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How to Implement Ring Topology in OMNeT++

To implement a ring topology in OMNeT++ has needs to generate a network where each node is interlinked to exactly two other nodes that establishing a closed loop or ring. Data travels in one direction (or both directions in a bidirectional ring) around the ring up until it extends its destination. In the below is the structure to implement the ring topology using OMNeT++:

Step-by-Step Implementation:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and properly configured. The INET framework offers the essential modules for mimicking many network topologies and protocols.
  1. Define the Ring Topology in a NED File
  • Generate a .ned file to state the network topology. In a ring topology, each node is connected to two other nodes, forming a loop.

Example:

package ringTopologyExample;

import inet.node.inet.StandardHost;

network RingTopology

{

parameters:

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

submodules:

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:

for i=0..numNodes-2 {

node[i].ethg++ <–> Eth10G <–> node[i+1].ethg++;

}

node[numNodes-1].ethg++ <–> Eth10G <–> node[0].ethg++;  // Close the ring

}

  • In this example:
    • StandardHost is used to represent each node in the ring.
    • Nodes are placed around a circular pattern to visually represent the ring.
    • The connections block connects each node to the next, with the last node connecting back to the first node to form a ring.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes. We need to specify IP addresses, applications running on the nodes, and other relevant parameters.

Example:

network = ringTopologyExample.RingTopology

# Configure IP addresses and routing (assuming IPv4)

*.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 2 via the ring

*.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[2].numApps = 1

*.node[2].app[0].typename = “UdpSink”

*.node[2].app[0].localPort = 5000

  • In this example:
    • node[0] is configured to send UDP packets to node[2] via the ring.
    • Each node is assigned a unique IP address, which can be configured manually or automatically using a script or tool.
  1. Run the Simulation
  • After setting up the network topology and configuration compile and execute the simulation in OMNeT++. We need to see all nodes connected in a loop, with data being sent around the ring from one node to another.
  1. Analyze the Results
  • Use OMNeT++’s built-in tools to visualize and assess the network traffic. We should investigate how data flows via the ring, the latency, and how the ring topology manages traffic.
  1. Enhancements and Variations
  • Unidirectional vs. Bidirectional Ring: In the sample above, data can only flow in one direction. We need to modify the topology to permits bidirectional communication by adding extra connections in the opposite direction.
  • Fault Tolerance: Simulate a scenario where one node or connection fails and monitor how the network manages the fault. In a ring topology, redundancy can be introduced to preserve connectivity in the event of a failure.
  • Performance Analysis: Evaluate the performance of the network in terms of throughput, latency, and node load under numerous traffic conditions.

Example Files

  1. RingTopology.ned: Explains the ring topology.
  2. omnetpp.ini: Contains configuration settings for the simulation.

In the above procedures will demonstrate how to complete the implementation process for ring topology using the OMNeT++ tool. We will intend to provide the more information about the ring topology.

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