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How to Implement Mesh Topology in OMNeT++

To implement a mesh topology in OMNeT++ has needs to generate the network wherever the each node is interlinked with multiple nodes and that forms the complex web of connections and the mesh topologies are highly redundant, which upsurges reliability and fault tolerance, as there are multiple paths for data to travel among any two nodes. The given below are the brief procedures on how to implement the mesh topology in OMNeT++:

Step-by-Step Implementation:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and configured on the system. The INET framework delivers the essential modules for emulating numerous network topologies and protocols.
  1. Define the Mesh Topology in a NED File
  • Generate a .ned file to describe the network topology. In a mesh topology, each node can connect to multiple other nodes that forming a mesh network.

Example:

package meshTopologyExample;

import inet.node.inet.StandardHost;

network MeshTopology

{

parameters:

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

submodules:

node[numNodes]: StandardHost {

parameters:

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

}

connections allowunconnected:

for i=0..numNodes-2 {

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

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

}

}

}

  • In this example:
    • StandardHost is used to signify each node in the mesh network.
    • Nodes are placed in a circular pattern for visual clarity, but the connections form a full mesh, where each node is connected to every other node.
  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, routing protocols, applications running on the nodes, and other relevant parameters.

Example:

network = meshTopologyExample.MeshTopology

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

*.node[*].ipv4.routingTable.netmask = “255.255.255.0”

# Configure automatic IP assignment

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

# Example application setup: node 0 sends data to node 3

*.node[0].numApps = 1

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

*.node[0].app[0].destAddresses = “10.0.0.3”

*.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 example:
    • node[0] is configured to send UDP packets to node[3].
    • An XML file (IPv4Config.xml) is used for IP address assignment and routing configuration.
  1. Configure Routing Protocols
  • In a mesh topology, dynamic routing protocols such as OSPF (Open Shortest Path First) or AODV (Ad-hoc On-demand Distance Vector) are used to identify the best path among nodes. we can enable and configure these protocols in omnetpp.ini file.

Example configuration for OSPF:

*.node[*].hasOspf = true

*.node[*].ospf.area = 0.0.0.0

Example configuration for AODV (useful in wireless mesh networks):

*.node[*].hasAodv = true

  • These configurations enable the respective routing protocols on all nodes in the network.
  1. Run the Simulation
  • After setting up the network topology and configuration compile and run the simulation in OMNeT++. We need to see all nodes connected in a mesh, with data being transmitted via multiple possible paths.
  1. Analyze the Results
  • Use OMNeT++’s built-in tools to visualize and evaluate the network traffic. We need to investigate how information flows through multiple paths in the mesh, how routing protocols adjust to changes, and the overall reliability and fault tolerance of the network.
  1. Enhancements and Variations
  • Partial Mesh Topology: Instead of a full mesh, generate a partial mesh where each node is connected to a subset of other nodes, which is more common in practical mesh networks.
  • Fault Tolerance Testing: Mimic node failures and spot how the network adapts and reroutes traffic.
  • Performance Analysis: Measure the performance of the network in terms of throughput, latency, and network load under varying traffic conditions.

Example Files

  1. MeshTopology.ned: Describes the mesh topology.
  2. omnetpp.ini: Contains configuration scenario for the simulation.

In the above information were provided the information about how the mesh topology will perform in the OMNeT+ tool and also we offer the complete snippets to implement the mesh topology. If you need additional details about the mesh topology we will support and provide that too.

Team at omnet-manual.com is here to assist you with implementing Mesh Topology in the OMNeT++ tool for your projects. Reach out to us to ensure you get the best results in your simulations and comparison analyses.