Python automation scripts for networking are used to help network engineers manage multiple devices, collect data, and push configurations. It reduces the repetitive manual work instead of logging into every router, switch, firewalls.
Python is one of the easiest programming languages for network automation. It has simple syntax and strong libraries and good support for working with different devices. This guide will discuss working Python automation scripts for networking with examples.
Before getting into more details, let us first understand what network automation is.
What Is Network Automation?
Network automation means using tools, scripts, and other platforms to perform networking tasks automatically. These tasks can include device configuration, monitoring and troubleshooting, and reporting along with compliance checks.
In a traditional network, engineers log into each device and run commands manually. For instance, they may use SSH to access a switch and type commands like “show ip interface” or show running-config.
The goal is not to remove network engineers. The goal is to remove repetitive work so engineers can focus on design and security.
Why Is Python Used in Network Automation?
Python is popular in network automation because it is simple and practical. Many network engineers start with Python because it feels easier than traditional programming languages.
Python can connect to routers, switches, firewalls, and controllers. It can read data from files. It can process command output. It can work with APIs. It can also generate reports.
Another reason is library support. Python has useful libraries such as Netmiko, Paramiko, NAPALM, Requests, and TextFSM. These libraries make automation easier.
For example, Netmiko helps connect to network devices through SSH. Requests helps work with REST APIs. NAPALM gives a common way to work with different vendor devices.
This makes Python flexible for
- Cisco
- Juniper
- Arista
- Fortinet
- Palo Alto, and many other network environments.
Python Script to Check Device Reachability
It is one of the simplest automation use cases to check whether network devices are reachable or not.
Example:
import os
devices = [“192.168.1.1”, “192.168.1.2”, “192.168.1.3”]
for device in devices:
response = os.system(f”ping -c 2 {device}”)
if response == 0:
print(f”{device} is reachable”)
else:
print(f”{device} is not reachable”)
This script is simple, but useful. It checks multiple devices one by one. In a real network, the device list can be stored in a text file or CSV file.
This kind of script helps during health checks, migration activity, and outage troubleshooting.
Python Script to Take Network Device Backup
Configuration backup is one of the most common Python automation tasks in networking. Network teams must keep backups of router and switch configurations. If a device fails or configuration is changed by mistake, backup helps restore the network.
Netmiko is commonly used for this task.
Example:
from netmiko import ConnectHandler
device = {
“device_type”: “cisco_ios”,
“host”: “192.168.1.1”,
“username”: “admin”,
“password”: “password”
}
connection = ConnectHandler(**device)
output = connection.send_command(“show running-config”)
with open(“router_backup.txt”, “w”) as file:
file.write(output)
connection.disconnect()
This script connects to a Cisco device, runs the “show running-config” command, and saves the output in a text file.
Python Script to Run Commands on Multiple Devices
Network engineers often need to run the same command on many devices.
For Example:
Python can make this task much faster.
from netmiko import ConnectHandler
devices = [
{
“device_type”: “cisco_ios”,
“host”: “192.168.1.1”,
“username”: “admin”,
“password”: “password”
},
{
“device_type”: “cisco_ios”,
“host”: “192.168.1.2”,
“username”: “admin”,
“password”: “password”
}
]
for device in devices:
connection = ConnectHandler(**device)
output = connection.send_command(“show ip interface brief”)
print(f”\nOutput from {device[‘host’]}”)
print(output)
connection.disconnect()
This script loops through multiple devices and runs the same command on each one.
This script loops through multiple devices and runs the same command on each device, which makes it useful for troubleshooting and routine checks.
Python Script to Push Configuration Changes
Python can also be used to push configuration changes. For example, you can create a VLAN on a switch.
from netmiko import ConnectHandler
switch = {
“device_type”: “cisco_ios”,
“host”: “192.168.1.10”,
“username”: “admin”,
“password”: “password”
}
config_commands = [
“vlan 20”,
“name HR_DEPARTMENT”
]
connection = ConnectHandler(**switch)
output = connection.send_config_set(config_commands)
print(output)
connection.disconnect()
This script connects to the switch and creates VLAN 20 with the name HR_DEPARTMENT.
However, configuration scripts should be used carefully. A wrong command can affect production traffic. Always test scripts in a lab first. Use backups before making changes. Add proper validation before and after configuration.
Python Script for API-Based Network Automation
Modern networks are not limited to CLI. Many tools and controllers support APIs.
Examples
- Cisco DNA Center
- Cisco Meraki
- Fortinet
- Palo Alto
- VMware NSX
- Cloud networking platforms
APIs allow Python to interact with systems using structured data.
Example:
import requests
url = “https://api.example.com/devices”
headers = {
“Authorization”: “Bearer YOUR_API_TOKEN”,
“Content-Type”: “application/json”
}
response = requests.get(url, headers=headers)
print(response.json())
Useful Python Libraries for Networking
List of useful Python libraries for network automation are:
- Netmiko
- Paramiko
- NAPALM
- Requests
- TextFSM
- PyYAML
- Pandas
You do not need to learn all libraries at once. Start with Netmiko and Requests. These two are enough for many beginner-level automation tasks.
Python Automation vs Manual Network Management
Manual network management gives direct control, but it becomes slow at scale. If you have five devices, manual work may be fine.
Python automation brings speed, consistency, and repeatability.
For example, if you need to check OSPF neighbor status on 100 routers. Python can collect the output from all routers and show the result in one place.
Manual work also depends on the engineer’s attention. Automation follows the same logic every time. This reduces human error.
Mistakes to avoid while using scripts
Many engineers make the mistake of copying scripts without understanding them. This is risky. You should know what each line is used for.
Another mistake is using production devices too early. Always use a lab or test environment first.
Some engineers ignore error handling. This makes scripts fail when one device is unreachable. A good script should continue working and report the failed device.
Another mistake is poor credential handling. Never share scripts with passwords inside them.
Also, do not automate bad processes. If a manual process is unclear, automation will only make the confusion faster. First, define the process. Then automate it.
Frequently Asked Questions
Q1. What are Python automation scripts for networking?
They are scripts that automate network tasks like backups, configuration checks, device monitoring, troubleshooting, and command execution across multiple devices. It is a script that automates network tasks like taking backups, configure checks, monitoring devices and executing commands.
Q2. Why is Python useful for network automation?
Python is easy to learn, supports networking libraries, works with SSH and APIs, and helps engineers reduce repetitive manual work.
Q3. Which Python libraries are used in networking?
Common libraries include Netmiko, Paramiko, NAPALM, Requests, TextFSM, PyYAML, and Pandas for device access, APIs, parsing, and reporting network data.
Q4. Can beginners learn Python network automation?
Yes, beginners can start with Python basics, then practice device login, show commands, backups, and simple configuration tasks in labs.
Conclusion
Python automation scripts for networking help engineers save time, reduce manual errors, and manage devices more efficiently. From simple ping checks to configuration backups and command execution, API calls, and reports, Python can easily automate daily tasks.
For beginners, the best approach is to start small. Learn basic Python. Practice with one device. Use Netmiko for SSH automation. Use Requests for API automation. Build scripts slowly and test them carefully.
