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Cerberus For Schema Validation

Schema validation with Cerberus.

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Cerberus For Schema Validation

Cerberus is a lightweight python library that can be used to validate the correct data is being supplied to configuration management tools such as Ansible and Salt or perhaps even Jinja directly. Along with having many useful built in features, Cerberus also makes it relatively straight...

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Network Notes: Ethernet

The original ethernet specification was owned by DEC, Intel and Xerox hence the standard being named "Ethernet (DIX)". The ethernet specification has been through a number of updates over the years beginning with the IEEE standard in the early 1980's and going through many revisions....continue reading

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Network Notes: VLAN

Virtual Local Area Network (VLANs) are used to logically partition physical switch ports into multiple smaller broadcast domains. VLAN A VLAN is a logically segmented group of physical switchports that reduces the broadcast domain of the physical ports to the ports within the...continue reading

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Network Notes: EIGRP

EIGRP is an 'advanced' distance vector routing protocol and is the evolution of IGRP. Originally EIGRP was a Cisco proprietary protocol but in 2013 Cisco announced its intention to make EIGRP on open standard. At the time of writing there is an only informational RFC: RFC7868. ...continue reading

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Linux Shell Tips and Tricks

A collection of useful linux shell tips and tricks.

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Linux Shell Tips and Tricks

A collection of useful tips and tricks for the linux shell that I have stumbled across over the years. I'll keep updating this post as I come across something of value. I use bash, so these apply to bash unless noted otherwise but my work in other shells. cat The cat command can be...

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Viptela SDWAN Overview

High level overview of the Viptela SDWAN solution.

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Viptela SDWAN Overview

Viptela is an SDWAN company that was recently purchased by Cisco. In this post I will go over the components that make up the Viptela secure extensible network (SEN) solution. By the end of this post you will have a good idea of the pieces that make up the Viptela puzzle. Network...

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Network Notes: RIP

Routing information protocol (RIP) is a interior distance vector routing protocol originally defined in RFC1058. RIP has had a number of improvements over the years with version 2 being defined RFC2453 and RIPng adding IPv6 support in RFC2080. Transport RIPv1 and RIPv2...continue reading

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Salt SSH Getting Started

Install, configure and use Salt in SSH mode.

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Salt SSH Getting Started

Salt SSH allows you to execute commands and apply state to minions without having to install a salt-minion. The only requirement is for the minion to have python installed unless using the -r option to execute raw commands. For reference the following software will be used in this post. ...

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Ansible Tips and Tricks

A collection of useful Ansible tips and tricks.

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Ansible Tips and Tricks

A collection of useful tips and tricks for Ansible which don't really justify a full blog post on their own. I'll keep updating this post when I come across something of value. Callbacks Convert the output of a playbook run to json. Either set the stdout_callback = json setting in...

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Cisco IOSXRv Vagrant Libvirt Box Install

Build a Cisco IOSXRv Vagrant box for use with the libvirt provider.

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Cisco IOSXRv Vagrant Libvirt Box Install

In this post I will cover how to create a Cisco IOSXRv Vagrant box for use with the vagrant-libvirt provider as well as enabling the netconf API. This post assumes a working installation of Vagrant with the vagrant-libvirt plugin already installed. You can follow this post to get the...

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Oxidized Gitlab Storage Backend

Backup device configurations to gitlab.

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Oxidized Gitlab Storage Backend

In a previous post I installed and configured Oxidized using the local file system for storage. In this post I will configure Oxidized to use Gitlab community edition as a storage backend. For reference the following software will be used in this post. Oxidized - 0.21.0 Oxidized...

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Oxidized Getting Started

Install and configure Oxidized.

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Oxidized Getting Started

Oxidized is a network device configuration backup tool which was developed to be a replacement for Rancid. Oxidized is written in Ruby and is quite extensible, at the time of writing it supports collection of configuration for over 90 network operating system types. In this post I will...