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

June 7, 2022 Chris 5986 Views 0 Comments

There’s three types of route distinguisher – and one of them unlocks some seriously useful advantages. If you don’t know how to use route distinguishers for load balancing inside an MPLS VPN, then this post is for you. Junos config, but vendor-neutral theory. Give it a read!

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WHY IS 65535 NOT PART OF THE PRIVATE AUTONOMOUS SYSTEM RANGE?

September 28, 2021June 8, 2022 Chris 10871 Views 1 Comment

A lot of websites tell you that the private AS range is 64512 to 65535. However, this isn’t quite correct – and the reason is really interesting. Click here to go on a BGP journey with me!

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bgp juniper junos mpls routing vpn 

L2VPN: THE LABEL BASE AND OFFSET, EXPLAINED!

February 13, 2021June 8, 2022 Chris 8000 Views 4 Comments

Pseudowires are easy on the surface – but dig a bit deeper, and there’s some interesting complexity. Click here to learn the details about BGP-signalled L2VPNs!

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

August 22, 2020June 8, 2022 Chris 4797 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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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 38322 Views 16 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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HUB-AND-SPOKE MPLS L3VPNs WITH ONE INTERFACE, ON JUNIPER JUNOS ROUTERS

August 30, 2019June 8, 2022 Chris 5890 Views 0 Comments

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!

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

August 24, 2019June 8, 2022 Chris 6571 Views 0 Comments

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!

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

August 18, 2019June 8, 2022 Chris 8990 Views 2 Comments

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!

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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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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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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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