What this site is all about
The purpose of this site to explore interesting, caveat and quirky scenarios that make Network Engineering interesting and fun. Blogs will be posted once every few months and share a variety of scenarios with a focus on an Internet Service Provider perspective.
A secondary function of this site is to share knowledge. This includes study notes, general information, GNS3 topologies, scripts and the like.
This site is laid out into the following sections:
- Posts – My main page where I will blog about quirks that I come across. Posts will either discuss a general topics of interest or specific quirky scenarios. When discussing a scenario, each post will be divided into 3 parts:
- The quirk – the scenario description
- The search – or processes involved in working towards a solution
- The work – the technical details (including CLI if applicable) used to implement the solution.
- Notes & Cheat Sheets – My documentation, including study notes, how-to documents and cert guides.
- GNS3 – Preconfigured GNS3 topologies for download.
- IOS vs XR – A like-for-like comparison of Cisco IOS and IOS-XR CLI configuration for a range of topologies and scenarios.
- Acronym Index – Just what it says, a list of networks acronyms sorted by topic. To be updated over time.
- Scripts (coming soon) – Still under development at the moment. In future it will link to GitHub based scripts, usually python, to aid in areas like network automation. A BGP Peering script call peerpal will be available soon.
My name is Steve Crutchley and I’m a Network Engineer living and working in central London. Originally from New Zealand, I currently work on the core Networks team for a Managed Service Provider.
As I have progressed through my career I’ve come across a lot of unique scenarios that have helped me grow and learn. I believe it would be beneficial, both for others and myself, to share some of these scenarios. In addition to this, I have made a plethora of study notes and on the job documentation throughout my time as an engineer. My colleagues have frequently commented that it would be handy to access to these notes and that they could come in useful for others.
My experience includes an array of Networking technologies. From Routing and Switching, Voice, ASA/Juniper Firewalls, Python and Java programming and more. From a CLI perspective, I’ve largely dealt with Cisco, but have experience in ScreenOS and Junos as well.
I hold the following certifications and am currently working towards CCNP SP:
- Bachelor of Science – Majoring in Computer Science
- Bachelor of Arts – Majoring in Logic and Computation
- CCNA Routing and Switching
- CCNA Voice
- CCNA Security
- CCNA Service Provider
- CCNP Routing and Switching
- ITIL Foundations version 3
This is the first blog site I have ever made, so I imagine it will change and grow over time. I will do my best to make the information I share interesting and informative. I hope you enjoy the read.
There is a base assumption that those using this site have a good grasp of networking in general. Much though I would like to, I can’t devote this site to teaching my understanding of networking from the ground up. Besides having gaps in my own humble knowledge, there are plenty of very good sites out there already teaching networking fundamentals.
Where you come in
In the hopes of finding out what works and what doesn’t, I would be very interested in getting feedback on which blogs and features are useful and which are not. If there is a topic, lab or script that you’d like to see, let me know. Perhaps most crucially, if you believe I have made a technical error please feel free to hit me up about it. I’ve done my best to make the information here as accurate as possible but mistakes happen.
The best way to get in touch is through the contact page.
I should note that whilst some of the ideas and blogs on this site are drawn from my own experience, they do not necessarily reflect the specific scenarios, configurations or design solutions of any company I have worked with or their customers.
It should also be pointed out that notes and documents will reference public IP addresses. This is not a reference in any way to the holder of that public IP and any such implication is entirely unintentional.
With respect to the certification guides found in the Docs section, some of the guides are for out of date versions of the certifications. Whilst the certifications I hold are current and valid, the courses’ content may have changed since the notes were first produced. Having said that, they should still cover a significant amount of the current course curriculum.