# Lab: Adjust IS-IS Timers

DevFeed: [Lab: Adjust IS-IS Timers](<https://devfeed.tech/articles/lab-adjust-is-is-timers-11279.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/11/isis-lab-timers/>)

Published: 2025-11-07T06:37:00Z

Content type: tutorial

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [IS-IS](<https://devfeed.tech/topics/is-is.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [GitHub](<https://devfeed.tech/topics/github.md>)

Tags: [github](<https://devfeed.tech/tags/github.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [is-is](<https://devfeed.tech/tags/is-is.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [network](<https://devfeed.tech/tags/network.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [routing](<https://devfeed.tech/tags/routing.md>), [speed](<https://devfeed.tech/tags/speed.md>)

## AI overview

A lab exercise demonstrates how adjusting IS-IS timers can affect network convergence speed and stability. It recommends using BFD for fast convergence and provides instructions for launching the lab with GitHub Codespaces or local infrastructure using netlab.

## Source excerpt

Like any other routing protocol, IS-IS has several timers you can tweak to improve the convergence speed of your network, or make your network unstable (eventually breaking it completely) if you reduce them too much (if you care about fast convergence, you REALLY SHOULD use BFD). You'll find more details (and the opportunity to tweak the timers in a safe environment) in the Adjust IS-IS Timers lab exercise. Click here to start the lab in your browser using GitHub Codespaces (or set up your own lab infrastructure). After starting the lab environment, change the directory to feature/6-timers and execute netlab up.