PyATS VLAN Trunk Interface Test

Overview

This repository contains a PyATS test script to add a VLAN to a trunk interface on a Cisco switch and verify the configuration. The script is designed to automate the process of VLAN configuration on network devices, ensuring that the VLAN is correctly added and operational.

Integrate fuzzing into your PyATS script for adding a VLAN to a trunk interface

Fuzz testing (or fuzzing) is a software testing technique that involves providing invalid, unexpected, or random data as inputs to a computer program. Fuzzing can help find vulnerabilities and bugs that might not be discovered through regular testing. To integrate fuzzing into your PyATS script for adding a VLAN to a trunk interface, you can use a Python fuzzing library such as Atheris or python-afl.

Prerequisites

Before running the script, ensure you have the following:

• Python 3.6+
• Cisco Test Automation Solution (PyATS) and Genie libraries
• Access to the network devices (Cisco switch) with appropriate credentials
• SSH access to the switch

Installation

1. Clone the repository:

   git clone <repository_url>
   cd <repository_directory>

2. Create and activate a virtual environment (optional but recommended):

   python3 -m venv venv
   source venv/bin/activate

3. Install the required packages:

   pip install pyats[full]
   pip install genie

Configuration

1. Create a testbed file: Define the network devices in a YAML file (e.g., testbed.yaml). Here is an example configuration:

   testbed:
     name: example_testbed
     devices:
       switch:
         os: ios
         type: switch
         connections:
           cli:
             protocol: ssh
             ip: 192.168.1.1
         credentials:
           default:
             username: your_username
             password: your_password

   Replace the placeholders with your actual network details (IP addresses, usernames, passwords).

2. Update the test script: If necessary, update the VLAN ID and the trunk interface name in the script (pyats_addvlan.py):

   vlan_id = 10
   interface_name = 'GigabitEthernet0/1'

Usage

To run the test script, execute the following command:

python pyats_addvlan.py --testbed testbed.yaml

Script Details

This script will:

1. Connect to the network device defined in the testbed.
2. Add the specified VLAN to the trunk interface.
3. Verify that the VLAN has been successfully added.
4. Disconnect from the device.

Script Phases

• Setup Phase: Connects to the device using the details provided in the testbed file.
• Test Phase: Adds the specified VLAN to the trunk interface and verifies the configuration.
• Cleanup Phase: Disconnects from the device.

Explanation of the Fuzzing Integration

• FuzzedDataProvider: This class is used to generate fuzzed inputs for the VLAN ID and the interface name.
• TestOneInput Function: This function is called with fuzzed data, which it then uses to generate VLAN IDs and interface names. It performs the setup, configuration, verification, and cleanup steps using these fuzzed inputs.
• Main Function: This function sets up and starts the fuzzing process using Atheris.

Considerations

• Valid Ranges and Inputs: The ConsumeIntInRange method ensures that the fuzzed VLAN ID falls within the valid range (1-4094). The interface name is fuzzed to be a random Unicode string.
• Exception Handling: The script includes exception handling to catch and report errors that occur during configuration and verification.
• Resource Management: Ensure that the network devices and test environments are properly managed and that resources are cleaned up after tests.

Notes

• Ensure you have the necessary permissions to modify the VLAN configurations on the network device.
• Test the script in a controlled environment before deploying it to production.

License

This project is licensed under the MIT License.

Output