the worlds gone mad

we've lost the hope we had

Posted on 8 February 2021   4 min read

Automate Leaf and Spine Deployment - Part2

input variable validation

The 2nd post in the ‘Automate Leaf and Spine Deployment’ series describes process used for validating the variable files format and content. The idea behind this offline pre-validation is to catch any errors in the variable files before device configuration is attempted. Fail fast based on logic instead of failing halfway through a build. It wont catch everything but will eliminate a lot of the needless errors that would break a fabric build.

Posted on 31 January 2021   18 min read

Automate Leaf and Spine Deployment - Part1

introduction and playbook structure

This series of posts will describe the process of deploying a NXOS Leaf and spine fabric in a declarative manner using Ansible. This came from my project for the IPSpace Building Network Automation Solutions course and was used in part when we were deploying leaf and spine fabrics in our Data Centers. I originally only planned to build tenants and do fabric validation but over time this has morphed into a full blown fabric deployment.

Posted on 27 September 2020   10 min read

Configure NXOS with Napalm

using ansible napalm to configure n9kv

Napalm offers an easy way to configure and gather information from network devices using a unified API. No matter what vendor it is used against the input task and returned output will be the same. The only thing that will not be vendor neutral is the actual commands run and configuration being applied. This post documents experiences of trying to replace the whole configuration on NXOS using Napalm with Ansible.

Posted on 12 August 2020   4 min read

Jinja Template Inheritance

block and extends

Jinja template inheritance uses the concept of block to define sections of the base parent template that can be overridden by sections from a child template. An extends statement links the child template to the parent template so that when the child template is rendered the parent template is also rendered and the block statement contents inherited by the parent template.

Posted on 13 August 2019   7 min read

Checkpoint Endpoint Security VPNs

remote access VPN on checkpoints

Posted on 31 May 2019   2 min read

Enable SNMP on ESX

enabling snmp on esx hosts

Posted on 3 May 2018   9 min read


ospf database and lsa types

Link-state advertisements (LSA) are used to communicates the router’s local routing topology to all other local routers in the same OSPF area. There are 11 types of LSAs although only the 6 most commonly used ones are described in this post.