How to Implement ccna protocols in OMNeT++
To implement the protocols which is covered in the Cisco Certified Network Associate (CCNA) certification like OSPF, EIGRP, and RIP, in OMNeT++ has numerous steps. Let’s see the detailed guide on how to implement a common CCNA protocol, such as the Open Shortest Path First (OSPF) protocol, in OMNeT++:
Step-by-Step Implementation:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: Make sure to install the latest version of OMNeT++.
- Install INET Framework: Install the INET framework from the INET repository.
Step 2: Understand OSPF Protocol
OSPF is a link-state routing protocol used for intra-domain routing. Key concepts include:
- Link-State Advertisements (LSAs): Used to advertise the state of links.
- Hello Protocol: Used for neighbor discovery and maintaining neighbor relationships.
- Shortest Path First (SPF) Algorithm: Used to measure the shortest path tree for every route.
Step 3: Create the OSPF Protocol Module
Define the Module in .ned File
Generate 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++
Create 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
Integrate the OSPF module inside the 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
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: Implement the simulations to examine the behavior of OSPF module in different network conditions.
- Analyze Results: Verify the correctness and performance of the implementation.
- Debugging: Use OMNeT++’s debugging tools to troubleshoot any issues.
Finally, this script will completely walk you through every details regarding the implementation of CCNA protocols and how to use it with INET frameworks in the OMNeT++. Based on your requirements, we will offer you the additional information of the above protocols. Get Implementation of ccna protocols in OMNeT++ for your projects from omnet-manual.com developers.