1+1, 1:1 & Shared Protection

Reference implementations of three routing-and-spectrum-allocation (RSA) protection schemes for elastic optical networks, plus helper scripts for proactive path monitoring and topology visualization.

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Features

• Protection Schemes

  • 1+1 Protection: Primary and backup paths carry traffic simultaneously; immediate switchover on failure.
  • 1:1 Protection: Backup path reserved; traffic switches over only when primary fails.
  • Shared Protection: Multiple demands share a common backup resource.

• Core Functions (function.py)

  • Load a JSON‐formatted topology (NetworkX).
  • Generate random traffic demands.
  • Compute up to k edge‐disjoint paths.
  • First-Fit RSA for each protection scheme.
  • Spectrum management (clear/occupy/release slots).
  • Transponder counting and savings calculation.

• Proactive Monitoring (run_function.py)

  • Periodically test primary path Packet Loss Ratio (PLR).
  • Automatic switchover to backup if PLR exceeds a threshold.

• Topology Visualization (topology_show.py)

  • Draws a directed graph from IT_21.json using NetworkX + Matplotlib.

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Prerequisites

• Python 3.7+
• NetworkX (2.x)
• Matplotlib (for topology visualization)

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Installation

git clone https://github.com/LonghairXu/1-1_protection-1_to_1_protection-and-shared_protection.git
cd 1-1_protection-1_to_1_protection-and-shared_protection
python3 -m venv venv
source venv/bin/activate         # (Windows: venv\Scripts\activate.bat)
pip install networkx matplotlib