Junos: IS-IS Study Notes, Part 4 – Levels, Areas, The Attached Bit, and Default Routes

The fourth part in this intro to IS-IS series tackles areas, and how they’re different to levels. A lot of new students confuse them, and a lot of documentation gets it wrong too! This post clears everything up for you, and will make you super confident. You’ll also learn about IS-IS default routes, and route leaking from L2 to L1. Give it a click!

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CLEAN UP YOUR ROUTING TABLE! REMOVING POINT-TO-POINT SUBNETS FROM IS-IS, IN JUNOS

Some ISPs like to remove point-to-point prefixes from IS-IS. This keeps their routing tables small and easier to read. But how does it work? Doesn’t this break things? What are the trade-offs? This post shows you how to configure this solution, and the things you’ll want to consider if you deploy it. It’s super-cool, and you’ll definitely enjoy seeing the mechanics in action!

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MAXIMISE YOUR JUNOS NETWORK WITH MPLS, PART 3: CONTAINER LSPs

Container LSPs let us automatically create MPLS LSPs when we need them, and tear them down when we don’t. We can automate load-balancing, and keep the state in our network to a minimum. It’s really nice! Click here to read all about them, in the third and final part of this series on MPLS bandwidth, and automating our network to get the most out of it.

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