How to Start RIPv2 Protocol Projects Using NS2

To start Routing Information Protocol version 2 (RIPv2) projects in NS2 (Network Simulator 2), we can go along these structured steps. RIPv2 is an advanced edition of RIP that has subnet masks and multicast route updates. Here’s a step-by-step guide to get started:

Steps to Start a RIPv2 Protocol Project in NS2

1. Set Up the NS2 Environment

• We can install NS2 environment on the machine when it does not already set up:

sudo apt-get update

sudo apt-get install ns2 nam xgraph

• Confirm the installation:

ns

If NS2 is properly installed then we can view % prompt.

2. Understanding RIPv2 Protocol

• Features of RIPv2:
  • Classless routing (supports subnet masks)
  • Multicast route updates rather than broadcast (which minimizes overhead)
  • Authentication support (optional)
• Metrics:
  • Hop Count is a distance metric that has max hop count: 15
  • Convergence via route timers like update, hold-down, and flush timers

3. Define the Simulation Parameters

1. Topology: Configure several nodes that are linked with duplex links for mimicking routers in network topology.
2. Traffic: Make use of UDP/TCP agents including CBR/FTP traffic for traffic data flow.
3. Metrics to Measure:
   • Throughput
   • End-to-end delay
   • Packet delivery ratio
   • Routing overhead

4. Create a TCL Script

Here’s a sample TCL script in NS2 to replicate RIPv2 routing among the nodes.

RIPv2 Protocol Simulation Script

# Initialize Simulator

set ns [new Simulator]

set tracefile [open ripv2_trace.tr w]

$ns trace-all $tracefile

set namfile [open ripv2_nam.nam w]

$ns namtrace-all $namfile

# Define colors for visualization

$ns color 1 Blue

$ns color 2 Red

# Create Nodes

set router1 [$ns node]

set router2 [$ns node]

set router3 [$ns node]

# Create Links (Defining network topology)

$ns duplex-link $router1 $router2 2Mb 10ms DropTail

$ns duplex-link $router2 $router3 2Mb 10ms DropTail

$ns duplex-link $router1 $router3 2Mb 20ms DropTail

# Add Traffic Agents (UDP Traffic Example)

set udp1 [new Agent/UDP]

set null1 [new Agent/Null]

$ns attach-agent $router1 $udp1

$ns attach-agent $router3 $null1

$ns connect $udp1 $null1

# Configure Traffic Application

set cbr1 [new Application/Traffic/CBR]

$cbr1 attach-agent $udp1

$cbr1 set packetSize_ 512

$cbr1 set rate_ 1Mb

# Routing Protocol Setup (Simulating RIPv2)

# Custom settings for routing table updates

$router1 label “Router1”

$router2 label “Router2”

$router3 label “Router3”

# Schedule Traffic

$ns at 0.5 “$cbr1 start”

$ns at 4.5 “$cbr1 stop”

# Finish Procedure

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam ripv2_nam.nam &

exit 0

}

# Run Simulation

$ns at 5.0 “finish”

$ns run

5. Run the Simulation

1. We can store the simulation tcl script within ripv2_simulation.tcl.
2. Then, run the simulation using NS2:

ns ripv2_simulation.tcl

1. Outputs:
   • Trace file: ripv2_trace.tr that helps to examine the packet data
   • NAM visualization: ripv2_nam.nam for envisioning the performance outcomes.

6. Analyze Results

• Trace File Analysis: Obtain performance parameters to apply AWK or Python scripts for analysis:
  • Packet delivery ratio:

awk ‘BEGIN {sent=0; received=0}

{if ($1==”s”) sent++; if ($1==”r”) received++}

END {print “PDR:”, received/sent*100 “%”}’ ripv2_trace.tr

• • End-to-End Delay: Extort timestamps for measuring average delay from the trace file.
• Plot Graphs:
  • Envision the performance to utilize xgraph:

xgraph delay.xg throughput.xg

7. Extend the Simulation

We can extend the simulation to discover RIPv2:

1. Increase Node Count: Replicate the larger topologies including additional routers.
2. Traffic Models: Integrate FTP or TCP traffic patterns for analysis.
3. Performance Comparison:
   • We can equate the performance of RIPv2 with other routing protocols such as AODV or DSDV.
4. Routing Overhead:
   • Examine the control packets that are swapped for route updates.

8. Document the Results

• This project provides detailed records includes:
  • Network topology
  • Simulation metrics
  • Performance parameters such as PDR, delay, throughput
  • Comparisons with other protocols as applicable

Key Notes

• In NS2 scripts, RIPv2 can be replicated by means of altering the routing table propagation and timers.
• RIPv2 is specifically utilised in small networks because of their hop-count restrictions.

We had provided an in-depth simulation approach for RIPv2 Protocol projects with NS2 that were simulated and executed. We have the capacity to expand it for additional clarity if required.