single shared communication medium.
  4. Install Network Stack:
    • Install the internet stack on all nodes.
  5. Assign IP Addresses:
    • Assign IP addresses to the nodes connected to the CSMA channel.
  6. Set Up Applications:
    • Install applications to generate traffic and demonstrate communication between nodes.

Example Code

The given below is the sample on how to set up a basic network topology in ns3 using the CSMA channel:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/csma-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“BusTopologyExample”);

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (5); // Create 5 nodes

// Create a CSMA channel

CsmaHelper csma;

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

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

// Install CSMA devices

NetDeviceContainer devices;

devices = csma.Install (nodes);

// Install the internet stack on nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Create a UDP server on node 1

UdpServerHelper udpServer (9);

ApplicationContainer serverApp = udpServer.Install (nodes.Get (1));

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

// Create a UDP client on node 0

UdpClientHelper udpClient (interfaces.GetAddress (1), 9);

udpClient.SetAttribute (“MaxPackets”, UintegerValue (320));

udpClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (50)));

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

ApplicationContainer clientApp = udpClient.Install (nodes.Get (0));

clientApp.Start (Seconds (2.0));

clientApp.Stop (Seconds (10.0));

// Enable packet capture

csma.EnablePcapAll (“bus-topology”);

// Enable logging

LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation

  1. Setup: The code sets up a bus topology with five nodes connected to a single shared communication medium using CSMA.
  2. CSMA Channel: A CSMA channel is created to simulate the shared bus. The data rate and delay are configured for the channel.
  3. Network Stack: The internet stack is installed on all nodes.
  4. IP Addresses: IP addresses are assigned to the nodes connected to the CSMA channel.
  5. Applications: A UDP server is installed on node 1, and a UDP client is installed on node 0 to generate traffic and demonstrate communication.
  6. Packet Capture: Packet capture is enabled for the CSMA channel to observe network traffic.

Running the Simulation

Compile and run the simulation using the following commands in your NS-3 environment:

./waf configure

./waf build

./waf –run bus-topology-example

Replace bus-topology-example with the actual name of your script file.

Here, we understand how to implement the bus topology for broadcast link and also it was estimated by CSMA in ns3 tool. We will offer the additional detailed explanation for bus topology how it performs in other tools.

Our team of developers guarantees the best coding results for your project when implementing Bus Topology in ns3.