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routing

juniper junos mpls routing vpn 

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

September 7, 2019 Chris 870 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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bgp jncis juniper junos routing 

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

August 18, 2019August 18, 2019 Chris 1479 Views 0 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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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, 2019July 10, 2019 Chris 1008 Views 0 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, 2019July 10, 2019 Chris 1006 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, 2019July 10, 2019 Chris 2754 Views 0 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 28, 2019 Chris 1772 Views 2 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, 2019May 29, 2019 Chris 3472 Views 3 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, 2019July 10, 2019 Chris 1789 Views 0 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, 2019January 25, 2019 Chris 2434 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, 2019January 4, 2019 Chris 6403 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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Hi!

I’m Chris, a network engineer, Juniper Ambassador, Juniper Author, and JNCIE-SP #2981. I have a few other certifications behind me too, but don’t mistake it for me actually knowing anything: I just 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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