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How to Implement Flat Topology in OMNeT++

To implement the flat topology in OMNeT++ requires a network that contains each nodes are peers has no hierarchical structure or central control. Based on the features and connectivity, this topology is often used in peer-to-peer (P2P) network or in basic network in which the nodes are treated same. Follow us to get best guidance on simulation of your project.

Below is a step-by-step approach to help you executed it.

Step-by-Step Implementation:

  1. Set Up OMNeT++ and INET Framework
  • Make certain that you have OMNeT++ and the INET framework are installed and properly configured. Simulate different network topologies as well as flat topologies, we can use the INET framework that offers the necessary modules.
  1. Define the Flat Topology in a NED File
  • Create a .ned file to State the network topology. In a flat topology, each node is connected to a subset of other nodes, forming a mesh-like structure without any central control or hierarchy.

Example:

package flatTopologyExample;

import inet.node.inet.StandardHost;

network FlatTopology

{

parameters:

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

submodules:

node[numNodes]: StandardHost {

parameters:            @display(“p=200+400*cos(pi/2+i*2*pi/numNodes),200+400*sin(pi/2+i*2*pi/numNodes)”);

}

connections allowunconnected:

// Fully connect all nodes (mesh-like flat topology)

for i=0..numNodes-2 {

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

node[i].ethg++ <–> EtherChannel <–> node[j].ethg++;

}

}

}

  • Mesh-Like Connectivity: In this flat topology, each node is connected to every other node, creating a fully connected (or partially connected, if desired) mesh network. This make sure that all nodes are peers, with no central controller.
  1. Configure the Nodes in OMNeT++ INI File
  • Configure the characteristics of the nodes like IP addresses and the applications they will run in the omnetpp.ini file.

Example:

network = flatTopologyExample.FlatTopology

# Configure IP addresses

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

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

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

# Example application setup: node 0 communicates with node 3

*.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 sample:
    • node[0] is configured to send UDP packets to node[3].
    • The network is flat, meaning that no node has special control or hierarchy over others.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ after setting up the network topology and configuration,. Monitor the peer-to-peer communication among nodes and how the flat topology permits for decentralized data exchange.
  1. Analyze the Results
  • Visualize and analyze the network traffic by using in-built tools of OMNeT++. Examine how data is transmitted between nodes, how network performance scales as more nodes are added, and how the absence of a central controller affects network behavior.
  1. Enhancements and Variations
  • Scalability Testing: Raise the number of nodes to examine the scalability of the flat topology. Evaluate how the network manages increased traffic and node density.
  • Partial Connectivity: We have to generate a partially connected flat topology by altering the connections. In this topology, not all nodes is linked to every other node however no node is central or hierarchical.
  • Failure Scenarios: Introduce node or link failures to see how the network acts deprived of centralized control and how resilient the flat topology is to troubles.

Example Files

  1. FlatTopology.ned: Defines the flat topology.
  2. omnetpp.ini: Has configuration settings for the simulation.

Finally, we utterly give the basic network simulation to implement the flat topology in the OMNeT++ and how to include protocols in the topology and how it impacted on the results. We will offer any extra information about this process, if needed.

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