How to Simulate Hierarchical Star Topology Using OMNeT++

To simulate a Hierarchical Star Topology using OMNeT++ that consists of modeling a central node (hub or switch) with numerous star sub-topologies are connected in a hierarchy. Each star topology associates a central node to multiple other nodes (end devices), and in the hierarchical configuration, several such star topologies are connected.We have all the updated tools and resources to provide you utmost simulation guidance get customized services from us.

The followings are the simulation steps to replicate a Hierarchical Star Topology in OMNeT++:

Steps to Simulate Hierarchical Star Topology in OMNeT++:

1. Install OMNeT++: Make certain that OMNeT++ is installed on the system.
2. Create a New Project:
   • We can open OMNeT++ and make a new OMNeT++ project.
   • Name the project correctly (e.g., HierarchicalStarTopologySimulation).
3. Define the Topology in NED File:
   • The NED (Network Description) file defines the structure of the network.
   • In a Hierarchical Star Topology, we will have a main central node (e.g., root switch or router) connecting to numerous secondary star networks.

Here’s an instance of a Hierarchical Star Topology in OMNeT++:

package hierarchicalstar;

import inet.node.inet.StandardHost;

import inet.node.ethernet.EtherSwitch;

network HierarchicalStarTopology

{

types:

channel StarLink extends ned.DatarateChannel {

delay = 5us;  // link delay between nodes

datarate = 100Mbps;  // link data rate

}

submodules:

// Main Central Hub/Router

mainHub: EtherSwitch;

// Sub-Star Networks (Central hubs for each star topology)

hub1: EtherSwitch;

hub2: EtherSwitch;

hub3: EtherSwitch;

// Hosts in Star Topology 1

host1: StandardHost;

host2: StandardHost;

host3: StandardHost;

// Hosts in Star Topology 2

host4: StandardHost;

host5: StandardHost;

host6: StandardHost;

// Hosts in Star Topology 3

host7: StandardHost;

host8: StandardHost;

host9: StandardHost;

connections:

// Connect mainHub to the sub-star hubs

mainHub.ethg++ <–> StarLink <–> hub1.ethg++;

mainHub.ethg++ <–> StarLink <–> hub2.ethg++;

mainHub.ethg++ <–> StarLink <–> hub3.ethg++;

// Star Topology 1 connections

hub1.ethg++ <–> StarLink <–> host1.ethg++;

hub1.ethg++ <–> StarLink <–> host2.ethg++;

hub1.ethg++ <–> StarLink <–> host3.ethg++;

// Star Topology 2 connections

hub2.ethg++ <–> StarLink <–> host4.ethg++;

hub2.ethg++ <–> StarLink <–> host5.ethg++;

hub2.ethg++ <–> StarLink <–> host6.ethg++;

// Star Topology 3 connections

hub3.ethg++ <–> StarLink <–> host7.ethg++;

hub3.ethg++ <–> StarLink <–> host8.ethg++;

hub3.ethg++ <–> StarLink <–> host9.ethg++;

}

Explanation of the NED File:

1. Main Hub: The mainHub performs as the central hub associating to the secondary hubs (or switches) in each star topology.
2. Secondary Hubs: hub1, hub2, and hub3 are the centers of their own star topologies that associating to the hosts in their corresponding stars.
3. Hosts: Nodes (host1 to host9) are connected in a star formation to their respective hubs.
4. Connections: The connections are described using the StarLink channel that has indicated delays and data rates.
5. StarLink: This describes the properties of the link (e.g., delay, datarate) used among all connections.

4. Simulation Configuration in INI File:

We require to set up the simulation in the omnetpp.ini file. Configure simulation metrics, like duration, network settings, and so on.

[General]

network = hierarchicalstar.HierarchicalStarTopology

sim-time-limit = 100s

**.ethg.mtu = 1500B

5. Run the Simulation:

• When the topology is described then we build and run the project.
• We can investigate the outcomes like the throughput, delay, or packet loss, using OMNeT++’s built-in analysis tools.

6. Extend the Model:

We can further prolong the model by inserting more layers to the hierarchy, testing with distinct channel types, or integrating traffic generators to replicate data flow among the nodes.

We had demonstrated the above simulation process that helps you to simulate the Hierarchical Star Topology projects and to prolong the model using OMNeT++ simulator. Further in-depth details will also be made available.