Latest:
  • MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 2: AUTO-BANDWIDTH
  • MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 1: RSVP BANDWIDTH & PRIORITIES
  • JUNOS: MPLS SELF-PING, ON JUNIPER ROUTERS
  • I HAD FUN ON JUNIPER’S SUBSCRIBER MANAGEMENT COURSE!
  • BFD ON JUNOS! BIDIRECTIONAL FORWARDING DETECTION – JUNIPER-CONFIG, MULTI-VENDOR EXPLANATION!
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LATEST POSTS

MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 2: AUTO-BANDWIDTH
juniper junos mpls 

MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 2: AUTO-BANDWIDTH

January 10, 2021 Chris 0

Setting RSVP bandwidth reservations automatically is very prone to error. Luckily, there’s a better way: we can automate the whole thing using the Junos auto-bandwidth command. Let’s take a look at some cool new Juniper config!

MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 1: RSVP BANDWIDTH & PRIORITIES
isis juniper junos mpls routing 

MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 1: RSVP BANDWIDTH & PRIORITIES

December 14, 2020 Chris 0

RSVP lets us create LSPs that reserve bandwidth in advance. And that’s exactly what this three-part blog post series is all about! In this first post we’re going to learn how we combine bandwidth and priorities to get the most out of the bandwidth in our network. Click here for good times!

JUNOS: MPLS SELF-PING, ON JUNIPER ROUTERS
junos mpls 

JUNOS: MPLS SELF-PING, ON JUNIPER ROUTERS

December 6, 2020 Chris 5

If you’re an ISP running Juniper, it’s essential that you allow MPLS Self-Ping. If you don’t… weird things happen. Click to find out more!

I HAD FUN ON JUNIPER’S SUBSCRIBER MANAGEMENT COURSE!
juniper junos 

I HAD FUN ON JUNIPER’S SUBSCRIBER MANAGEMENT COURSE!

October 20, 2020 Chris 0

Subscriber Management is a real dark art. Not many folks know it. And yet, it’s essential for ISPs offering xDSL and fibre connectivity. This Juniper course taught me a lot about it. Click to find out more!

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

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

September 12, 2020 Chris 2

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!

JUNIPER JNCIP-SP: USING INDEPENDENT-DOMAIN TO TUNNEL CUSTOMER BGP VPN PREFIXES
bgp juniper junos mpls vpn 

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

August 22, 2020 Chris 0

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!

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

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

July 21, 2020 Chris 2

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!

JUNOS FOR CISCO IOS ENGINEERS: SAVING YOUR CONFIG – WITH POWER!
junos for ios engineers 

JUNOS FOR CISCO IOS ENGINEERS: SAVING YOUR CONFIG – WITH POWER!

July 6, 2020 Chris 5

In Part 3 of this, we see how Junos takes saving configurations to the next level, and gives us HUGE power. Checking our work, rolling back to older configs, automatically rolling back to fix problem – we can do so much with Junos. Let’s find out how!

MY JUNIPER JNCIS-SP WEBINAR: A SLIDESHOW FULL OF ADVICE TO HELP YOU STUDY
jncis juniper junos 

MY JUNIPER JNCIS-SP WEBINAR: A SLIDESHOW FULL OF ADVICE TO HELP YOU STUDY

June 22, 2020 Chris 2

I recently hosted a webcast for Juniper, to help folks studying for the JNCIS-SP exam. Give this a read to find out some cool study tips!

ROUTE DISTINGUISHERS vs ROUTE TARGETS: WHAT’S THE DIFFERENCE? (JUNOS FOR CISCO IOS ENGINEERS)
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, 2020 Chris 14

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!

JUNOS FOR IOS ENGINEERS: HOW DO YOU CONFIGURE A JUNOS ROUTER?
jncia juniper junos junos for ios engineers ospf 

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

May 4, 2020 Chris 2

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!

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

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

April 5, 2020 Chris 7

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!

JUNOS FOR IOS ENGINEERS: HOW DO I READ A JUNOS CONFIG?
junos junos for ios engineers ospf 

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

March 22, 2020 Chris 0

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!

NEW SERIES: A GUIDE TO JUNOS, FOR IOS ENGINEERS
junos junos for ios engineers 

NEW SERIES: A GUIDE TO JUNOS, FOR IOS ENGINEERS

March 12, 2020 Chris 4

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!

MULTICAST: IGMP VERISON 3 ON JUNIPER ROUTERS (FOR JNCIP & JNCIE STUDENTS)
juniper junos multicast routing 

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

March 7, 2020 Chris 0

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.

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

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

January 19, 2020 Chris 8

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!

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

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

January 7, 2020 Chris 0

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!

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

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

December 16, 2019 Chris 6

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!

MY JNCIE-SP EXAM EXPERIENCE
Uncategorized 

MY JNCIE-SP EXAM EXPERIENCE

December 2, 2019 Chris 10

It’s official: as of November 2019, I am now JNCIE-SP #2981. And I have the socks to prove it. Click to find out what exam day was like, and whether I think you should take the exam yourself.

HOW TO STUDY NETWORK ENGINEERING, WITHOUT FEELING GUILTY FOR NOT STUDYING
Uncategorized 

HOW TO STUDY NETWORK ENGINEERING, WITHOUT FEELING GUILTY FOR NOT STUDYING

October 3, 2019 Chris 6

Oh boy, studying for networking can be overwhelming! There’s so much to learn, and so little time. If you feel that way, hopefully some of the tips in this post will help you to study smart, not hard.

HUB-AND-SPOKE MPLS L3VPNs – ADVANCED CUSTOMISATION, ON JUNIPER JUNOS ROUTERS
juniper junos mpls routing vpn 

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

September 7, 2019 Chris 0

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!

HUB-AND-SPOKE MPLS L3VPNs WITH ONE INTERFACE, ON JUNIPER JUNOS ROUTERS
bgp juniper junos mpls vpn 

HUB-AND-SPOKE MPLS L3VPNs WITH ONE INTERFACE, ON JUNIPER JUNOS ROUTERS

August 30, 2019 Chris 0

There’s a few different ways of configuring a hub-and-spoke MPLS VPN. In this blog post we learn all about the “one interface” approach. Whether you’re an architect or a student of the JNCIE, you’ll want to know this one inside out!

HUB-AND-SPOKE MPLS L3VPNs WITH TWO INTERFACES, ON JUNIPER JUNOS ROUTERS
bgp juniper junos mpls vpn 

HUB-AND-SPOKE MPLS L3VPNs WITH TWO INTERFACES, ON JUNIPER JUNOS ROUTERS

August 24, 2019 Chris 0

Hub-and-Spoke VPNs work a little differently than your regular full-mesh MPLS VPN. Want to learn the extra config required for this unique topology? Then click this post for some good learning!

TERMINATING ACTIONS IN JUNOS ROUTING POLICY (Sample Chapter from Juniper’s Ambassadors Cookbook 2019)
bgp jncis juniper junos routing 

TERMINATING ACTIONS IN JUNOS ROUTING POLICY (Sample Chapter from Juniper’s Ambassadors Cookbook 2019)

August 18, 2019 Chris 2

Routing policy in Junos can be a little confusing for beginners – but when it clicks, you’ll see that you can do some truly powerful stuff! Give this post a read to learn all about it!

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 3: USING RSVP, AND PUTTING BGP-LU INTO INET.0
juniper junos mpls routing vpn 

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 3: USING RSVP, AND PUTTING BGP-LU INTO INET.0

July 10, 2019 Chris 2

In this third and final post on Interprovider Option C, we replace LDP with RSVP. Plus, we see the impact of putting BGP-LU in Juniper’s inet.0 table. Put your science hat on, and click here!

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 2: THE THREE LABEL STACK, AND THE USE CASE VS OPTION B
bgp juniper junos mpls routing vpn 

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 2: THE THREE LABEL STACK, AND THE USE CASE VS OPTION B

July 10, 2019 Chris 0

In Part 2 of this series we take a look at the label stack in Interprovider Option C. Plus, we look at the use case, and compare it to Option B. Plus: win a trillion pounds! (Not true)

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 1: CONFIGURATION WITH LDP (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)
bgp juniper junos mpls routing vpn 

INTERPROVIDER OPTION C, ON JUNIPER JUNOS ROUTERS – PART 1: CONFIGURATION WITH LDP (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)

July 10, 2019 Chris 2

The first in a three-part series explaining Interprovider Option C on Juniper routers! In this post: what is it, and how is it configured? Click here to obtain that 420-69 IQ you’ve always dreamed of.

A QUIRK OF TRACEROUTE THAT YOU’LL WANT TO KNOW ABOUT
ipv6 routing troubleshooting 

A QUIRK OF TRACEROUTE THAT YOU’LL WANT TO KNOW ABOUT

June 27, 2019 Chris 4

Traceroute seems such an obvious tool. Who would ever have thought there were so many gotchas? Give this post a read to learn a new one you probably didn’t know!

BGP LABELED-UNICAST ON JUNIPER ROUTERS (FOR JNCIE-SP STUDENTS)
bgp juniper junos mpls routing 

BGP LABELED-UNICAST ON JUNIPER ROUTERS (FOR JNCIE-SP STUDENTS)

May 29, 2019 Chris 19

BGP Labeled-Unicast is the key to making Interprovider Option C work. So, before we learn how to use Option C to extend an MPLS VPn between two ISPs, let’s learn all about this interesting address family. And if you like, we can even hold hands while we learn!

INTERPROVIDER OPTION B, ON JUNIPER JUNOS ROUTERS (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)
bgp juniper junos mpls routing vpn 

INTERPROVIDER OPTION B, ON JUNIPER JUNOS ROUTERS (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)

May 19, 2019 Chris 4

Let’s learn how to stretch an MPLS VPN between ISPs using a thing called “Option B”. It involves a little bit of trust between the ISPs – but as we’ll see, it greatly reduces the complexity in configuration!

INTERPROVIDER OPTION A, ON JUNIPER JUNOS ROUTERS (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)
bgp isis juniper junos mpls vpn 

INTERPROVIDER OPTION A, ON JUNIPER JUNOS ROUTERS (INCLUDES FULL TOPOLOGY CONFIG!) (JNCIP-SP, JNCIE-SP)

May 12, 2019 Chris 6

Ever wondered whether it’s possible to stretch an MPLS VPN across two ISPs? Well, indeed it is! In fact, there’s three ways to do it, and in this post we learn all about the method officially known as “Option A”.

JOINING THE JUNIPER AMBASSADOR PROGRAM
Uncategorized 

JOINING THE JUNIPER AMBASSADOR PROGRAM

January 22, 2019 Chris 3

Today I had the honour of being invited to become a Juniper Ambassador! Click this post to find out exactly what that means for me, for you, and for the future of the planet as we know it…

MPLS VPNs AND JUNOS ROUTING POLICY: LESSONS IN TROUBLESHOOTING JUNIPER ROUTERS
bgp jncis juniper junos routing troubleshooting 

MPLS VPNs AND JUNOS ROUTING POLICY: LESSONS IN TROUBLESHOOTING JUNIPER ROUTERS

January 4, 2019 Chris 2

Hey there: you smell good! That’s probably because you just read Part 1 of this two-part blog post, where we learned all about BGP communities, and how route-targets are used in MPLS VPNs. Well, now you know the theory, let’s look at a problem ticket. Click here to read Part 2!

JUNOS ROUTING POLICY, BGP COMMUNITIES, AND MPLS VPNs
bgp jncis juniper junos mpls routing troubleshooting 

JUNOS ROUTING POLICY, BGP COMMUNITIES, AND MPLS VPNs

January 4, 2019 Chris 0

I fixed a ticket recently that I wanted to share with you, because it hits on three big topics at once: BGP communities, MPLS VPNs, and Junos routing policy. In this first of two posts, we’re going to learn about the theory. Click here to read all about BGP communities!

JNCIA-CLOUD: THE ULTIMATE RESOURCE FOR JUNIPER’S SDN CERTIFICATION
cloud contrail jncia juniper routing sdn 

JNCIA-CLOUD: THE ULTIMATE RESOURCE FOR JUNIPER’S SDN CERTIFICATION

November 26, 2018 Chris 24

(DISCLAIMER: This blog post was written at the end of 2018, and was accurate to the JNCIA-Cloud syllabus at the

JNCIP-SP: THE ULTIMATE RESOURCE FOR JUNIPER’S PROFESSIONAL SERVICE PROVIDER CERT
juniper junos 

JNCIP-SP: THE ULTIMATE RESOURCE FOR JUNIPER’S PROFESSIONAL SERVICE PROVIDER CERT

November 12, 2018 Chris 5

If you’re thinking about taking Juniper’s excellent Service Provider exam, give this a read – I’ve hooked you up with a ton of useful links!

LESSONS IN JUNOS TROUBLESHOOTING: FIXING A LAN WITH A WEIRD PROBLEM
juniper junos troubleshooting 

LESSONS IN JUNOS TROUBLESHOOTING: FIXING A LAN WITH A WEIRD PROBLEM

October 14, 2018 Chris 0

Regular readers of this blog probably see me as an extremely clever, flawless hunk who knows a lot, never makes mistakes, and is traditionally handsome but with a modern style. And of course, you’re not wrong. Except, here’s the twist: you’re dead wrong.

MOVING LSPs BETWEEN INET.3 and INET.0 ON A JUNIPER ROUTER
bgp jncis juniper junos mpls routing 

MOVING LSPs BETWEEN INET.3 and INET.0 ON A JUNIPER ROUTER

October 8, 2018 Chris 4

This is a post about the different ways, and reasons why, we might move prefixes between the inet.3 and inet.0 tables on a Juniper router. You know: like George Clooney does in his spare time. Probably. Don’t look that up.

JUNOS ROUTERS: WHAT DOES THE INET.3 TABLE ACTUALLY DO?
bgp jncis juniper junos mpls routing 

JUNOS ROUTERS: WHAT DOES THE INET.3 TABLE ACTUALLY DO?

October 8, 2018 Chris 15

In this first of a two-part post, I’m going to take you on a magical journey. And by “take you on a magical journey” I mean “teach you what the inet.3 table does on a Juniper router.” Which is basically the same thing as a magical journey, right?

JUNOS RPM: TESTING YOUR JUNIPER NETWORK WITH REAL-TIME PERFORMANCE MONITORS
jncis juniper junos 

JUNOS RPM: TESTING YOUR JUNIPER NETWORK WITH REAL-TIME PERFORMANCE MONITORS

August 15, 2018 Chris 2

Network engineers often find they need a way to test something, and then take some action if that test fails. Well, you can do these tests oh-so-easily in Junos with a thing called Real-Time Performance Monitoring. RPM is what “other vendors” might call IP SLA. How do they work? Good question, Andrew! Let’s find out.

USING WILDCARD MASKS TO FILTER ODD OR EVEN NUMBERED IP ADDRESSES: JUNIPER JUNOS & CISCO IOS
junos routing subnetting troubleshooting 

USING WILDCARD MASKS TO FILTER ODD OR EVEN NUMBERED IP ADDRESSES: JUNIPER JUNOS & CISCO IOS

July 16, 2018 Chris 5

Imagine a user who says they’re only able to access even-numbered IPs in a destination subnet. “Help!”, they say. “I can’t leave the office until this is fixed, and I need to leave now because my seven large sons require their tri-daily feed of protein shakes. They will whither and die unless I nourish them immediately. The fate of my powerful sons is in your hands, and yours alone.” This exact problem came in to us recently. Well, apart from the bit about the large sons.

JUNOS: IS-IS STUDY NOTES, PART 3 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS
isis jncia jncis juniper junos routing troubleshooting 

JUNOS: IS-IS STUDY NOTES, PART 3 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS

July 6, 2018 Chris 3

This is the third and final part of my whistle-stop tour of IS-IS, for people studying for their Juniper JNCIS-SP and JNCIS-ENT exams. In this post, we learn how to troubleshoot IS-IS. Are you wearing your safety hat? Then, let’s go!

JUNOS: IS-IS STUDY NOTES, PART 2 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS
isis jncia jncis juniper junos routing 

JUNOS: IS-IS STUDY NOTES, PART 2 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS

July 6, 2018 Chris 2

In Part 2 we take a deeper-dive into IS-IS. We do packet captures of LSAs, we look at the metrics, the Designated Intermediate-System, and we even explore our feelings together, so that we can finally find inner-peace with ourselves. Great!!!

JUNOS: IS-IS STUDY NOTES, PART 1 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS
isis jncia jncis juniper junos routing 

JUNOS: IS-IS STUDY NOTES, PART 1 – FOR JUNIPER’S JNCIS-SP and JNCIS-ENT EXAMS

July 6, 2018 Chris 6

Here’s the first of our three-part beginners guide to IS-IS. We’ll compare it to OSPF; we’ll talk about Level 1 and Level 2; we’ll explain the bizarre addressing system; we’ll look at a basic config, and we’ll talk about why Googling for IS-IS is very different from Googling for ISIS.

JUNOS: AGGREGATE ROUTES VS GENERATE ROUTES – HOW TO SUMMARISE ON JUNIPER ROUTERS
juniper junos routing subnetting 

JUNOS: AGGREGATE ROUTES VS GENERATE ROUTES – HOW TO SUMMARISE ON JUNIPER ROUTERS

March 25, 2018 Chris 13

In the 90s, the big fashion was Tamagotchis. In 2017 it was fidget spinners. And of course, in 2018 there’s only one trend on everyone’s lips: route summarisation. In Junos there’s three ways to summarise routes. Want to know what they are? Well gosh damn, you’ve come to the right place!

JUNOS: CHASSIS CLUSTERS – A BEGINNERS GUIDE TO JUNIPER SRX HIGH AVAILABILITY
high availability juniper junos routing 

JUNOS: CHASSIS CLUSTERS – A BEGINNERS GUIDE TO JUNIPER SRX HIGH AVAILABILITY

March 3, 2018 Chris 17

Want to learn how to configure Chassis Cluster, which lets you configure high-availability failover on Juniper firewalls? Good luck with the official documentation – it weighs in at precisely 638 pages long. 638 pages! That’s the length of two good books! Or one badly edited one. Anyway, this article is my attempt at boiling those 638 pages down into something a bit more manageable. You can thank me by emailing me £700,000.

OSPFv3 – HOW TO READ IPv6’s OSPF DATABASE
ipv6 ospf ospfv3 routing 

OSPFv3 – HOW TO READ IPv6’s OSPF DATABASE

January 5, 2018 Chris 3

Once you’ve read my guide to the new link-state advertisement types in OSPFv3, give this post a read, where we take a deep-deep into the OSPFv3 database. Put your topology hat on: we’re going exploring.

OSPFv3: THE NEW LSA TYPES IN IPv6 OSPF
ipv6 ospf ospfv3 routing 

OSPFv3: THE NEW LSA TYPES IN IPv6 OSPF

January 5, 2018 Chris 0

When I first heard that OSPFv3 introduced even more link-state advertisement (LSA) types, I despaired. As if the original seven didn’t take us long enough to memorise! Then I actually learned what they do – and honestly, it’s hard to imagine why we ever did it any differently. Let’s learn about them together!

TROUBLESHOOTING: USING THE DEBUG CONDITION INTERFACE COMMAND
troubleshooting 

TROUBLESHOOTING: USING THE DEBUG CONDITION INTERFACE COMMAND

December 11, 2017 Chris 0

There’s two handy Cisco troubleshooting tips I’ve learnt during my time as a network engineer. The first is to just ignore a problem and go to the pub. The other tip is the debug condition command, which helps you to troubleshoot by limiting debug messages to certain interfaces, IP addresses, MAC addresses, and a whole lot more.

OSPF: STUB AREAS VS STUB NETWORKS: WHAT IS THE DIFFERENCE?
ospf routing 

OSPF: STUB AREAS VS STUB NETWORKS: WHAT IS THE DIFFERENCE?

December 6, 2017 Chris 0

Big-ups to the designers of OSPF for giving very similar names to two totally different things. In this post, we clarify the difference between stub areas and stub networks.

OSPF: WHAT IS A STUB NETWORK?
ospf routing 

OSPF: WHAT IS A STUB NETWORK?

December 6, 2017 Chris 0

When you’re first getting to grips with your router’s OSPF database, you might see mention of something called a “stub network”. And let me tell you: never before have I seen a phrase so clumsily defined. Let’s take a look, and find out what a stub network actually is.

OSPF: WHAT IS A STUB AREA?
junos ospf routing 

OSPF: WHAT IS A STUB AREA?

December 6, 2017 Chris 6

Stub areas are a very easy concept to understand, but it comes with a ton of specific jargon that can make it super-daunting. So, in this post I’ll take time to explain these concepts, and to define just enough jargon to make you feel like you’re part of the elite. We’ll take it slow, like new lovers, or someone cooking an expensive turkey.

Hi!

I’m Chris, a network engineer, Juniper Ambassador and JNCIE-SP #2981. I’ve contributed towards a few books for Juniper in my time, and I have a few vendor certifications too, from Juniper, Cisco, Palo Alto and F5. But don’t mistake it for me actually knowing anything: I just do exams because I like a good pub quiz.

This is a blog of random knowledge I’ve acquired while studying for those sweet sweet network engineering certifications. There’s a big focus on Juniper in this blog, but sometimes I do other vendors too.

As I learn cool new stuff, I try to write it up with plenty of jokes, and a generous dollop of silliness, so that you’ll have as much fun learning about networking as I do.

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