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routing

isis juniper junos mpls routing 

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

December 14, 2020January 11, 2021 Chris 1139 Views 0 Comments

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!

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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, 2020May 11, 2020 Chris 18131 Views 14 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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juniper junos multicast routing 

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

March 7, 2020October 25, 2020 Chris 2643 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 mpls routing vpn 

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

September 7, 2019 Chris 2893 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, 2019December 16, 2019 Chris 3976 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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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 2861 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, 2019October 23, 2020 Chris 2866 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 6444 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 28, 2019 Chris 7117 Views 4 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, 2019November 23, 2020 Chris 10001 Views 19 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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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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