In this post, I will outline the configuration for a VXLAN fabric using BGP EVPN and OSPF as the underlay. This is similar to my previous Arista project and VXLAN project. The topology of this post will be four switches and six clients. For the configuration, I will go section by section for each device […]
Cisco Nexus EVPN VXLAN Fabric Read More »
These are the base configs I have used in my lab for all the Nexus switches. It’s enough for me to get SSH access and to use the API. Spine1 Spine2 Leaf1 Leaf2
Cisco Nexus EVPN VXLAN Fabric GNS3 Setup Read More »
If you already have ACI running and then want to move to a DevOps approach and bring that configuration into Terraform, how can that be performed? The ACI Terraform provider supports importing configuration. All that is required is the resource and name of that resource. In the following example, I will use the Cisco ACI
Importing ACI Configuration to Terraform Read More »
BGP Path selection relies on the BGP attributes. I have described the eight most important BGP attributes in my previous BGP Basic Information post. Weight: The path with the highest weight is preferred. This is only locally significant and not affect any other router within the AS. Cisco only, used for outbound path selection Local Preference: The
BGP Path Selection Read More »
Cisco ACI Supports several methods of automation or infrastructure as code. For this example, I will be using Terraform to give examples of setting up different fabric policies using the Cisco ACI lab. Setup To get this setup, I have several things to do Lab Once the lab has been setup and VPN connected to
Cisco ACI – Automation Read More »
Cisco ACI is a software defined networking solution to control the management and monitoring of a VXLAN network. I know for myself and I think it is common that ACI is confusing at first as to why it’s required and what it actually solves. So I like to think of it as a third iteration
Cisco ACI – Application Centric Infrastructure Part 1 Read More »
BGP, Border Gateway Protocol, is the routing protocol that connects the internet, and it is versatile enough to be used from small to large environments. This will be a small reference for BGP basic knowledge. – Basics of BGP – Confederations – Route Reflectors – Neighbour Formations – Path Selection – BGP Synchronisation – BGP
Basic BGP Information Read More »
This is something new that I decidced to try out. Using an AI chatbot to generate a base configuration for Linux, Cisco, Arista etc. I do not know all of the Cisco commands for every feature, nor do I have the ability to memorise all the Python functions or Linix configuration. I use Google to
Using ChatGPT to Generate Config Read More »
In the previous XMPP post, I was using local users in the XMPP ejabberd server. There was command authorisation in the form of a setting on the XMPP configuration of each Arista switch. The default is 1, however this will not permit show run, or configuration commands and others. This post will explain how to
Using ISE AAA TACACS For Arista XMPP Read More »
As ISE is using an API, Python can be used to interact with the API. This allows the use of programmatic logic to create, read, update or delete ISE elements. Basic GET I have created a simple GET that will just print the dACLs that ISE has. This is exactly the same API request and
ISE Lab: API 5 – Using Python Read More »