Automation

Linux SSH Session Management for Network Engineers

A short post about how I do SSH session management for network devices in Linux

Using YANG Models in Ansible to Configure and Verify State of IOS-XE and JUNOS Devices

In this post I will show how to use IETF, OpenConfig and vendor-specific YANG models in Ansible to configure BGP peering and verify state of physical interfaces between IOS-XE and JUNOS devices.

Configuring Cisco IOS XE With YANG-based YAML Files

One thing that puts a lot of network engineers off NETCONF and YANG is the complexity of the device configuration process. Even the simplest change involves multiple tools and requires some knowledge of XML. In this post I will show how to use simple, human-readable YAML configuration files to instantiate YANG models and push them down to network devices using a single command

Configuring Cisco IOS XE With YDK and OpenDaylight

Now it’s time to turn our gaze to the godfather of YANG models and one of the most famous open-source SDN controllers, OpenDaylight. In this post I’ll show how to connect Cisco IOS XE device to ODL and use Yang Development Kit to push a simple BGP configuration through ODL’s RESTCONF interface

Introduction to YANG Programming and RESTCONF on Cisco IOS XE

The sheer size of some of the YANG models can scare away even the bravest of network engineers. However, as it is with any programming language, the complexity is built out of a finite set of simple concepts. In this post we’ll learn some of these concepts by building our own YANG model to program static IP routes on Cisco IOS XE

Getting Started With NETCONF and YANG on Cisco IOS XE

Everyone who has any interest in network automation inevitably comes across NETCONF and YANG. These technologies have mostly been implemented for and adopted by big telcos and service providers, while support in the enterprise/DC gear has been virtually non-existent. Things are starting to change now as NETCONF/YANG support has been introduced in the latest IOS XE software train. That’s why I think it’s high time I started another series of posts dedicated to YANG, NETCONF, RESTCONF and various open-source tools to interact with those interfaces

Automating the Build of OpenStack Lab (Part 2)

In this post we’ll use Chef, unnumbered BGP and Cumulus VX to build a massively scalable ‘Lapukhov’ Leaf-Spine data centre

Automating the Build of OpenStack Lab (Part 1)

In this post we will explore what’s required to perform a zero-touch deployment of an OpenStack cloud. We’ll get a 3-node lab up and running inside UNetLab with just a few commands