the worlds gone mad

we've lost the hope we had

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.

Posted on 22 April 2018   14 min read

Cisco Express Forwarding (CEF)

cef, fib and adjacency tables

I am currently studying to rectify my CCIE and it is at these times that I realise there is so much I have studied and learnt but forgotten. There are many cool things I come across that I think at the time are useful features that I need to remember, but unfortunately if you don’t have a real world use for them they are soon put to the back of the brain and over time forgotten. The same applies with taking for granted the way things work, be that ARP, DHCP or the process a switch or router goes through when moving traffic. I came across some of my old notes on CEF which I thought worth sharing.