How to Implement intra domain protocol in OMNeT++
To implement an intra-domain routing protocol in OMNeT++ encompasses numerous stages. Mostly used intra-domain protocol is the Open Shortest Path First (OSPF) protocol.
Now we give a complete note to implement OSPF in OMNeT++ by using the INET framework.
Step-by-Step Implementations:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: From the OMNeT++ we download and install the modest version of OMNeT+.
- Install INET Framework: To install and download the INET framework from the INET repository.
Step 2: Understand OSPF Protocol
For intra-domain routing by using OSPF is a link-state routing protocol. Important thoughts contain:
- Link-State Advertisements (LSAs): Castoff to present the state of links.
- Hello Protocol: For neighbour discovery and upholding neighbour relationships is used this protocol.
- Shortest Path First (SPF) Algorithm: It is used to estimate the shortest path tree to each path.
Step 3: Create the OSPF Protocol Module
Define the Module in .ned File
To build a .ned file for the OSPF protocol module.
simple OSPF
{
parameters:
double helloInterval @unit(s) = default(10s);
double lsaInterval @unit(s) = default(30s);
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Implement the Module in C++
Form the corresponding .cc and .h files.
OSPF.h
#ifndef __OSPF_H_
#define __OSPF_H_
#include <omnetpp.h>
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include “inet/networklayer/ipv4/IPv4Datagram.h”
#include <map>
using namespace omnetpp;
using namespace inet;
class OSPF : public cSimpleModule
{
private:
double helloInterval;
double lsaInterval;
IRoutingTable *routingTable;
cMessage *helloMsg;
cMessage *lsaMsg;
std::map<L3Address, int> neighbors; // Neighbors table
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void sendHello();
void processHello(cMessage *msg);
void sendLSA();
void processLSA(cMessage *msg);
public:
OSPF();
virtual ~OSPF();
};
#endif
OSPF.cc
#include “OSPF.h”
Define_Module(OSPF);
OSPF::OSPF()
{
helloMsg = nullptr;
lsaMsg = nullptr;
}
OSPF::~OSPF()
{
cancelAndDelete(helloMsg);
cancelAndDelete(lsaMsg);
}
void OSPF::initialize()
{
helloInterval = par(“helloInterval”);
lsaInterval = par(“lsaInterval”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
helloMsg = new cMessage(“sendHello”);
lsaMsg = new cMessage(“sendLSA”);
scheduleAt(simTime() + helloInterval, helloMsg);
scheduleAt(simTime() + lsaInterval, lsaMsg);
}
void OSPF::handleMessage(cMessage *msg)
{
if (msg == helloMsg)
{
sendHello();
scheduleAt(simTime() + helloInterval, helloMsg);
}
else if (msg == lsaMsg)
{
sendLSA();
scheduleAt(simTime() + lsaInterval, lsaMsg);
}
else if (strcmp(msg->getName(), “Hello”) == 0)
{
processHello(msg);
}
else if (strcmp(msg->getName(), “LSA”) == 0)
{
processLSA(msg);
}
else
{
// Handle other messages
}
}
void OSPF::sendHello()
{
cMessage *hello = new cMessage(“Hello”);
send(hello, “toNetworkLayer”);
}
void OSPF::processHello(cMessage *msg)
{
// Implement processing of Hello message
delete msg;
}
void OSPF::sendLSA()
{
cMessage *lsa = new cMessage(“LSA”);
// Implement LSA details and send
send(lsa, “toNetworkLayer”);
}
void OSPF::processLSA(cMessage *msg)
{
// Implement processing of LSA message
delete msg;
}
Step 4: Integrate with Simulation Model
Add the OSPF module into a network simulation model.
Network Configuration .ned File
network OSPFNetwork
{
submodules:
router1: StandardHost {
parameters:
@display(“p=100,100”);
routingTableModule = “^.routingTable”;
}
router2: StandardHost {
parameters:
@display(“p=300,100”);
routingTableModule = “^.routingTable”;
}
// Add more routers as needed
connections:
router1.pppg++ <–> { @display(“m=100,100”); } <–> router2.pppg++;
}
omnetpp.ini Configuration
[General]
network = OSPFNetwork
*.router*.pppg[*].queue.typename = “DropTailQueue”
*.router*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
*.router*.networkLayer.networkProtocol.typename = “IPv4NetworkLayer”
*.router*.transportLayer.tcp.typename = “Tcp”
*.router*.transportLayer.udp.typename = “Udp”
*.router*.application[*].typename = “UdpBasicApp”
*.router*.application[*].destAddresses = “router1” // Set destination as needed
*.router*.application[*].destPort = 2000
*.router*.application[*].startTime = uniform(0s, 10s)
*.router*.application[*].sendInterval = uniform(1s, 2s)
*.router*.application[*].packetLength = 512B
*.router*.app[0].typename = “OSPF”
Step 5: Test and Debug
- Run Simulations: Complete simulations to test the conduct of the OSPF module in the different network orders.
- Analyze Results: Act of the execution and to validate the exactness.
- Debugging: To troubleshoot the any problems by using the OMNeT++’s debugging tools.
Through this script, we show the way is how to execute the Intra Domain Protocol in OMNeT++.We have an idea to provide more facts in OMNeT++ tool based on your project so get our developers guidance for your simulation process.