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How to Implement Star Topology in OMNeT++

To implement a star topology in OMNeT++ has numerous steps to follow that contain to generate a network where multiple nodes (clients) are interconnected to a central node (a hub or switch) that helps as the communication hub for all nodes in the network and the star topology, all information is transferred among nodes passes through the central node. The given below is the structured procedure to implement the star topology in OMNeT++ using the INET framework:

Step-by-Step Implementation:

  1. Set Up OMNeT++ and INET Framework
  • Ensure that OMNeT++ and the INET framework are installed and properly configured. The INET framework provides the necessary modules for simulating various network topologies and protocols.
  1. Define the Star Topology in a NED File
  • Create a .ned file to define the network topology. In a star topology, all nodes are connected to a central node (hub/switch).

Example:

package starTopologyExample;

 

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

 

network StarTopology

{

parameters:

int numNodes = default(5);  // Number of peripheral nodes in the star topology

submodules:

configurator: Ipv4NetworkConfigurator {

parameters:

@display(“p=100,100”);

}

centralNode: Router {

parameters:

@display(“p=400,300”);

}

node[numNodes]: StandardHost {

parameters:

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

}

connections allowunconnected:

for i=0..numNodes-1 {

node[i].ethg++ <–> Eth10G <–> centralNode.ethg++;

}

}

  • In this example:
    • Router is used as the central node. You could also use a Switch or Hub depending on the specific network behavior you want to simulate.
    • StandardHost represents each client node.
    • Nodes are placed around the central node in a circular pattern for visual clarity.
  1. Configure the Nodes and Central Node in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes and the central node. You can specify IP addresses, applications running on the nodes, and other relevant parameters.

Example:

[General]

network = starTopologyExample.StarTopology

 

*.configurator.config = xmldoc(“IPv4Config.xml”)

 

# Configure node IP addresses (if not using automatic assignment)

*.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].numApps = 1

*.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[1].numApps = 1

*.node[1].app[0].typename = “UdpSink”

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

  • In this example:
    • node[0] is configured to send UDP packets to node[1] via the central node.
    • The IPv4Config.xml file (not shown here) is used to configure IP addresses automatically or manually.
  1. Run the Simulation
  • After setting up the network topology and configuration, compile and run the simulation in OMNeT++. You should see all nodes connected to the central node, with data being sent through the central node.
  1. Analyze the Results
  • Use OMNeT++’s built-in tools to visualize and analyze the network traffic. You can examine how data flows through the central node and how each peripheral node receives and processes the data.
  1. Enhancements and Variations
  • Central Node Failure: Simulate a scenario where the central node fails and observe the impact on network communication.
  • Performance Analysis: Measure the performance of the network in terms of throughput, latency, and central node load under varying traffic conditions.
  • Dynamic Topology: Experiment with adding and removing nodes dynamically to see how the star topology handles changes.

Example Files

  1. StarTopology.ned: Defines the star topology.
  2. omnetpp.ini: Contains configuration settings for the simulation.

In the conclusion, we had help walk you to implement the star topology in OMNeT++ simulator that connects with the multiple needs to transfer the information to the central node. More information about star topology will be shared according to your needs.

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