How to Implement Enhanced Interior Gateway  Protocol in NS2

To implement the Enhanced Interior Gateway Routing Protocol (EIGRP) in NS2, we have to follow a structured approach since NS2 does not have an in-built EIGRP implementation. This protocol is a distance-vector routing protocol that has mechanisms of both link-state and distance-vector protocols, providing fast convergence and scalability. Follow the given demonstration to implement this using ns2:

Step-by-Step Implementation:

  1. Set Up NS2 Environment
  • Make certain to install the ns2 and configure it on your computer.
  1. Understand EIGRP Protocol
  • EIGRP functions by maintaining a routing table, a topology table, and a closest table. It uses the Diffusing Update Algorithm (DUAL) for route computation and offers rapid convergence.
  1. Modify or Create Protocol Files
  • The Execution of EIGRP in NS2 will involve generating new C++ classes and altering available NS2 files. The protocol logic will be written in C++, and you will use OTcl scripts to configure and run simulations.

Steps:

  1. C++ Implementation:
    • Create New C++ Classes:
      • Generate a new class for EIGRP that manages the core mechanisms like neighbor discovery, maintenance of the topology and routing tables, and execution of the DUAL algorithm.
    • Key Components to Implement:
      • Neighbor Discovery and Maintenance: To manage the communication amongst routers and uphold neighbor relationships.
      • Topology Table Management: To keep track of the entire network topology.
      • Routing Table Management: To handle routes and make sure they are the most efficient paths.
      • DUAL Algorithm: To estimate the best paths depend on the lowest-cost metric and ensure loop-free operation.
    • Modify Relevant NS2 Files:
      • Packet Handling: Adjust packet.h to attach a new packet type for EIGRP.
      • Routing Logic: Accomplish the routing logic inside a new EIGRP class (eigrp.h and eigrp.cc).
      • Agent: Alter or generate an agent that manages EIGRP packets (eigrp_agent.h and eigrp_agent.cc).
    • Example Code Structure:

class EIGRP : public Agent {

public:

EIGRP();

int command(int argc, const char*const* argv);

void recv(Packet*, Handler*);

protected:

void process_hello(Packet*);  // Neighbor discovery

void process_update(Packet*);  // Topology updates

void process_query(Packet*);   // Route queries

void process_reply(Packet*);   // Route replies

void run_dual();  // Execute DUAL algorithm

void update_routing_table();  // Update routing table based on DUAL

};

  1. OTcl Script Configuration:
    • In your OTcl scripts, you will set up nodes and configure them to use the EIGRP protocol.
    • Example OTcl Configuration:

# Create nodes

set n0 [$ns node]

set n1 [$ns node]

# Attach EIGRP agent

set eigrp0 [new Agent/EIGRP]

$ns attach-agent $n0 $eigrp0

set eigrp1 [new Agent/EIGRP]

$ns attach-agent $n1 $eigrp1

# Connect nodes

$ns duplex-link $n0 $n1 1Mb 10ms DropTail

# Set up routing

$ns at 0.0 “$eigrp0 start”

$ns at 0.0 “$eigrp1 start”

  1. Testing and Validation
  • After implementing the EIGRP protocol, inspect it by running simulations with various network topologies to make certain that the routing tables are being populated appropriately, routes are being accomplished efficiently, and that the protocol comes together quickly.
  • Validation Criteria:
    • Authenticate neighbor relationships.
    • Check if the topology table is precisely populated.
    • Make certain that the DUAL algorithm is functioning properly.
    • Legalize that the routing tables has the best possible paths.
  1. Debugging
  • Debug your implementation by using the NS2’s tracing potential. Ensure that the EIGRP packets are being properly generated, sent, and received. Trace files will be helpful in understanding how your protocol is acting during simulation.
  1. Simulation
  • Build several simulation scenarios to assess the performance of the EIGRP implementation. You may relate it with other routing protocols in NS2 to verify the efficiency and accuracy of your implementation.

Overall, we have presented the information on how you can implement an Enhanced interior routing protocol (EIGRP) in NS2 by developing dual algorithm to find the best path and so on. You can also envision the simulation and be able to validate mechanisms of it.

Reach out to us for customized services regarding the implementation of Enhanced Interior Gateway Routing Protocol in NS2. Our developers can provide you with results from the distance-vector routing protocol.