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How to Implement Daisy Chain Topology in OMNeT++

To implement the daisy chain topology in OMNeT++ has includes forming a network where each node is connected to accurately two other nodes, but not for the nodes at the ends of the chain, which are connected to unique other node. This is same to a linear bus topology but without the shared medium; each connection is a devoted link between two nodes.

The following steps are help how to implement a daisy chain 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 required modules for mimicking point-to-point connections, which are needed for making a daisy chain topology.
  1. Define the Daisy Chain Topology in a NED File
  • Make a .ned file to define the network topology. Each node is connected to the next node in line, forming a linear chain in a daisy chain topology

Example:

package daisyChainTopologyExample;

import inet.node.inet.StandardHost;

import inet.linklayer.ppp.Ppp;

network DaisyChainTopology

{

parameters:

int numNodes = default(5);  // Number of nodes in the daisy chain

submodules:

node[numNodes]: StandardHost {

parameters:

@display(“p=100+200*i,200”);

}

connections allowunconnected:

for i=0..numNodes-2 {

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

}

}

  • In this example:
    • StandardHost denotes each node in the chain.
    • Ppp is used to launch a point-to-point connection between consecutive nodes.
    • The nodes are placed in a horizontal line for optical clarity, and each node is connected to its next neighbour.
  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 = daisyChainTopologyExample.DaisyChainTopology

# 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 the last node in the chain

*.node[0].numApps = 1

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

*.node[0].app[0].destAddresses = “10.0.0.5”  # IP address of the last node

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

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

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

*.node[4].numApps = 1

*.node[4].app[0].typename = “UdpSink”

*.node[4].app[0].localPort = 5000

  • In this example:
    • node[0] is configured to send UDP packets to node[4], the end node in the chain.
    • node[4] is configured to receive and process the packets.
  1. Run the Simulation
  • In a daisy chain topology, compile and run the simulation in OMNeT++ in a daisy chain topology. We should see all nodes connected in a linear chain, with data flowing from the initial node to the terminal node.
  1. Analyse the Results
  • To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how data is transmitted across each link in the chain, the latency included in reaching the last node, and how the network manages traffic.
  1. Enhancements and Variations
  • Bidirectional Communication: Set up bidirectional communication from both their neighbours where nodes can send and receive data.
  • Performance Analysis: Calculate the performance of the network in terms of throughput, latency, and packet loss under various traffic conditions.
  • Fault Tolerance: Mimic a scenario where one of the nodes or links fails and view how the network behaves, especially in terms of data delivery.

Example Files

  1. DaisyChainTopology.ned: Describes the daisy chain topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

In this notes, we had demonstrate, define topology, configure the nodes, and visualize the results in OMNeT. We will offer to provide innovative information about Daisy Chain Topology in other tools.

You can find implementation and simulation support for all Daisy Chain Topology in the OMNeT++ tool, thanks to the folks at omnet-manual.com. Feel free to reach out if you need help brainstorming project ideas in this area!

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