Learn Juniper and Cisco networking – with jokes!
In part 2 of this three-part post we 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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Ever wondered whether it’s possible to stretch an MPLS VPN across two ISPs? Well, indeed it is! In fact, there’s three ways to do it, and in this first post we learn all about the method officially known as “Option A”.
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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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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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