IS-IS in Service Provider Networks: Design and Operations Guide

IS-IS in Service Provider Networks is still one of the most reliable choices for carrying loopbacks, infrastructure links, MPLS reachability, and Segment Routing information across large backbones. It is quiet, scalable, and protocol-flexible, but it also has a few operational details that can surprise engineers who mostly learned OSPF first.

This guide focuses on practical IS-IS design and operations for provider-style networks: levels, addressing, metrics, authentication, Segment Routing, and the troubleshooting checks that quickly separate a simple adjacency issue from a real control-plane problem.

X Follow @ipexptobe

MPLS to Segment Routing Migration: Practical Notes for Network Engineers

 Lately I've been spending a lot of time on projects related to migrating traditional MPLS (based on LDP) to a new solution based on MPLS Segment Routing. Migrations can be challenging and very interesting, so I’ll try to illustrate, using the example of several clients – of course, the data will be anonymized – what the migration process looks like and what its main advantages are. I'm returning to running this blog because it gives me the motivation for further activities and learning. I hope there will be readers for what I share here and that it will be useful to someone.

X Follow @ipexptobe