How to Start Bus-Star Hybrid Topology Projects Using OMNeT++

To create a Bus-Star Hybrid Topology project using OMNeT++ has includes for associate the elements of bus topology for sample shared backbone and star topology such as centralized connections we create a hybrid network. This topology is generally used in the industrial applications, office networks, and educational institutions.

Steps to Start Bus-Star Hybrid Topology Projects Using OMNeT++

  1. Set up OMNeT++
  1. Install OMNeT++:
    • Download and install the latest version from the official site.
    • Setting and validate the environment through sample replication.
  2. Install INET Framework:
    • The INET offers the models for a wired and wireless communication.
    • Install and compile the INET framework from GitHub.
  1. Understand Bus-Star Hybrid Topology
  • Bus Segment: The linear backbone which joins the several for star networks.
  • Star Segment: A central switch or hub joined the many devices in the segment.
  • Hybrid Connection: The star parts are connected through the support of bus.
  1. Define the Hybrid Topology in NED

Use NED (Network Description Language) we state the hybrid topology. A Bus connects Star segments.

Example: Basic Hybrid Topology

network BusStarHybrid

{

submodules:

busSwitch: EtherSwitch {

@display(“p=300,100;i=device/switch”);

}

star1Switch: EtherSwitch {

@display(“p=100,200;i=device/switch”);

}

star2Switch: EtherSwitch {

@display(“p=500,200;i=device/switch”);

}

host1[3]: StandardHost {

@display(“p=50,300;i=device/pc”);

}

host2[3]: StandardHost {

@display(“p=450,300;i=device/pc”);

}

connections:

// Bus connections

busSwitch.ethg++ <–> star1Switch.ethg++;

busSwitch.ethg++ <–> star2Switch.ethg++;

// Star segment 1 connections

host1[0].ethg++ <–> star1Switch.ethg++;

host1[1].ethg++ <–> star1Switch.ethg++;

host1[2].ethg++ <–> star1Switch.ethg++;

// Star segment 2 connections

host2[0].ethg++ <–> star2Switch.ethg++;

host2[1].ethg++ <–> star2Switch.ethg++;

host2[2].ethg++ <–> star2Switch.ethg++;

}

  1. Configure Simulation Parameters

Set replication parameters metrices in the omnetpp.ini file.

Example Configuration:

[General]

network = BusStarHybrid

sim-time-limit = 100s

# Ethernet link settings

**.eth[*].datarate = 1Gbps

**.eth[*].delay = 1ms

 

# Traffic generation for hosts

*.host1[0].numApps = 1

*.host1[0].app[0].typename = “UdpBasicApp”

*.host1[0].app[0].destAddresses = “host2[1]”

*.host1[0].app[0].messageLength = 512B

*.host1[0].app[0].sendInterval = exponential(1s)

  1. Implement Custom Behavior (Optional)

If need the replication and detailed behavior such as failure detection or custom traffic patterns, execute it using C++.

Example: Custom Switch Logic

void CustomSwitch::handlePacket(cMessage *msg) {

if (isBroadcast(msg)) {

broadcastPacket(msg);

} else {

forwardPacketToPort(msg, lookupPort(msg));

}

}

  1. Add Traffic Generation

Congestion is replicating the congestion with star segments using application modules such as UdpBasicApp or TcpApp.

Example Traffic Configuration:

*.host1[1].numApps = 1

*.host1[1].app[0].typename = “TcpBasicClientApp”

*.host1[1].app[0].connectAddress = “host2[2]”

*.host1[1].app[0].startTime = 5s

*.host1[1].app[0].numPackets = 100

  1. Run and Visualize the Simulation
  1. Run the Simulation:
    • Used the OMNeT++ IDE we apply the replication.
    • Monitor the packet flow and interaction among the bus and star segments.
  2. Visualize Topology:
    • Validate the logical and physical connections by OMNeT++’s graphical interface.
  1. Analyze Results
  • Metrics to Monitor:
    • It follows on the Packet delivery ratio.
    • The network has involves the latency and throughput.
    • The load of congestion for the support to bus and star switches.
  • Failure Analysis:
    • Connections are replicate or failures are the node and examine the effect of transmission.
  1. Extend the Project

Improve the replication according to the project goals:

  • Scalability:
    • Enhance the number of star segments or hosts we validate the performance.
  • Fault Tolerance:
    • Improve the redundancy for support of bus or star connections.
  • Advanced Protocols:
    • The VLANs, QoS, or load balancing mechanisms replicate the protocols.
  • Security:
    • Encode for apply or authentication among the segments.
  1. Document the Project
  • Obviously the document involves the topology, settings, and replication outcomes.
  • It contains the performance parameter metrics and follows the report.

Example Use Cases

  1. Campus Networks:
    • A hybrid network for replicating the architecture connected through a support for central bus.
  2. Industrial Automation:
    • Design the factory floors by several control units connected through a support the distribution.
  3. IoT Deployments:
    • Associate the local IoT hubs by a central backbone for the data aggregation.

This step-by-step guide ensures a systematic approach to designing, simulating, and analyzing a Bus-Star Hybrid Topology project in OMNeT++. Start with the basic configuration and gradually enhance the simulation as needed.

In conclusion, we had learnt and understood how to implement the Bus-Star Hybrid topology in OMNeT++ that has used the industrial applications and educational institutions. That was implemented by OMNeT++ framework. Also we offer the all kinds of information regarding the Bus-Star Hybrid topology.