How to Implement network line switching in OMNeT++
To implement the network line switching in OMNeT++, we have to simulate a communication system in which the dedicated routes (circuits) are accomplished amongst nodes during communication session. It is usually used in out-dated telephone networks, however we can also be applied in data networks in particular situations.
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We offer the step-by-step guide to implementing network line switching in OMNeT++ with examples:
Step-by-Step Implementation:
- Define the Network Topology
- Nodes: Detect the nodes in the network that will behave as switches or routers.
- Links: State the physical or logical links amongst these nodes.
- Traffic: Define the type of traffic that will be switched across the network.
- Create OMNeT++ Modules for Switches and Links
- Switch Module: This module will handle the setup, management, and teardown of connections.
- Link Module: Indicates the physical or logical connection amongst two switches, managing data transmission once a path is established.
Example: Switch Module
simple Switch {
gates:
inout lineIn[4]; // Four bidirectional links for simplicity
parameters:
@display(“i=block/switch”);
}
Example: Link Module
simple Link {
gates:
inout linkIn; // Input from one switch
inout linkOut; // Output to another switch
parameters:
double dataRate @unit(“bps”) = default(1Gbps); // Data rate of the link
}
- Implement the Internal Logic of Switches
- Path Setup: Execute the logic to accomplish a path among the source and destination nodes.
- Data Transmission: Once the path is established, the switches should forward data along the reserved path.
- Path Teardown: After communication is complete, the path should be released.
Example: Switch Logic in C++
#include <omnetpp.h>
class Switch : public omnetpp::cSimpleModule {
protected:
virtual void handleMessage(omnetpp::cMessage *msg) override;
virtual void setupPath(int src, int dest); // Example method to set up a path
};
Define_Module(Switch);
void Switch::handleMessage(omnetpp::cMessage *msg) {
// Process incoming messages to establish, forward, or tear down a path
int src = msg->par(“src”);
int dest = msg->par(“dest”);
if (strcmp(msg->getName(), “setup”) == 0) {
// Setup path logic
setupPath(src, dest);
} else {
// Forward data along the established path
int nextHop = … // Determine next hop based on the established path
send(msg, “lineIn”, nextHop);
}
}
void Switch::setupPath(int src, int dest) {
// Logic to establish a path from src to dest
// This may involve reserving resources on links and setting routing tables
}
- Implement the Link Logic
- Data Transmission: Simulate the transmission of data packets over the link, containing any delays as per the data rate.
- Error Handling: Optionally, simulate link failures or errors and how they are managed.
Example: Link Logic in C++
#include <omnetpp.h>
class Link : public omnetpp::cSimpleModule {
protected:
virtual void handleMessage(omnetpp::cMessage *msg) override;
};
Define_Module(Link);
void Link::handleMessage(omnetpp::cMessage *msg) {
// Simulate data transmission delay
double dataRate = par(“dataRate”).doubleValue();
simtime_t transmissionDelay = msg->getBitLength() / dataRate;
sendDelayed(msg, transmissionDelay, “linkOut”);
}
- Integrate the Components in a NED File
- State the network topology, linking switches through links.
- Specify the source and destination nodes for the communication session.
Example: Network Topology in NED
network LineSwitchedNetwork {
submodules:
switchA: Switch;
switchB: Switch;
switchC: Switch;
switchD: Switch;
linkAB: Link;
linkBC: Link;
linkCD: Link;
connections allowunconnected:
switchA.lineIn[0] –> linkAB.linkIn;
linkAB.linkOut –> switchB.lineIn[0];
switchB.lineIn[1] –> linkBC.linkIn;
linkBC.linkOut –> switchC.lineIn[0];
switchC.lineIn[1] –> linkCD.linkIn;
linkCD.linkOut –> switchD.lineIn[0];
}
- Run and Analyze the Simulation
- Compile: Make certain that all modules are compiled in OMNeT++.
- Execute: Run the simulation to see how the network executes and tears down connections, and how data is transmitted over the established paths.
- Analyze: Use OMNeT++ tools to evaluate the performance like connection setup time, transmission delay, and throughput.
- Advanced Features
- Dynamic Path Setup: Implement more difficult path configuration mechanisms like using signaling protocols to establish paths dynamically based on network conditions.
- Multiple Connections: Simulate multiple simultaneous connections and assess the performance impact on the network.
- Failure Handling: Execute and examine how the network reacts to link or switch failures as well as redirecting of connections.
Example: Dynamic Path Setup
- Signaling Protocol: Execute a signaling protocol like RSVP to dynamically establish paths based on network conditions.
- Resource Reservation: Simulate resource reservation along the path, making certain that each link has adequate bandwidth for the connection.
Example: Dynamic Path Setup in C++
void Switch::setupPath(int src, int dest) {
// Example logic for dynamic path setup using a signaling protocol
cMessage *setupMsg = new cMessage(“setup”);
setupMsg->addPar(“src”) = src;
setupMsg->addPar(“dest”) = dest;
// Forward the setup message to the next switch
int nextHop = … // Determine next hop
send(setupMsg, “lineIn”, nextHop);
}
In this manual, we gathered the essential details which will help you to implement the Network Line Switching in OMNeT++ with sample snippets. It includes how to generate a topology and how to set up the modules for switch and link with examples. We were intent to provide the future enhancement techniques into this approach.