My New SR-MPLS Course, and Krzysztof’s SRv6 Blogs
My new four-day instructor-led SR-MPLS course is now live! In addition, my colleague Krzysztof Szarkowicz has written many free blog posts on SRv6. Click this post to find out all about it.
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Author: Chris
Add Timestamps To Your Junos CLI Output
Junos offers a helpful command that adds a timestamp to every command you type. It’s easy to enable and disable, and it’s a great help when you scroll back through your historical CLI output. In this post I’ll show you how to use it.
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IS-IS and Unnumbered Ethernet Interfaces in Junos
There’s a trick you can use to massively reduce the number of IPv4 addresses you need in your network. With a little tweaking and a little bit of love, you don’t need to use addresses at all on point-to-point Ethernet links. Let me show you how.
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Your “Multihop” BGP Session Probably Isn’t Multi-Hop
BGP study guides tell you that loopback-to-loopback EBGP session require a TTL of 2 or more. The trouble is, they rarely say why. This leads new students to come to some very incorrect assumptions about how the TTL field works in IP. In fact though, you can absolutely have a TTL of 1! In this post we clear up all the confusion – and we even look at how you can use a TTL of 255 to bring extra security to your network.
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A Beginners Guide to Junos Firewall Filters
Firewall filters in Junos let you do far more than just filter traffic. They’re really powerful! And, despite their length, you can create them very quickly and easily. Let me show you how!
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How to Increase the CLI Character Limit in Junos
Networking devices like Junos will cut off your CLI input if you type too much. But did you know there’s an easy fix? Let me show you.
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Route Distinguishers: The Secret To Load Balancing In Multihomed MPLS VPNs
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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Junos: IS-IS Study Notes, Part 5 – Troubleshooting (For JNCIS-SP and JNCIS-ENT Students)
It’s the fifth and final part of our lessons on IS-IS! You’re now ready to learn how to troubleshoot and verify everything you’ve done so far. You’re really close to the finish line, so don’t give up!
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You’re Probably Using The Term MPLS Wrong
Is this title clickbait? I don’t think so – because once upon a time, I did exactly the same thing, and it cost me a job! Well, don’t worry: I’m here to help you avoid making the same mistake. Click here to find out my wild story, and how you can bring some commendable precision to your conversations about networking.
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MPLS Segment Routing, Part 2: Junos Config!
It’s time to learn how to configure MPLS segment routing in Junos! In this second part of my ongoing series I show you how easy it is to use SR as a replacement for LDP. The config is easy, and you’ll be itching to do it by the time you read this post.
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