Manual network device configuration is slow, error-prone, and does not scale. Network automation using Python and specialized libraries enables engineers to manage thousands of devices programmatically, ensuring consistency, enabling version control, and dramatically reducing the time required for network changes.
Python Libraries for Network Automation
Netmiko provides a simplified SSH interface for interacting with network devices from multiple vendors. It handles the complexity of different command prompts, pagination, and output parsing, enabling engineers to send commands and retrieve configurations from routers, switches, and firewalls with just a few lines of Python code.
NAPALM takes network automation further by providing a vendor-agnostic API for configuration management. Its get methods retrieve structured data about device state, while configuration methods support declarative management where the engineer specifies the desired configuration and NAPALM calculates and applies the necessary changes.
For large-scale network automation, Nornir provides a multi-threaded framework that executes tasks across hundreds of devices in parallel. Combined with a source of truth like NetBox for inventory management and intended state, organizations can build end-to-end automation workflows that validate changes before deployment and verify compliance continuously.