Book Image

Practical Network Automation

By : Abhishek Ratan
Book Image

Practical Network Automation

By: Abhishek Ratan

Overview of this book

Network automation is the use of IT controls to supervise and carry out every-day network management functions. It plays a key role in network virtualization technologies and network functions. The book starts by providing an introduction to network automation, SDN, and its applications, which include integrating DevOps tools to automate the network efficiently. It then guides you through different network automation tasks and covers various data digging and reporting methodologies such as IPv6 migration, DC relocations, and interface parsing, all the while retaining security and improving data center robustness. The book then moves on to the use of Python and the management of SSH keys for machine-to-machine (M2M) communication, all followed by practical use cases. The book also covers the importance of Ansible for network automation including best practices in automation, ways to test automated networks using different tools, and other important techniques. By the end of the book, you will be well acquainted with the various aspects of network automation.
Table of Contents (14 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Using Netmiko for SSH and network device interaction


Netmiko (https://github.com/ktbyers/netmiko) is a library in Python that is used extensively an interaction with network devices. This is a multi-vendor library with support for Cisco IOS, NXOS, firewalls, and many other devices. The underlying library of this is Paramiko, which is again used extensively for SSH into various devices.

Netmiko extends the Paramiko ability of SSH to add enhancements, such as going into configuration mode in network routers, sending commands, receiving output based upon the commands, adding enhancements to wait for certain commands to finish executing, and also taking care of yes/no prompts during command execution.

Here's an example of a simple script to log in to the router and show the version:

from netmiko import ConnectHandler

device = ConnectHandler(device_type='cisco_ios', ip='192.168.255.249', username='cisco', password='cisco')
output = device.send_command("show version")
print (output)
device.disconnect...