EVE-NG Cloud NAT

Sunday, 6 June 2021   5 min read

This post explains how to configure EVE-NG as a DHCP server (isc-dhcp-server) assigning IPs to lab devices that are then dynamically NATed behind the primary EVE management IP address (iptables masquerade) to provide Internet breakout.

The Evolution of Labbing

Thursday, 27 May 2021   6 min read

A trip down memory lane on how things have changed in labbing from using prehistoric switches bought on eBay through emulators that took longer to configure than the labs to the present day solutions that can programmatically build a multi-vendor lab in minutes. Kids today don’t know they are born…..

Automate Leaf and Spine Deployment - Part6

Tuesday, 23 March 2021   14 min read

The 6th post in the ‘Automate Leaf and Spine Deployment’ series goes through the validation of the fabric once deployment has been completed. A desired state validation file is built from the contents of the variable files and compared against the devices actual state to determine whether the fabric and all the services that run on top of it comply.

Automate Leaf and Spine Deployment - Part5

Saturday, 20 March 2021   25 min read

The 5th post in the ‘Automate Leaf and Spine Deployment’ series goes through the deployment of the services that run on top of the fabric. These services are grouped into 3 categories, tenant, interface and routing. Services are configured only on the leaf and border switches, the spines have no need for them as they just route the VXLAN encapsulated packets with no knowledge or care of what is within them.

Automate Leaf and Spine Deployment - Part4

Tuesday, 23 February 2021   9 min read

The 4th post in the ‘Automate Leaf and Spine Deployment’ series goes through the creation of the base and fabric config snippets and their deployment to devices. Loopbacks, NVE and intra-fabric interfaces are configured and both the underlay and overlay routing protocol peerings formed leaving the fabric in a state ready for services to be added.

Automate Leaf and Spine Deployment - Part3

Saturday, 13 February 2021   15 min read

The 3rd post in the ‘Automate Leaf and Spine Deployment’ series goes the through the variables from which the core fabric declaration is made and how this transposes into a dynamic inventory. This uses only the base and fabric roles to create the fabric ready for the service sub-roles (tenant, interface and route) to be deployed on top of the fabric at a later stage.

Automate Leaf and Spine Deployment - Part2

Monday, 8 February 2021   4 min read

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.

Automate Leaf and Spine Deployment - Part1

Sunday, 31 January 2021   18 min read

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.