Network Configuration Automation

What is Network Configuration Automation?

Network Configuration Automation involves creating templates and scripts that define how a network device should be configured and then through the use of an automation tool, pushing that rendered configuration to the device.

Network configuration automation is the practice of creating, managing, validating, and enforcing network device configurations through software rather than manual CLI changes. It enables consistent, repeatable, and auditable configuration across routers, switches, firewalls, and wireless infrastructure.

By treating network configurations as code, teams reduce human error, improve change velocity, and maintain compliance across large or distributed environments.

Also involved in network configuration automation is the backup of configurations and compliance checking and remediation of config drift.

In this post I will discuss how to setup network configuration automation using Ansible, render a sample config and then push it to a device.

Network Configuration Automation Tools

Common network configuration automation tools include:

• Ansible
• Nornir
• Netbox
• Batfish
• Nautobot

Popular Network Configuration Automation Tools

Common network configuration automation tools include:

• Ansible Network Automation
• Terraform (network provisioning and state)
• Nornir
• SaltStack
• Cisco NSO
• Batfish (configuration validation)
• NetBox (source of truth integration)

These tools integrate with:

• Git repositories
• CI/CD pipelines
• ITSM systems
• Monitoring and telemetry platforms

Open Source Network Configuration Automation

Network configuration automation open source tools are widely adopted due to flexibility, transparency, and community support.

Common Open Source Tools:

• Ansible – agentless, declarative automation using YAML
• Nornir – Python‑native automation framework
• Netmiko – multi-vendor SSH automation
• NAPALM – abstraction for network OS interactions
• NetBox – infrastructure source of truth
• Batfish – configuration analysis and verification

Open‑source tooling enables:

• Vendor neutrality
• Custom workflows
• Strong integration with GitOps practices

Network Configuration Automation Software

Network Configuration Automation Examples

Network Device Configuration Automation

Network device configuration automation focuses on automating the complete lifecycle of device configuration:

• Initial provisioning (Day 0)
• Configuration changes (Day 1)
• Ongoing validation and drift control (Day 2)

Typical devices include:

• Routers (Cisco IOS/IOS‑XE/XR, Juniper Junos, Arista EOS)
• Switches
• Firewalls (Palo Alto, Fortinet)
• Load balancers
• Wireless controllers

Automation applies vendor‑agnostic logic using APIs, NETCONF/RESTCONF, SSH, or model‑driven interfaces (YANG

Why Configuration Automation Matters for Networks

Manual network configuration leads to:

• Configuration drift
• Inconsistent environments
• Increased outage risk
• Limited auditability

Configuration automation enables:

• Predictable change management
• Reliable rollbacks
• Version‑controlled configurations
• Improved collaboration between NetOps, SecOps, and DevOps

---

Typical Use Cases

• Standardised switch and router builds
• Firewall policy deployment at scale
• Multi‑vendor configuration management
• Zero‑touch provisioning (ZTP)
• Security compliance enforcement
• Network change automation with approvals

---

Best Practices for Network Configuration Automation

• Use Git as the source of truth
• Separate configuration logic from device variables
• Implement pre‑change validation
• Enforce peer review and approvals
• Monitor for drift continuously
• Log and audit all changes