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jncis juniper junos routing 

BFD ON JUNOS! BIDIRECTIONAL FORWARDING DETECTION – JUNIPER-CONFIG, MULTI-VENDOR EXPLANATION!

September 12, 2020March 24, 2024 Chris 25694 Views 2 Comments

BFD is a protocol that gives all your other protocols sub-second failure detection times. Very useful! This blog post uses Junos config, but the explanation is multi-vendor. Give it a read!

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bgp juniper junos mpls vpn 

JUNIPER JNCIP-SP: USING INDEPENDENT-DOMAIN TO TUNNEL CUSTOMER BGP VPN PREFIXES

August 22, 2020March 24, 2024 Chris 13086 Views 1 Comment

The independent-domain command is a little-known but big-useful command. Let’s see how we can use it in Junos to tunnel localpref info from one VPN customer site to another!

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isis junos 

REDISTRIBUTING YOUR ENTIRE IS-IS NETWORK BY MISTAKE: BEWARE THIS DEFAULT BEHAVIOUR!

July 21, 2020March 24, 2024 Chris 12998 Views 2 Comments

If you leave IS-IS to its default config, you could cause something big to impact your network! And chances are, even if you think you know what that impact is, you might not have worked out the whole story. Click here to read the lesson I learned in my lab!

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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, 2020March 24, 2024 Chris 86304 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, 2020March 24, 2024 Chris 18974 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, 2020March 24, 2024 Chris 28303 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, 2020March 24, 2024 Chris 17276 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, 2020March 24, 2024 Chris 22645 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, 2020March 24, 2024 Chris 12951 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, 2020March 24, 2024 Chris 28482 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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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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