Book Image

Network Automation Cookbook

By : Karim Okasha
Book Image

Network Automation Cookbook

By: Karim Okasha

Overview of this book

Network Automation Cookbook is designed to help system administrators, network engineers, and infrastructure automation engineers to centrally manage switches, routers, and other devices in their organization's network. This book will help you gain hands-on experience in automating enterprise networks and take you through core network automation techniques using the latest version of Ansible and Python. With the help of practical recipes, you'll learn how to build a network infrastructure that can be easily managed and updated as it scales through a large number of devices. You'll also cover topics related to security automation and get to grips with essential techniques to maintain network robustness. As you make progress, the book will show you how to automate networks on public cloud providers such as AWS, Google Cloud Platform, and Azure. Finally, you will get up and running with Ansible 2.9 and discover troubleshooting techniques and network automation best practices. By the end of this book, you'll be able to use Ansible to automate modern network devices and integrate third-party tools such as NAPALM, NetBox, and Batfish easily to build robust network automation solutions.
Table of Contents (15 chapters)

Configuring interfaces on IOS devices

In this recipe, we will outline how to configure the basic interface properties on Cisco IOS-based devices, such as setting the interface description, the interface maximum transmission unit (MTU), and enabling interfaces. We will configure all the links within our topology as having a link MTU of 1,500 and to be fully duplex.

Getting ready

To follow along with this recipe, an Ansible inventory is assumed to be already set up, as is IP reachability between the Ansible control node with the Cisco devices in place.

How to do it...

  1. In the group_vars/network.yml file, add the following content to define the generic interface parameters:
$ cat group_vars/network.yml
<-- Output Trimmed for brevity ------>
intf_duplex: full
intf_mtu: 1500
  1. Create a new file, lan.yml, under the group_vars folder, with the following data to define the interfaces on our Cisco devices:
$ cat group_vars/lan.yaml

- name: Ethernet0/1
description: access01_e0/1
mode: trunk
- name: Ethernet0/2
description: access02_e0/1
mode: trunk
- name: Ethernet0/3
description: core01_e0/3
mode: trunk
<-- Output Trimmed for brevity ------>
- name: Ethernet0/1
description: core01_e0/1
mode: trunk
- name: Ethernet0/2
description: core02_e0/1
mode: trunk
- name: Ethernet0/3
description: Data_vlan
mode: access
vlan: 10
  1. Update the pb_build_network.yml playbook file with the following task to set up the interfaces:
    - name: "P1T3: Configure Interfaces"
name: "{{ }}"
description: "{{ item.description }}"
duplex: "{{ intf_duplex }}"
mtu: "{{ intf_mtu }}"
state: up
loop: "{{ interfaces[inventory_hostname] }}"
register: ios_intf

How it works...

In this recipe, we outline how to configure the physical interfaces on IOS devices. We first declare the generic parameters (interface duplex and MTU) that apply to all the interfaces. These parameters are defined under the network.yml file. Next, we define all the interface-specific parameters for all our LAN devices under the lan.yml file to be applied to all devices. All these parameters are declared in the interfaces dictionary data structure.

We update our playbook with a new task to configure the physical parameters for all of our LAN devices in our network. We use the ios_interface module to provision all the interface parameters, and we loop over all the interfaces in each node using the interfaces data structure. We set the state to up in order to indicate that the interface should be present and operational.

See also...