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How to Implement Circular Topology in OMNeT++

To implement the circular topology in OMNeT++ has requires to includes generating a network where each node is connected to accurately two other nodes, making a closed loop or ring. It is frequently talk about to as a ring topology, where data travels around the loop in one or both directions until it reaches its end.

Given below is a procedure about how to implement a circular (ring) 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 different network topologies, with ring networks.
  1. Define the Circular Topology in a NED File
  • Build a .ned file to state the network topology. In a circular topology, each node is connected to its instant neighbours, forming a loop.

Example:

package circularTopologyExample;

import inet.node.inet.StandardHost;

import inet.linklayer.ppp.Ppp;

network CircularTopology

{

parameters:

int numNodes = default(6);  // Number of nodes in the circular topology

submodules:

node[numNodes]: StandardHost {

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

}

connections allowunconnected:

// Connect each node to its neighbor to form a ring

for i=0..numNodes-2 {

node[i].pppg++ <–> Ppp <–> node[i+1].pppg++;

}

// Connect the last node to the first to complete the ring

node[numNodes-1].pppg++ <–> Ppp <–> node[0].pppg++;

}

  • In this example:
    • StandardHost is used to denote each node in the network.
    • Ppp (Point-to-Point Protocol) connections are used to straightly connect neighbouring nodes, making a ring.
    • The nodes are arranged in a circular pattern using trigonometric functions for visual clarity.
  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 = circularTopologyExample.CircularTopology

# 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 node 3 through the ring

*.node[0].numApps = 1

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

*.node[0].app[0].destAddresses = “10.0.0.4”  # IP address of node[3]

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

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

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

*.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 node[3], which is three hops away in the ring.
    • node[3] is process the packets and  configured to receive.
  1. Run the Simulation
  •  Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see all nodes connected in a circular loop, with data traveling around the ring.
  1. Analyse the Results
  • To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how data is transmitted around the ring, the latency included in reaching various nodes, and how the network manages traffic.
  1. Enhancements and Variations
  • Bidirectional Communication: Set up bidirectional communication where data can travel in both directions around the ring, developing fault tolerance.
  • Performance Analysis: Calculate the performance of the network in terms of throughput, latency, and packet loss under various traffic conditions.
  • Fault Tolerance: Mimic a situation where one of the nodes or links fails and watch how the network reroutes traffic and maintains connectivity.

Example Files

  1. CircularTopology.ned: Describes the circular topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

In this section, we had provide more details like generating a network, define network topology in NED file, visualization in network traffic and some examples to execute Circular Topology in OMNeT++. We provide comprehensive implementation and simulation assistance across all aspects of Circular Topology within the OMNeT++ framework. Share the specifics of your project with us, and we will offer expert guidance tailored to your needs. Discover the best project ideas as we present top topics related to Circular Topology