To simulate a Circular Topology using OPNET encompasses to configure a network in which every node is associated to accurately two other nodes to make a closed loop. Circular Topology is also named as a Ring Topology, which information moves either unidirectional or bidirectionally around the circle, to offer the redundancy. Circular topology is generally utilized within networks to need resilience, since information can reroute within the reverse direction if a link fails.
Below is a step-by-step process to simulate a circular topology in OPNET:
Steps to Simulate Circular Topology Projects in OPNET
- Set Up OPNET Environment
- Make a new project then name it that related to “Circular Topology Simulation” in OPNET Modeler.
- Set up the workspace in a circular or ring layout to contain the nodes organized.
- Design the Circular Topology Structure
- Add Nodes (Devices):
- Insert devices like workstations, servers, routers, or switches, which will make the circular topology.
- In a circle, organize the nodes in which each node associates to their instant neighbors on both sides.
- Connect Nodes in a Loop:
- In a circular sequence, link each node to the next including the last node associating again to the initial node to make a closed loop.
- Configure Links Between Nodes
- Point-to-Point Links:
- Associate each node to its two nearby nodes, to make a continuous loop utilizing point-to-point links.
- Link Type and Speed:
- Select the proper link types and speeds according to the network needs:
- Ethernet (e.g., 10 Mbps or 100 Mbps) for normal LAN situations.
- For high-bandwidth requirements, we can utilize Fiber Optic Links or Gigabit Ethernet.
- Select the proper link types and speeds according to the network needs:
- Full-Duplex Configuration:
- Configure each link to full-duplex mode, to permit the concurrent data flow on both directions.
- Link Properties:
- Depending to network requirements, set up transmission speed and latency. Higher speeds at the links including heavy traffic can enhance the data flow efficiency.
- Assign Applications and Configure Traffic Patterns
- In the network, utilize an Application Configuration to describe the kinds of applications, like:
- HTTP or HTTPS for web traffic.
- FTP for file transfers.
- VoIP for real-time communication.
- Database Access for resource-intensive applications.
- Allocate certain applications for each node using Profile Configuration, to find out which nodes perform like senders or receivers.
- For instance, one node could perform like an FTP server whereas other nodes are act as clients requesting files from it.
- Enable Data Collection for Monitoring and Analysis
- Configure data collection parameters to observe the performance of network over the ring:
- Throughput: Estimate the total number of data sent through every link computing the data flow efficiency.
- Link Utilization: We can monitor utilization at every link identifying if specific links experience higher traffic loads.
- Latency and Delay: Observe end-to-end latency among nodes knowing data moving time over the circular topology.
- Packet Loss: Calculate the packet loss through each link detecting any data transmission issues, particularly in high traffic loads.
- Configure Node and Link Properties
- Server Node (Optional):
- If replicating a client-server communication then configure one node like a server such as FTP or HTTP server and other nodes like clients, which access resources at the server.
- Client Nodes:
- Set up other nodes to transmit requests occasionally or from the server obtain information to replicate a normal network data flow.
- Traffic Generation Parameters:
- Modify traffic generation rates depends on the anticipated network usage. For example, nodes can occasionally transmit requests or replciate a continuous data stream.
- Introduce Traffic Load Testing and Fault Tolerance (Optional)
- High Traffic Load:
- Maximize data rates at specific nodes or across particular links to experiment the network’s managing of high loads. For instance, from a single server configure several nodes to download files.
- Simulate Link or Node Failure:
- Detach one of the links or nodes to experiment the fault tolerance. Information would reroute within the reverse direction sustaining connectivity in a circular topology.
- Run the Simulation
- In OPNET, execute the replication, to permit information to flow through the circular route among nodes.
- We can monitor network behavior that contains data flow, link utilization, and performance parameters over the topology.
- Analyze Results
- Assess the circular topology’s performance utilizing OPNET’s analysis tools:
- Throughput Analysis: Verify throughput at each link observing if data transmission is effective and encounters the network demands.
- Latency and Delay: Calculate delay over the network. Circular topologies can be offered low latency as data doesn’t traverse numerous nodes.
- Link Utilization: Monitor utilization at each link identifying any potential bottlenecks or overutilized links.
- Packet Loss and Reliability: Verify for packet loss, particularly in heavy loads, making sure that reliable data transmission through the circular structure.
- Experiment with Different Configurations
- Customize network settings to experiment diverse situations:
- Higher Traffic Loads: For applications, maximize data rates at specific nodes to replicate the high traffic loads and then estimate network performance under pressure.
- Different Application Types: Set up numerous applications over nodes like VoIP, FTP, HTTP, replicating combined traffic types and monitors its influence over performance.
- Unidirectional vs. Bidirectional: Configure the links replicating unidirectional traffic flow and then equate it along with bidirectional flow to monitor how it impacts the performance.
We successfully completed the simulation and analysis of Circular Topology Projects using above offered simulation procedure in OPNET environment. We’re ready to deliver advanced specifics related to this project in another manual.
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