Cisco

In this post I will be quickly running through the basic setup and configuration of BIRD, an open-source routing protocol daemon for…

I was recently pulled in to support a migration project, where some H3C firewalls were being swapped out for Cisco ASAs. While the base…

We have a shiny new Segment-Routing MPLS core, and one of the many available features this brings is enhanced Traffic Engineering. Here we…

BGP resets are a common operational tool employed to manipulate exchanged routing tables and to troubleshoot faulty routing operation. Here…

So, Cisco have an awesome python script on their github here, and at the time of writing the repo has only 5 stars (yours truly included).…

Cisco Software Manager (CSM) is an orchestration and management platform for Cisco ASR9K IOS-XR devices that provides a framework for the…

So your shiny new Cisco device now comes with some added toys, such as a fully-fledged built-in Linux environment complete with YUM package…

Rolling out new VLANs across a network can be time consuming. The Ansible playbook documented in this post automates the configuration and…

Hi guys! In this post I am demonstrating the use of Ansible's Jinja2 templating module, and the applications it can be utilized for within a…

This is a quick glimpse at a production application of Ansible to automate your infrastructure Access-Control-Lists. Access-Control-Lists…

This blog post is about SNMPv3. As many Engineers familiar with SNMP will know, SNMP is a powerful protocol that can divulge a lot of…

Regular expressions, or regex, are templates to match text patterns. They provide a way to describe and parse text, and provide a flexible…

IS-IS is a very powerful Link-State routing protocol that is often overlooked and shied away from. Officially removed from Cisco's CCNP…

VRF, or Virtual Routing and Forwarding, is an IP technology part of Cisco's MPLS/VPN suite used to virtualise logical Routing Tables on a…

IP addresses consist of 4 bytes of data. Each byte (or octet) can range from a value of 0 to 255, resulting in a total number of…

BGP is a Path-Vector Routing Protocol. Similar to RIP, BGP uses hop-count as it's primary metric for finding the best route, but BGP uses…

A very powerful tool I would like to mention in this entry is Clogin. Clogin, or Cisco-Login, is a part of the RANCID toolkit, or the…

Internet Protocol, originally designed in 1977, is a Layer 3 protocol for packet-switched networks. IP is a connection-oriented…

Overview EIGRP is a Cisco-proprietary routing protocol that combines the simplicity and low overhead of Distance Vector protocols with the…

In the early days of TCP/IP Networking, there was RIP. Now at the time RIP was the perfect Protocol for small private Networks; it was easy…

The story of the Internet begins in the late 1960's, researchers at MIT have just succeeded in transferring data from one computer to…