In this lesson, you will learn:

  • What is Nornir and NAPALM?
  • The use-case that this integration can be applied to.
  • A code walkthrough of the integration.

You can find the scripts and code for this lesson within the Pytest repo under the directory: 005_integrations/002_nornir.

Integration Overview

The integration we will cover first will be based on Nornir and NAPALM. For those of you who are new to Nornir and NAPALM:


Nornir (from the creator of Napalm, David Barrasso) is a pluggable multi-threaded framework with inventory management to help operate collections of devices. Nornir is 100% Python. Whereas many automation frameworks (such as Ansible) use their own domain-specific language (DSL), Nornir lets you control everything from Python.


NAPALM (Network Automation and Programmability Abstraction Layer with Multi-vendor support) is a Python library that implements a set of functions to interact with different network device operating systems using a unified API.

Key Points

Our integration will therefore be based on the following (diagram below):

  • NAPALM getters will be used to collect data from our devices and return the data in a normalized/vendor-agnostic format.
  • Nornir will be used to run NAPALM against our devices using a static-based inventory.
  • Multi-layer parametrization will be used within Pytest to dynamically generate the required tests.
  • We will perform tests to validate the CPU and memory usage, and also the interface errors across a multi-vendor (Cisco, Juniper and Arista) network.
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