# netlab: Embed Configuration Templates in a Lab Topology File

DevFeed: [netlab: Embed Configuration Templates in a Lab Topology File](<https://devfeed.tech/articles/netlab-embed-configuration-templates-in-a-lab-topology-file-11262.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/10/netlab-configlets/>)

Published: 2025-10-13T06:30:00Z

Content type: tutorial

Language: en

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

Topics: [configuration](<https://devfeed.tech/topics/configuration.md>), [Template](<https://devfeed.tech/topics/template.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>)

Tags: [blog-post](<https://devfeed.tech/tags/blog-post.md>), [cli](<https://devfeed.tech/tags/cli.md>), [commands](<https://devfeed.tech/tags/commands.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [files](<https://devfeed.tech/tags/files.md>), [implement](<https://devfeed.tech/tags/implement.md>), [netlab](<https://devfeed.tech/tags/netlab.md>)

## AI overview

This article explains how netlab release 25.09 lets users embed custom configuration templates, called configlets, directly in a lab topology file. It covers shared templates, vendor-specific templates, and a limitation affecting reuse across device types that is expected to be fixed in release 25.11.

## Source excerpt

A few days ago, I described how you can use the new config.inline functionality to apply additional configuration commands to individual devices in a netlab-powered lab. However, sometimes you have to apply the same set of commands to several devices. Although you could use device groups to do that, netlab release 25.09 offers a much better mechanism: you can embed custom configuration templates in the lab topology file. Read more ...