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  • Route Distinguishers: The Secret To Load Balancing In Multihomed MPLS VPNs
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  • MPLS Segment Routing, Part 2: Junos Config!
  • MPLS Segment Routing, Part 1: The Theory (Beginner’s Guide)
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routing

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, 2019June 8, 2022 Chris 5732 Views 2 Comments

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!

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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, 2019June 8, 2022 Chris 4876 Views 0 Comments

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)

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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, 2019June 8, 2022 Chris 9894 Views 2 Comments

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.

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ipv6 routing troubleshooting 

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

June 27, 2019June 8, 2022 Chris 13078 Views 5 Comments

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!

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bgp juniper junos mpls routing 

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

May 29, 2019June 8, 2022 Chris 21373 Views 20 Comments

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!

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bgp juniper junos mpls routing vpn 

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

May 19, 2019June 8, 2022 Chris 8163 Views 4 Comments

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!

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bgp jncis juniper junos routing troubleshooting 

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

January 4, 2019June 8, 2022 Chris 7430 Views 2 Comments

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!

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bgp jncis juniper junos mpls routing troubleshooting 

JUNOS ROUTING POLICY, BGP COMMUNITIES, AND MPLS VPNs

January 4, 2019June 8, 2022 Chris 19017 Views 0 Comments

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!

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cloud contrail jncia juniper routing sdn 

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

November 26, 2018June 8, 2022 Chris 21482 Views 24 Comments

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

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bgp jncis juniper junos mpls routing 

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

October 8, 2018June 8, 2022 Chris 12851 Views 4 Comments

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.

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Hi there!

Welcome to my blog of networking and nonsense.

I’m Chris, a London-based network engineer, Juniper Ambassador, Juniper-Certified Instructor, and JNCIE-SP.

In the daytime I’m a network architect, teacher and author. But in my spare time I come here to write some sweet sweet blog posts to help you with your networking studies. I hope you like them!

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.

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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