To simulate a Path Vector Routing project using OMNeT++, we need to follow these steps:
Steps to Simulate Path Vector Routing Projects in OMNeT++
- Set up OMNeT++ Environment
- Install OMNeT++ on the system. We must download OMNeT++.
- Configure INET framework if simulation needs network-related models like routers, IP networks, and routing protocols. INET can be installed via OMNeT++’s package management or physically downloaded and set up.
- Implement the Path Vector Protocol
Path vector routing performs by maintaining path information in routing tables, usually utilized in Border Gateway Protocol (BGP). We will need to either:
- Apply the path vector routing protocol from scratch or
- Prolong an existing routing protocol (such as BGP) to replicate the behaviour of path vector routing.
Here’s a high-level view of implementing the routing logic:
- Routing Tables: Nodes sustains a routing table with the path vector (list of routers) for each destination.
- Route Propagation: Each node distributes its path vector with neighbouring nodes.
- Routing Decisions: A node chooses routes according to path information and prefers shorter paths or policy-based preferences.
- Simulation Design
- Create a Simple Network Topology: Describe a network with multiple routers and paths among them. We can generate this topology using NED files in OMNeT++.
- Define Path Vector Routing Logic: Apply the logic to interchange routing tables and handle path vectors. We can generate routing logic in the C++ simulation models.
- Extend INET’s Routing Protocol: INET deliver simple routing protocols like OSPF and BGP, and we can expand them to execute path vector logic. Look at the BGP implementation by way of a starting point, if necessary.
- Model Network Topology
- Utilize the NED (Network Description) language in OMNeT++ to generate network topology. For instance, describe multiple routers associated to each other, simulating an AS (Autonomous System) for BGP.
- Example NED file for simple routers:
simple Router
{
parameters:
@display(“i=block/routing”);
gates:
input in[];
output out[];
}
network PathVectorNetwork
{
submodules:
router[5]: Router;
connections:
router[0].out++ –> router[1].in++;
router[1].out++ –> router[0].in++;
router[1].out++ –> router[2].in++;
// Add more connections
}
- Simulate the Routing Behaviours
- Apply or adjust a C++ class for the path vector routing protocol. This should manage routing table updates and route advertisements among routers.
- Example skeleton of a routing class:
class PathVectorRouting : public cSimpleModule
{
private:
std::map<int, std::vector<int>> routingTable;
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void updateRoutingTable();
void sendRouteAdvertisement();
};
- Run the Simulation
- After compose the routing logic and describing network topology, build the project in OMNeT++ and execute the simulation.
- Utilize OMNeT++’s built-in tools to evaluate packet flow, routing decisions, and parameters like convergence time.
- Analyse Results
- Validate the simulation logs and output data to measure on how path vector routing protocol performs.
- We can envision the routing decisions in the OMNeT++ simulation environment.
- Extend the Project
Depending on project requirements, we need to:
- We can add more complex network topologies.
- Replicate larger networks to monitor scalability.
- It contains network failures to validate routing robustness.
In this process, we had uncovered the details about Path Vector Routing project simulation procedures and how to evaluate the Path Vector Routing project outcomes across the OMNeT++ tool. Further details regarding the Path Vector Routing project will be provided in upcoming manuals.
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