Reliable Data Transfer Protocols: P4 & Selective Repeat

This repository contains the implementation and analysis of reliable data transfer protocols as part of a networking project. The focus is on P4 (Programming Protocol-Independent Packet Processors) and Selective Repeat ARQ (Automatic Repeat reQuest).

The project explores protocol behavior, error handling, and performance under different simulated network conditions.

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📂 Project Structure

code texts/

│── p4 code.txt # P4 implementation of protocol logic

│── sr code.txt # Selective Repeat protocol implementation

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🚀 Features

• P4-based implementation for programmable data-plane packet processing.
• Selective Repeat ARQ protocol written in structured code format.
• Analysis of packet retransmission, error handling, and throughput.

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⚙️ Requirements

• P4 Compiler / Behavioral Model (bmv2)
• Python 3.x (if running simulations)
• Networking tools such as:
  • mininet
  • Wireshark (for packet inspection)

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🛠️ Usage

1. Running the P4 Code

Example workflow with P4 behavioral model

• p4c --target bmv2 --arch v1model p4_code.p4 -o build/
• simple_switch --log-console build/p4_code.json

2. Running the Selective Repeat Simulation If the sr code.txt is intended for simulation in C/Python:

Convert file extension first (if needed)

mv "sr code.txt" sr_protocol.py

Run simulation

python3 sr_protocol.py

📊 Expected Output

• Packet transmission and retransmission logs.
• Performance evaluation of P4 vs SR ARQ.
• Insights into error control efficiency and protocol behavior.