Containerlab vs NAPALM

Containerlab is a command-line tool for orchestrating container-based networking labs. Users describe nodes, links and lab settings in topology files, then use lifecycle commands to deploy, destroy, save, inspect or graph a lab. Supported nodes include containerized and virtual-machine network operating systems from Nokia, Cisco, Juniper, Arista and other vendors and projects. The project lists platforms such as Nokia SR Linux and SR OS, Cisco XRd and Nexus 9000v, Juniper cRPD and vMX, Arista, SONiC, Cumulus VX, VyOS, FRR, VPP, FreeBSD, OpenBSD, OpenWRT, Linux containers and generic VMs. It can launch VM routers through vrnetlab or boxen, and Clabernetes can run Containerlab-style topologies on Kubernetes. Optional interfaces include a VS Code extension, desktop app and web app; desktop and web connect to a reachable clab-api-server on a Linux host. Its single binary and topology definitions can start labs in CI systems such as GitLab CI and GitHub Actions. Containerlab is free and open source. Documented prerequisites include a Linux server or VM, Docker and sudo privileges for some operations.

NAPALM is a free Python library for automating network devices from multiple vendors through a shared API. It connects to devices, changes configurations, and retrieves operational data. Its core drivers cover Arista EOS, Cisco IOS, Cisco IOS-XR, Cisco NX-OS, and Juniper JunOS, with additional community drivers. Configuration methods include replace, merge, compare, commit-confirm, and rollback, although availability depends on the platform. Getters can return device facts, configurations, interface information, BGP neighbors, and environment data, with coverage varying by driver. For validation, NAPALM can compare live device state against YAML expectations and create a compliance report. The project identifies integrations with Ansible, SaltStack, and StackStorm. Installation uses `pip install napalm`, which includes the currently available core drivers. Version 5.1.0 and later supports Python 3.9 and later. It is self-hosted, licensed under Apache-2.0, and free at free. Documentation advises checking platform-specific caveats before use.