Python Script For Network Engineers – If you are a network or systems engineer, you know the difficulty of backing up the network configuration of multiple network devices in your organization or company. Suppose one day you suddenly find that one of your routers/switches has died without fail. And guess what, you haven’t logged into that device from the initial configuration and you don’t get a chance to look at the device very often and you don’t know much of the configuration inside. Now you are stuck in this situation and confused what to put in the config. So, without any configuration backup, you have no choice.
Ok now we know we have a problem but how can we fix it? As a workaround, there are many network monitoring tools and configuration backup tools available on the web to do all these tasks, but they can be expensive. What if you could come up with your own solution using just a few lines of script? This saves you money and you get a fully customized solution.
Python Script For Network Engineers
In this post, I will help you develop a complete network configuration tool to customize the configuration backup of Cisco devices (Routes, Switches, Wireless Controllers and Tanks) with python script using Netmiko Python module.
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Python is one of the most popular languages for web automation, but having python alone won’t automate tasks easily. Fortunately someone has done a good job of creating libraries or modules that handle many of the details of network automation using Python. So, if you start with automation, you should first get a basic understanding of Python scripting.
Python network automation libraries give you easy communication and management with multiple network devices. There are several Python libraries/modules that can be used to perform network automation tasks such as Paramiko, Netmiko, and NAPALM. But in this post I am using Netmiko Python library for network automation tasks.
Netmiko library is an enhanced version of Paramiko library. It is a multi-vendor library that facilitates an SSH connection to a network device and performs certain operations on the device, such as executing commands.
You can find the library at https://github.com/ktbyers/netmiko and the latest version of the released software can be downloaded here.
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This python script uses a list of device IP addresses in a JSON file. When the script imports the JSON file, it outputs a list of IP addresses and uses a loop to connect to each device and copy the contents of the configuration command that runs.
” and writes the contents of the file to the server running the script. Finally, the script adds a date stamp to the file and places it in a separate directory for each device on the server the script is running on.
You can create a directory anywhere and combine these 2 files in the same directory. In my case, I keep these 2 files inside
The script below is for Cisco routers, but this will also work for Cisco switches. Please make sure to replace the “router” keyword with “key” as appropriate.
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. This will typically be the tftpboot location where backups of your network device configuration are stored. Also, grant the necessary permissions to access tftpboot.
After completing the above TFTP server configuration, you can proceed with the script below to backup your Cisco wireless controller. All this script does is instruct the wireless controller to upload a configuration backup to the TFTP server and, once installed, copy the configuration file to the provided backup location (/root/Network_Device_Backups/WLC).
The vsftpd service will start automatically after the installation is complete. Verify the service mode by executing:
Same here as before, you have to provide TFTP server details to send backup.
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Now we should be able to run this Python device configuration backup script, but we need to make this script executable with the following command.
Finally, it’s time to add a cronjob to run this script schedule at a specific time of day. All you have to do is copy your script to the Daily/Weekly/Monthly folder in the directory below. Or add this script as below method that runs every week at 01:00 AM.
This is about setting up a network device configuration backup for Cisco devices with a Python script using the netmiko python module on a Linux server running Debian/Ubuntu. We hope you can find more information about the Netmiko Python module here. If you have questions or suggestions, you can always leave your comments below. I will do my best to review and answer them.
I’ve completed Kapakdu Jayasena and B.Sc. Specialization (Hons) in IT (Computer Systems and Networking) and currently a Senior Systems Engineer with more than 5 years of relevant experience in various technology areas such as Linux, Networking, Microsoft and Cloud Technologies. You are going as a Network Engineer only to work on your computer. Of course your PC is your most valuable device, but it’s an empty box. With the software on this list, you will turn it into a powerful work tool for any Network Engineer.
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We have created this list by listing the activities you will encounter on a daily basis and the challenges you will encounter from time to time. Next, we ranked the tools according to their importance. We can start with the most important.
PuTTY is the ultimate emulator – we probably all know that already. Allows you to connect to any network device with Telnet, SSH and Serial. In other words, this is your Master Key for your web engineering career. But most network engineers don’t use PuTTY: the market offers many alternatives. For example, SecureCRT or MobaXTerm are two viable options. So why did we choose PuTTY over others?
In fact, many commercial products are more complete than PuTTY in terms of various options. However, we prefer PuTTY because it is simpler and cleaner.
For demanding network engineers, you can still install Super PuTTY. This is a simple program that allows you to organize the PuTTY session you have in a folder. It’s very similar to SecureCRT except it runs a session with PuTTY.
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PuTTY and this is because they haven’t seen its full potential. Imagine solving a problem with a user and sharing a screen. To work out why some channels are missing, you need to try a Telnet or SSH session from your computer. If you have a copy of PuTTY nearby, you can send it to the user. Later,
You can also delete the file when you no longer need it. This gives you a great deal of flexibility that only lightweight software can provide. In a way, it feels like you’re running Linux on Windows.
What world would we live in without Notepad++? As the name suggests, this program is an advanced alternative to Notepad. In fact, it is the best of everything. With this program, your main goal is to write text. The information can be code snippets or configuration commands: it doesn’t matter. Notepad++ will let you do this in a better way.
Among such software, Notepad++ is the absolute king. Do you know your Microsoft Windows Notebook? A white box where you can put text and that’s it. Instead, Notepad++ has many features, here we show the most important ones.
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No network engineer would be worthy of the title without WireShark. This powerful software allows you to capture and analyze packets entering and leaving your device. While this may seem like a simple goal, the consequences are more complex. You never know how many enclosures you’ll need Wireshark: In fact, there’s always a new reason to have it.
If you want to learn more and become a Wireshark master, you can check out our WireShark Crash Course. It will give you all the skills you need to become an expert Packet Sniffer.
Well, the name speaks for itself. This is another leading product in the Open Source industry. If you’re not familiar with it, here are the top reasons to install it today.
Scan for network devices. Lets you know open TCP/UDP ports and open services. You won’t be surprised how many hackers use this software for spying attacks. NMap is a program that allows you to make such discoveries from the command prompt. Anyway, for that. You can easily add ZenMap, a GUI that runs on NMap. Since you won’t be using it often, we recommend installing ZenMap: it will be easier.
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ZenMap and Nmap come with a specific, simple purpose. They allow you to get information about a destination IP address or even an entire subnet. Why do you need them?
If you’re using Linux, you already have it. Actually, Linux comes with Python pre-installed. However, if you are using Windows, you will need to install it. Python is an engine
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