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How to Implement Fully Connected Topology in OMNeT++

To implement the Fully Connected Topology in OMNeT++ has includes a network where in the network each node is directly connected to every other node. It is called a complete mesh topology and is symbolized by its huge level of redundancy and fault tolerance as many path occur between any two nodes.

Send us a message if you need help with performance analysis and project ideas in this field. You can also get support for implementing and simulating Fully Connected Topology using the OMNeT++ tool from the developers at omnet-manual.com.

The following steps are how to implement a fully connected topology in OMNeT++ using the INET framework:

Step-by-Step Implementations:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and correctly configured. The INET framework offers the essential modules for simulating numerous network topologies, with point-to-point connections which are necessary for making a fully connected topology.
  1. Define the Fully Connected Topology in a NED File
  • Make a .ned file to describe the network topology. In this topology, each node is connected to every other node with a direct link.

Example:

package fullyConnectedTopologyExample;

import inet.node.inet.StandardHost;

import inet.linklayer.ppp.Ppp;

network FullyConnectedTopology

{

parameters:

int numNodes = default(4);  // Number of nodes in the fully connected topology

submodules:

node[numNodes]: StandardHost {

parameters:

@display(“p=200+300*cos(pi/2+i*2*pi/numNodes),300+300*sin(pi/2+i*2*pi/numNodes)”);

}

connections allowunconnected:

for i=0..numNodes-2 {

for j=i+1..numNodes-1 {

node[i].pppg++ <–> Ppp <–> node[j].pppg++;

}

}

}

  • In this example:
    • StandardHost is used to denote each node in the network.
    • Ppp (Point-to-Point Protocol) connections are used to directly connect every pair of nodes.
    • The nodes are located in a circular form for visual clarity, but the connections form a full mesh, where each node is connected to every other node.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes, like IP addresses and the applications they will run.

Example:

[General]

network = fullyConnectedTopologyExample.FullyConnectedTopology

# Configure IP addresses

*.node[*].ipv4.arp.typename = “GlobalArp”

*.node[*].ppp[0].ipv4.address = “10.0.0.x”

*.node[*].ppp[0].ipv4.netmask = “255.255.255.0”

# Example application setup: node 0 sends data to all other nodes

*.node[0].numApps = 3

*.node[0].app[0].typename = “UdpBasicApp”

*.node[0].app[0].destAddresses = “10.0.0.2”

*.node[0].app[0].destPort = 5000

*.node[0].app[0].messageLength = 1024B

*.node[0].app[0].sendInterval = 1s

*.node[0].app[1].typename = “UdpBasicApp”

*.node[0].app[1].destAddresses = “10.0.0.3”

*.node[0].app[1].destPort = 5000

*.node[0].app[1].messageLength = 1024B

*.node[0].app[1].sendInterval = 1s

*.node[0].app[2].typename = “UdpBasicApp”

*.node[0].app[2].destAddresses = “10.0.0.4”

*.node[0].app[2].destPort = 5000

*.node[0].app[2].messageLength = 1024B

*.node[0].app[2].sendInterval = 1s

*.node[1].numApps = 1

*.node[1].app[0].typename = “UdpSink”

*.node[1].app[0].localPort = 5000

*.node[2].numApps = 1

*.node[2].app[0].typename = “UdpSink”

*.node[2].app[0].localPort = 5000

*.node[3].numApps = 1

*.node[3].app[0].typename = “UdpSink”

*.node[3].app[0].localPort = 5000

  • In this example:
    • node[0] is configured to send UDP packets to the other nodes (node[1], node[2], and node[3]).
    • The other nodes are configured to process and receive the packets.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see all nodes directly connected to each other, with data being transferred across numerous links.
  1. Analyse the Results
  • To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how data is transmitted across the fully connected network, the redundancy of connections, and how the network manages traffic.
  1. Enhancements and Variations
  • Traffic Analysis: Calculate the performance of the network in terms of throughput, latency, and load balancing under various traffic conditions.
  • Failure Scenarios: Mimic the failure of one or more links and look how the network compensates for the loss of those connections.
  • Routing Protocols: Execute routing protocols if the topology is extended or if dynamic routing is needed.

Example Files

  1. FullyConnectedTopology.ned: States the fully connected topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

In this paper, we are discussed about how to execute Fully Connected Topology in OMNeT++ using INET framework. Further informations we will offer about this topic in other tools.

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