Learn Juniper and Cisco networking – with jokes!
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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In this first of a two-part post, I’m going to take you on a magical journey. And by “take you on a magical journey” I mean “teach you what the inet.3 table does on a Juniper router.” Which is basically the same thing as a magical journey, right?
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If you ever find a new BGP neighborship isn’t coming up, here’s a list of things to check. That is, unless you’re a coward?
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If you’re cool, hip, and “with it”, you’ll know there’s one thing millennials just can’t stop talking about: MPLS VPNs. But: how do you configure them? Well, it’s a good job you came to me – because in this article you’ll learn exactly how. We’ll configure it together, we’ll type some show commands to learn exactly what’s going on – and then we’ll look at how to troubleshoot it when it breaks.
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Sometimes when you’re looking at a router’s BGP routing table, you might see that a prefix is being advertised to an “update-group”. Now, you might think to yourself: wait a second, I didn’t configure any update-groups. Unless I did it when I was drunk? Well, I’m happy to tell you that this time you didn’t get up to any DBGP (Drunken Border Gateway Protocol): this happens automatically. Let’s find out what it means!
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Something that took me ages to grasp was the difference between BGP route-distinguishers and route-targets in MPLS VPNs. And even when I thought I understood, I still didn’t see why we needed both. Why not just have the one number to fit both tasks? Click this post, and find out all about it!
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