Pybatfish – Python Client For Batfish (Network Configuration Analysis Tool)

Pybatfish is a Python client for

The Batfish YouTube channel (which you can subscribe to for new content) illustrates many types of checks. These checks span a range of network behaviors and device configuration attributes.

Configuration Compliance

• Flag undefined-but-referenced or defined-but-unreferenced structures (e.g., ACLs, route maps)
• Configuration settings for MTUs, AAA, NTP, logging, etc. match templates
• Devices can only be accessed using SSHv2 and password is not null

Reliability

• End-to-end reachability is not impacted for any flow after any single-link or single-device failure
• Certain services (e.g., DNS) are globally reachable

Security

• Sensitive services can be reached only from specific subnets or devices
• Paths between endpoints are as expected (e.g., traverse a firewall, have at least 2 way ECMP, etc…)

Change Analysis

• End-to-end reachability is identical across the current and a planned configuration
• Planned ACL or firewall changes are provably correct and causes no collateral damage for other traffic
• Two configurations, potentially from different vendors, are functionally equivalent

How do I get started?

If you haven’t already installed Batfish, follow the instructions listed in the batfish github repository to do so.

Install Pybatfish

We highly recommend that you install Pybatfish in a Python 3 virtual environment. Details on how to set one up can be found here. Once your virtual environment is setup and activated, upgrade pip and then install pybatfish.

python3 -m pip install --upgrade pip  python3 -m pip install --upgrade pybatfish  

Now, you are ready to evaluate your own network with Batfish. We encourage you to use Jupyter notebooks as your starting point, but you can use other methods that you are a comfortable with, e.g., an IDE like PyCharm or an interactive Python shell. If you choose to use Jupyter notebooks as your starting point, you need to install Jupyter in your virtual environment. Jupyter documentation can be found here – but the commands below will get you going.

python3 -m pip install jupyter  jupyter notebook  

Our notebooks provide a quick start guide for different use cases. Beyond that, the complete documentation is available on readthedocs.

Pybatfish documentation

Complete documentation of pybatfish APIs is here.