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How to Implement Cluster Topology in OMNeT++

To implement the cluster topology in OMNeT++ is encompasses making a network where nodes are categorized into clusters, with each cluster having a cluster head or a central node that handles communication in the cluster and possibly with other clusters. Cluster topology is frequently used in wireless sensor networks and distributed systems.

Below is a procedure to implement a cluster 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 delivers the essential modules for simulating several network topologies, with clustered networks.
  1. Define the Cluster Topology in a NED File
  • Make a .ned file to define the network topology. Each cluster has a cluster head that connects to other nodes within the cluster in a cluster topology.

Example:

package clusterTopologyExample;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network ClusterTopology

{

parameters:

int numClusters = default(3);  // Number of clusters

int numNodesPerCluster = default(4);  // Number of nodes per cluster

submodules:

clusterHead[numClusters]: Router {

parameters:

@display(“p=200+400*i,100”);

}

node[numClusters][numNodesPerCluster]: StandardHost {

parameters:

@display(“p=100+100*j+400*i,300”);

}

connections allowunconnected:

// Connect each node to its respective cluster head

for i=0..numClusters-1 {

for j=0..numNodesPerCluster-1 {

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

}

}

// Optionally, connect cluster heads to each other

for i=0..numClusters-2 {

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

}

}

  • In this example:
    • Router is used to denote the cluster heads.
    • StandardHost represents the separate nodes in each cluster.
    • The nodes in each cluster are connected to their corresponding cluster head, which may also connectto other cluster heads.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes, like IP addresses, routing, and the applications they will run.

Example:

[General]

network = clusterTopologyExample.ClusterTopology

# Configure IP addresses and routing

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

*.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][0] in one cluster sends data to node[1][0] in another cluster

*.node[0][0].numApps = 1

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

*.node[0][0].app[0].destAddresses = “10.0.0.5”  # IP address of node[1][0]

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

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

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

*.node[1][0].numApps = 1

*.node[1][0].app[0].typename = “UdpSink”

*.node[1][0].app[0].localPort = 5000

  • In this example:
    • node[0][0] in the first cluster is configured to send UDP packets to node[1][0] in other cluster.
    • node[1][0] is configured to receive and process the packets.
  1. Configure Routing Protocols
  • Depends on the complexity of the cluster topology, we may need to configure routing protocols to handle how data is forwarded in and between clusters such as  we can permit OSPF (Open Shortest Path First) or other suitable protocol.

Example:

*.clusterHead[*].hasOspf = true

*.node[*][*].hasOspf = true

  • This configuration enables OSPF on all cluster heads and nodes, permitting dynamic routing across the clustered network.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see nodes grouped into clusters, with data being routed over the cluster heads.
  1. Analyze the Results
  • To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how the cluster heads manage the traffic, how data is transmitted within and between clusters, and the overall performance of the cluster topology.
  1. Enhancements and Variations
  • Cluster Head Selection: Execute dynamic cluster head selection algorithms where nodes in the cluster elect a cluster head based on conditions like energy level, proximity, or load.
  • Inter-Cluster Communication: Look at various ways to manage inter-cluster communication, like direct communication between cluster heads or routing through a central node.
  • Scalability: Test with adding extra nodes or clusters to see how the topology scales with rising network size.

Example Files

  1. ClusterTopology.ned: Describes the cluster topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

Finally, we had execute how to define cluster topology in NED file, configure routing protocols, and nodes in OMNeT++ in the step-by-step procedure. We will present informations about Cluster Topology in other tools depends your desires. The developers at omnet-manual.com provide implementation and simulation support for all Cluster Topology within the OMNeT++ tool.

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