In today’s fast-paced IT landscape, network automation tools are essential for streamlining complex tasks, reducing human errors, and increasing efficiency in network management. As networks grow in complexity, manual configurations become impractical, making automation a necessity rather than a luxury for network engineers. Selecting the right tools can make a significant difference in optimizing performance, ensuring security, and simplifying operations. In this article, we’ll explore the best network automation tools for network engineers, focusing on their capabilities, use cases, and how they can help automate enterprise networks.
NetBox serves as a critical foundation for network automation by providing a reliable source-of-truth for network infrastructure data. It excels at IP address management (IPAM), device inventory tracking, and topology documentation.
How it works: NetBox maintains a central database of all network devices, IP addresses, racks, and connections. Through its RESTful API, other automation tools can query and update this data, ensuring all automated processes work with accurate information.
Example: A network engineer can use NetBox to document a new subnet allocation, then use the API to extract this information for automated VLAN provisioning:
import requests
# Query NetBox API for available prefix information
response = requests.get(
'https://netbox.example.com/api/ipam/prefixes/',
headers={'Authorization': 'Token abc123'},
params={'site': 'dc-east'}
)
available_prefixes = response.json()['results']Ansible remains one of the most popular open-source network automation tools, known for its agentless architecture and ease of use. Network engineers use Ansible for configuration management, orchestration, and automation of network devices across multiple vendors.
How it works: Ansible uses YAML-based playbooks to define automation tasks and leverages SSH or API connections to configure network devices without requiring agents installed on the devices themselves.
Example: Configuring VLANs across multiple switches:
---
- name: Configure VLANs on network devices
hosts: switches
gather_facts: no
tasks:
- name: Create VLAN 100
cisco.ios.ios_vlans:
vlan_id: 100
name: "User-VLAN"
state: present
- name: Configure VLAN interface
cisco.ios.ios_l2_interface:
name: "GigabitEthernet0/1"
mode: access
access_vlan: 100Ansible Network Automation Documentation
Nornir is a powerful Python automation framework designed specifically for networking. It provides superior flexibility and speed compared to other tools, making it ideal for complex automation tasks.
How it works: Nornir leverages Python’s programming capabilities while handling device connections and task execution in parallel. Unlike Ansible, Nornir is a Python library that you import into your scripts, giving you full programming flexibility.
Example: Gathering interface information from multiple devices:
from nornir import InitNornir
from nornir_napalm.plugins.tasks import napalm_get
from nornir_utils.plugins.functions import print_result
# Initialize Nornir with inventory
nr = InitNornir(config_file="config.yaml")
# Run task to get interface information from all devices
result = nr.run(
task=napalm_get,
getters=["interfaces"]
)
# Print results
print_result(result)Napalm provides a unified API to interact with different network device operating systems, making multi-vendor automation more straightforward.
How it works: Napalm abstracts the differences between network operating systems, allowing engineers to use consistent methods regardless of whether they’re working with Cisco IOS, Juniper JunOS, or Arista EOS.
Example: Configuring a banner on different vendor devices:
from napalm import get_network_driver
# Configure devices from different vendors using the same code
for device_os, device_ip in [("ios", "192.168.1.1"), ("junos", "192.168.1.2")]:
driver = get_network_driver(device_os)
device = driver(hostname=device_ip, username="admin", password="password")
device.open()
device.load_merge_candidate(config="banner motd 'Authorized access only'")
device.commit_config()
device.close()While traditionally associated with cloud infrastructure, Terraform is increasingly used for network infrastructure as code, particularly in environments that blend traditional networking with cloud resources.
How it works: Terraform uses declarative configuration files to define the desired state of infrastructure, including network components. Its providers support various networking platforms.
Example: Provisioning network resources in AWS:
resource "aws_vpc" "main" {
cidr_block = "10.0.0.0/16"
tags = {
Name = "Production VPC"
}
}
resource "aws_subnet" "public" {
vpc_id = aws_vpc.main.id
cidr_block = "10.0.1.0/24"
tags = {
Name = "Public Subnet"
}
}
resource "aws_security_group" "allow_web" {
name = "allow_web_traffic"
description = "Allow web inbound traffic"
vpc_id = aws_vpc.main.id
ingress {
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
}Terraform Networking Documentation
Many enterprises have legacy systems that are not designed to work with modern automation frameworks. These legacy devices often lack API support, have proprietary interfaces, or run outdated operating systems that don’t support standard automation protocols. This creates integration silos and requires maintaining multiple automation approaches simultaneously.
Solution:
Traditional network engineers may not have expertise in automation scripting and programming concepts. Many teams face resistance to adoption due to unfamiliarity with software development practices, version control systems, and programming languages needed for effective automation.
Solution:
As automation scales, maintaining consistent configurations becomes challenging. Configuration drift, where devices gradually develop inconsistencies due to manual changes or failed automation attempts, can undermine reliability and security. Without proper governance, automated systems can actually increase complexity rather than reduce it.
Solution:
Selecting the right combination of network automation tools requires a strategic approach that considers your entire automation lifecycle. Start with NetBox as your source of truth to ensure all automation efforts are based on accurate data. Then, depending on your team’s skills and requirements, implement Ansible for broad, declarative automation or Nornir for more programmatic control.
The most successful network automation implementations typically use multiple tools in concert:
Begin your automation journey with small, high-value tasks that provide quick wins. As your team gains confidence and expertise, gradually expand your automation footprint. Remember that successful network automation is as much about people and processes as it is about tools—invest in training and create clear workflows for making changes.
By building a comprehensive automation strategy that combines the right tools with proper processes, network engineers can transform their operations from reactive to proactive, ultimately delivering more reliable and agile network services to their organizations.
Are you ready to automate your network? Start by evaluating your existing infrastructure and business needs, choose the tools that best align with your goals, and begin building your network automation ecosystem today.
