Mastering IS-IS
IS-IS, a robust link-state routing protocol, is key for scalable networks. This series demystifies IS-IS from its Layer 2 operations, NSAP addressing, and hierarchical design to advanced traffic engineering with practical Juniper configurations. Master IS-IS for high-performance network designs.
Mastering IS-IS – Part 1: Deconstructing the Foundations of a Robust Link-State Routing Protocol
Deconstruct IS-IS foundations: origins, Layer 2 operation, NSAP addressing, and hierarchy. Explore TLVs and practical Juniper configurations. A technical deep dive into why IS-IS is crucial for scalable, robust networks, setting the stage for mastering this powerful routing protocol.
Mastering IS-IS – Part 2: Building Topologies and Forming Adjacencies
Dive into Part 2 of our Mastering IS-IS series to explore how adjacencies form, the role of the DIS on broadcast links, and the state transitions that govern IS-IS neighbor relationships. Includes Juniper examples, troubleshooting tips, and visuals.
Mastering IS-IS – Part 3: Synchronizing State – The LSDB, LSPs, and SPF Calculation
In this part, we explore the Link-State Database (LSDB) and how LSPs are exchanged to build a synchronized network map. We'll also dissect the SPF algorithm, and demystify crucial concepts like timers, Administrative Distance, route filtering, and summarization to maintain a scalable network.
Mastering IS-IS – Part 4: Convergence and Resiliency – Optimizing for Speed and Stability
Optimize your network for speed and stability with this deep dive into IS-IS convergence. We explore fast timers, BFD, and SPF throttling to achieve sub-second convergence. Learn how Graceful Restart and the Overload Bit ensure resiliency during critical events.