Batfish vs Netmiko

Batfish is an open-source tool for analyzing network device configurations and validating network behavior. It works from configuration files, so core analysis does not require direct access to network devices. Teams can inspect deployed configurations and check planned changes before deployment. Checks cover undefined references, MTU and AAA settings, template compliance, sensitive-service reachability and expected traffic paths. Batfish can test whether end-to-end reachability survives any single-link or single-device failure, compare current and planned reachability, assess ACL or firewall changes and evaluate functional equivalence across vendors. Pybatfish provides a Python 3 SDK, and example Jupyter notebooks are available. An all-in-one Docker container bundles Batfish and notebooks. It runs on operating systems supporting Docker. Documented support includes Arista, AWS, Azure, Cisco, Juniper, Palo Alto Networks and SONiC, while Aruba, Dell Force10 and Foundry have limited support.

Netmiko is a free Python library for connecting to network devices and automating command-line tasks. It simplifies SSH connections and also documents supported Telnet device types. The library can collect output from show commands and make configuration changes while handling low-level device state. Its device list spans vendors and separates platforms by regular, limited, and experimental testing status. Regularly tested examples include Arista vEOS, Cisco IOS variants and NX-OS, Juniper Junos, and Linux. Documentation shows how to install with pip, connect to devices, run commands such as “show ip int brief,” and send configuration command sets that enter configuration mode. The project also links to API documentation, a secure copy tutorial, and guidance on using TextFSM. Optional extras support the bulk-encryption CLI and compatibility with Paramiko 4. Netmiko Tools can encrypt sensitive YAML values using Fernet or AES128; the guidance recommends protecting the key and keeping it out of version control. The project uses the MIT license, with bug reports and feature requests directed to GitHub issues.