How to Start Bus Topology Projects Using NS3

To start a Bus Topology project in NS3 that has numerous steps. We can follow these detailed instructions:

Steps to Start Bus Topology Projects in NS3

Step 1: Set Up NS3

  1. Install NS3:
    • Go to the NS3 webpage to download and install NS3 on the system.
    • Make sure that necessary dependencies like Python, C++, and essential libraries are installed.
  2. Verify Installation:
    • Execute an example NS3 script to make certain the installation properly working .

./waf –run scratch/my_first

Step 2: Understand the Bus Topology

  • Bus Topology associates every device to a single interaction line like the “bus”.
  • Interaction is shared to sense devices send and obtain through the similar channel.

Step 3: Plan Your Project

  • Define the objectives of the project:
    • In a bus topology, replicate the data transmission.
    • Estimate the metrics such as throughput, delay, and packet loss.
    • Launch failure scenarios or focus on the behavior of protocol.
  • Choose protocols like:
    • Ethernet (CSMA/CD).
    • Wi-Fi in ad hoc mode (if replicating the wireless).

Step 4: Create the Topology in NS3

  1. Create Nodes: Make the devices to utilize NS3 NodeContainer.

NodeContainer nodes;

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

  1. Connect Nodes with CSMA: Mimic the bus topology to utilize NS3’s CsmaHelper.

CsmaHelper csma;

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

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

  1. Install NetDevices: We can install the CSMA devices on the nodes.

NetDeviceContainer devices;

devices = csma.Install(nodes);

  1. Assign IP Addresses: Able to allocate an IP addresses to the devices.

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“192.168.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

Step 5: Set Up Applications

  1. Install Applications: Make traffic among the nodes to utilize UDP or TCP applications.

UdpEchoServerHelper echoServer(9);

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

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), 9);

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

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

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

ApplicationContainer clientApps = echoClient.Install(nodes.Get(1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

Step 6: Simulate and Analyze

  1. Run the Simulation:

Simulator::Run();

Simulator::Destroy();

  1. Collect Results:
    • Examine the simulation to utilize trace files (.pcap).
    • Allow logging to seize the certain behaviors.

csma.EnablePcap(“bus_topology”, devices.Get(1), true);

Step 7: Enhance the Simulation

  • We need to append realistic traffic patterns such as FTP, HTTP.
  • Launch the link failures and then estimate the retrieval.
  • We can equate the performance of bus topology including other topologies.

Step 8: Test and Debug

  • Several times we execute the script including diverse parameters.
  • Debug to utilize logging framework in NS3.

export NS_LOG=”CsmaHelper=level_all|prefix_func”

./waf –run scratch/bus_topology

Step 9: Document Your Work

  • It offers an in-depth clarification of the script, metrics and outcomes.
  • Also, it contains visualizations such as graphs for throughput, delay, or packet loss.

Example: Minimal NS3 Script for Bus Topology

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/csma-module.h”

#include “ns3/internet-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

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

NodeContainer nodes;

nodes.Create(5);

CsmaHelper csma;

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

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

NetDeviceContainer devices = csma.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“192.168.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

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

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), 9);

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

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

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

ApplicationContainer clientApps = echoClient.Install(nodes.Get(1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

csma.EnablePcap(“bus_topology”, devices.Get(1), true);

Simulator::Run();

Simulator::Destroy();

return 0;

}

We can store the script like bus_topology.cc and run it:

./waf –run bus_topology

Next Steps

  • Test with various traffic models.
  • We need to show the topology to discover visualization tools such as NetAnim.

Our team provide a basic process for Bus Topology Projects, including example code that was demonstrated and simulated using NS3 environment. We provide a comprehensive guide on how to initiate and simulate Bus Topology Projects using the NS3 tool. Our team of developers is ready to assist you in enhancing your project’s performance. Just share your project details with us, and we’ll offer you the best advice possible.