How to Implement Fully Connected Topology in ns3

To implement the Fully Connected Topology in ns3 has attained by setting up point-to-point links among every pair of nodes that has connected with each other in the network. It is also known as complete graph topology. The given is the step by procedures on how to implement the fully connected graph in ns3.the given below is the procedure on how to implement the fully connected topology in ns3.

Steps to Implement a Fully Connected 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 the devices in the fully connected network.
3. Set Up the Point-to-Point Channels:
   • Use point-to-point helpers to connect each node to every other node.
4. Install Network Stack:
   • Install the internet stack on all nodes.
5. Assign IP Addresses:
   • Assign IP addresses to the nodes connected by the point-to-point links.
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 setup the basic fully connected topology in ns3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“FullyConnectedTopologyExample”);

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (5); // Create 5 nodes for the fully connected network

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

InternetStackHelper stack;

stack.Install (nodes);

Ipv4AddressHelper address;

int subnet = 1;

// Connect each node to every other node

for (uint32_t i = 0; i < nodes.GetN (); ++i)

{

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

{

NetDeviceContainer devices;

devices = pointToPoint.Install (NodeContainer (nodes.Get (i), nodes.Get (j)));

std::ostringstream subnetStream;

subnetStream << “10.1.” << subnet++ << “.0”;

address.SetBase (subnetStream.str ().c_str (), “255.255.255.0”);

address.Assign (devices);

}

}

// Enable routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Create a UDP server on the last node

UdpServerHelper udpServer (9);

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

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

// Create a UDP client on the first node

UdpClientHelper udpClient (Ipv4Address (“10.1.1.2”), 9); // Assuming the IP of the last node is 10.1.1.2

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

pointToPoint.EnablePcapAll (“fully-connected-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 fully connected topology with five nodes connected by point-to-point links.
2. Point-to-Point Links: Point-to-point links are created to connect each node to every other node. The data rate and delay are configured for the links.
3. Network Stack: The internet stack is installed on all nodes.
4. IP Addresses: IP addresses are assigned to the nodes connected by the point-to-point links.
5. Applications: A UDP server is installed on the last node, and a UDP client is installed on the first node to generate traffic and demonstrate communication.
6. Packet Capture: Packet capture is enabled for the point-to-point links to observe network traffic.
7. Logging: Logging is enabled for the UDP client and server applications to provide detailed output during the simulation.

Running the Simulation

Compile and run the simulation using the following commands in your ns3 environment:

./waf configure

./waf build

./waf –run fully-connected-topology-example

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

Here, we had simulate the results for Fully Connected Topology in ns3 that has to create the network then setup and configure the point to point channels to connect with each other. Finally trace the traffic among nodes. Also we provide detailed information about how the fully connected topology performs in ns3.

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