How to Start Logical Topology Project using OMNeT++

To stimulate a Logical Topology project in OMNeT++ has contains the process and replicate a network topology in which the logical connections can be various from the physical connections for instance virtual links in optical networks or overlay networks in P2P systems. Here’s a step-by-step guide:

Steps to Start Logical Topology Project using OMNeT++

  1. Set up OMNeT++
  • Install OMNeT++: Download and install the New version of OMNeT++ from the official site.
  • Framework Selection:
    • Use INET Framework for basic networking functionalities.
    • Consider the OverSim for overlay networks or logical topologies in P2P systems.
  1. Understand Logical Topology Requirements

Logical topology suggest on how the data flows in the network, regardless of physical connections. samples are include they are:

  • Virtual Circuits are optical networks.
  • Overlay Networks in P2P or content delivery systems act as overlay network.
  • Traffic Engineering in software-defined networks (SDNs) in a congestion.

Key considerations:

  • The Logical connections are not directly map to the physical links.
  • Logical connection can be classifying the abstract relationships for instance bandwidth, latency.
  1. Define the Logical Topology
  • Signify the nodes for a logical topology for sample routers, switches, servers.
  • Explain the logical connections among nodes terms on the communication design.
  1. Create Network Topology in NED

Logical connections can be defined in the NED (Network Description Language) file.

Example: Basic Logical Topology

network LogicalTopology

{

submodules:

nodeA: Node {

@display(“p=100,100”);

}

nodeB: Node {

@display(“p=300,100”);

}

nodeC: Node {

@display(“p=200,300”);

}

connections allowunconnected:

nodeA.out++ –> nodeB.in++; // Logical link

nodeB.out++ –> nodeC.in++; // Logical link

nodeC.out++ –> nodeA.in++; // Logical link

}

  1. Configure Logical Connections

Explain the parameters of logical connections in the omnetpp.ini file:

  • Bandwidth.
  • Delay.
  • Logical link behavior.

Example:

[General]

network = LogicalTopology

sim-time-limit = 100s

**.nodeA.out++ –> **.nodeB.in++.datarate = 1Gbps

**.nodeB.out++ –> **.nodeC.in++.datarate = 500Mbps

**.nodeC.out++ –> **.nodeA.in++.delay = 10ms

  1. Model Logical Topology Behaviors

Logical topology projects often involve custom behaviors:

  • Routing and Switching:
    • Apply modify routing techniques for logical connections.
    • Replicate the virtual circuit settings.
  • Traffic Engineering:
    • Enhance the congestion distribution with logical connection.
  • Failure Simulation:
    • Replicate the logical connection or node failures and reroute traffic dynamically.

Write these behaviors in C++ modules:

void Node::handleLogicalMessage(cMessage *msg) {

// Process message for logical routing

int nextHop = findNextHop(msg);

send(msg, “out”, nextHop);

}

  1. Simulate Logical Topology in OMNeT++

Process for the replication in the OMNeT++ IDE:

  1. Monitor on the packet flow with logical links.
  2. Use animations to envision for the logical connections.
  3. Debug using the logs and communication inspection.
  1. Analyze Results
  • Gather and examine the parameter metrics like as:
    • Packet delivery ratio.
    • Utilize the logical connection.
    • Latency and throughput.
  • Use OMNeT++’s built-in tools or external tools such as Python or MATLAB for post-simulation study.
  1. Extend the Project

Depending on the experiment concentrate, expand the replication with:

  • Adding Logical Layers:
    • Replicate the multi-layer networks for sample logical on top of physical.
  • Implementing Protocols:
    • Improve the protocols for logical connection management such as SDN-based control.
  • Scalability:
    • Add the size and complexity for the logical topology.

Example Use Cases

  1. Overlay Networks: Logical connections are content distribution for the overlay of networks.
  2. Optical Networks: Logical circuits over the wavelength-division multiplexing (WDM) in a optical networks.
  3. SDN Traffic Management: Logical links are described through SDN controllers.

Tips

  • Start Small: Start by a simple logical topology and increase the improve features.
  • Modular Design: Keep the pattern modular we assign the simple debugging and scalability.
  • Leverage Frameworks: Use the previous frameworks such as INET or OverSim for advanced features.

This approach ensures a well-structured simulation of logical topologies in OMNeT++.

From the demonstration we completely aggregate the information about the installation process and simulation procedure for Logical Topology projects that were deploy in the tool of OMNeT++. Additional information regarding the Logical Topology projects will also be provided.