Latest:
  • Your “Multihop” BGP Session Probably Isn’t Multi-Hop
  • A Beginners Guide to Junos Firewall Filters
  • How to Increase the CLI Character Limit in Junos
  • Route Distinguishers: The Secret To Load Balancing In Multihomed MPLS VPNs
  • Junos: IS-IS Study Notes, Part 5 – Troubleshooting (For JNCIS-SP and JNCIS-ENT Students)
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junos

bgp jncis juniper junos junos for ios engineers mpls routing vpn 

ROUTE DISTINGUISHERS vs ROUTE TARGETS: WHAT’S THE DIFFERENCE? (JUNOS FOR CISCO IOS ENGINEERS)

May 10, 2020June 8, 2022 Chris 44014 Views 19 Comments

In this post we use both Cisco IOS and Juniper Junos config to see the difference between route-distinguishers and route-targets in MPLS VPNs. Why do we need both of them? Click here to find out!

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jncia juniper junos junos for ios engineers ospf 

JUNOS FOR IOS ENGINEERS: HOW DO YOU CONFIGURE A JUNOS ROUTER?

May 4, 2020June 8, 2022 Chris 8520 Views 2 Comments

In Part 2 of this series we look at how you make configuration changes in Junos – and how you can very easily scrap your changes without doing any damage o your network. Very clean!

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juniper junos python 

USING PYTHON TO CREATE 12,000 LINES OF JUNIPER SRX CONFIG IN 0.01 SECONDS

April 5, 2020June 8, 2022 Chris 13184 Views 8 Comments

This post assumes ZERO Python knowledge on your part! You don’t even need Junos knowledge: I’ll do my best to make this useful for folks of ALL skill levels. If you’ve ever wanted to learn Python, but never knew where to start… read on!

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junos junos for ios engineers ospf 

JUNOS FOR IOS ENGINEERS: HOW DO I READ A JUNOS CONFIG?

March 22, 2020June 8, 2022 Chris 8568 Views 2 Comments

In this first part of my new series, I explain why a Junos config looks the way it does. What’s wth the curly brackets and the spacing? Click to find out!

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junos junos for ios engineers 

NEW SERIES: A GUIDE TO JUNOS, FOR IOS ENGINEERS

March 12, 2020June 8, 2022 Chris 11211 Views 4 Comments

Are you an IOS engineer? Are you confused as heck about how Junos works? Then you’ve come to the right place. Welcome to this introductory post on Junos For IOS Engineers!

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juniper junos multicast routing 

MULTICAST: IGMP VERISON 3 ON JUNIPER ROUTERS (FOR JNCIP & JNCIE STUDENTS)

March 7, 2020June 8, 2022 Chris 6424 Views 0 Comments

Today we’re looking at what advantages IGMPv3 brings to the table! Give this a read to see packet captures and full config for the whole topology.

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juniper junos 

JNCIP-ENT: THE ULTIMATE RESOURCE FOR JUNIPER’S PROFESSIONAL ENTERPRISE CERT

January 19, 2020June 8, 2022 Chris 13990 Views 10 Comments

If you’re thinking about taking Juniper’s excellent Professional Enterprise exam, give this post a read – I’ve hooked you up with a ton of useful links to help you to succeed!

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juniper junos multicast 

MULTICAST: IGMP ON JUNIPER ROUTERS, FOR JNCIP & JNCIE STUDENTS

January 7, 2020June 8, 2022 Chris 10524 Views 0 Comments

IGMP is a really simple protocol – but if you want to be an expert, you’ll want to know what’s happening at a packet level. That’s why in this post we have lots of fun with packet captures. If you’re studying for JNCIP or even JNCIE, you won’t want to miss this post!

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juniper junos multicast 

A BEGINNER’S GUIDE TO MULTICAST, ON JUNIPER ROUTERS. PART 1: THE THEORY.

December 16, 2019June 8, 2022 Chris 13037 Views 6 Comments

This is the first in my new series of posts about multicast! In later posts we’ll focus on Junos configuration. But first, let’s get nice and comfortable with the theory. Click here to learn all about it!

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juniper junos mpls routing vpn 

HUB-AND-SPOKE MPLS L3VPNs – ADVANCED CUSTOMISATION, ON JUNIPER JUNOS ROUTERS

September 7, 2019June 8, 2022 Chris 6692 Views 0 Comments

Hey there: this is part 3 in my series on hub-and-spoke MPLS VPNs! In this post we see the dangers of commands like as-override and independent-domain – and then, we see how to fix the problems they cause. Strap in!

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Hi there!

Welcome to my blog of networking and nonsense.

I’m Chris. By day I’m a London-based network engineer, instructor, and courseware developer for Juniper Networks. But in my spare time I come here to write some sweet sweet blog posts to help you with your networking studies, with just as much focus on fun as on the tech. I hope you like what you see!

In this corner of the information super-highway you’ll find tons of stuff about BGP, MPLS, OSPF and IS-IS. If that sounds fun then you’ve come to the right place. You’ll also find posts I made on my journey towards JNCIE-SP, which I hope will help you on your own journey.

There’s a big focus on Juniper and Junos in this blog, but tons of the theory is entirely vendor-neutral. No matter what networking platform you’re more comfortable with, you’re very welcome here.

Please note that it costs £750,000 to read my posts. This is enshrined in international law, and late payment will result in the fee being scrapped and replaced with a £25 fine. I did ask the United Nations to scrap this law entirely, but they insisted that it stayed. Sorry readers, it’s out of my control.

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