--- title: netlab: Embed Configuration Templates in a Lab Topology... description: netlab release 25.09 introduces a `configlets` dictionary in the lab topology file, allowing users to embed custom configuration templates directly without... canonical: https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: netlab: Embed Configuration Templates in a Lab Topology File « ipSpace.net blog | daily.dev og:description: netlab release 25.09 introduces a `configlets` dictionary in the lab topology file, allowing users to embed custom configuration templates directly without... og:url: https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9 og:image: https://api.daily.dev/og/posts/ZF49TsRX9.png og:image:alt: netlab: Embed Configuration Templates in a Lab Topology File « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # netlab: Embed Configuration Templates in a Lab Topology File « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 3 min read · 0 upvotes · 0 comments ## Summary netlab release 25.09 introduces a `configlets` dictionary in the lab topology file, allowing users to embed custom configuration templates directly without separate files. The `files` plugin generates `.j2` template files (e.g., `ifup.j2`, `ifdown.j2`) when running `netlab up` or `netlab create`. Multi-vendor templates are supported by using a nested dictionary keyed by platform (e.g., `eos`, `frr`), producing per-platform files in a subdirectory. A known limitation exists for sharing a base template across multiple platforms, with a fix planned for release 25.11. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I embed custom configuration templates directly in a netlab topology file? In netlab release 25.09, you can add a `configlets` dictionary to the lab topology file. The `files` plugin reads this dictionary and generates `.j2` template files in the lab directory when you run `netlab up` or `netlab create`. For multi-vendor support, the value of each configlet entry can itself be a dictionary keyed by platform (e.g., `eos`, `frr`), producing per-platform files in a named subdirectory. _Network engineers building multi-vendor labs track netlab releases and patterns like these on daily.dev._ ### How do I create multi-vendor configuration templates in netlab for different platforms like Arista EOS and FRR? Set the configlet value to a nested dictionary keyed by platform name. For example, under `configlets.ifup`, adding `eos` and `frr` keys with their respective commands causes the files plugin to create `ifup/eos.j2` and `ifup/frr.j2` in the lab directory. A `base` entry for fallback to other platforms exists but has a known limitation in this scenario, with a fix coming in release 25.11. _Developers automating multi-vendor network labs find netlab release notes and workarounds like this on daily.dev._ ## Similar posts on daily.dev - [Compress netlab Lab Topologies with Dot Notation « ipSpace.net blog](https://daily.dev/posts/compress-netlab-lab-topologies-with-dot-notation-ipspace-net-blog-johomwxka) · ipSpace.net Blog · 0 upvotes · 0 comments --- Tags: [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"netlab: Embed Configuration Templates in a Lab Topology File « ipSpace.net blog","url":"https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9"},"datePublished":"2026-08-11T08:56:00.693Z","dateModified":"2026-08-24T07:03:21.879Z","description":"netlab release 25.09 introduces a `configlets` dictionary in the lab topology file, allowing users to embed custom configuration templates directly without...","image":"https://media.daily.dev/image/upload/s--P4t4XyoV--/f_auto/v1722860399/public/Placeholder%2001","thumbnailUrl":"https://media.daily.dev/image/upload/s--P4t4XyoV--/f_auto/v1722860399/public/Placeholder%2001","isAccessibleForFree":true,"articleSection":"ipSpace.net Blog","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ipSpace.net Blog","logo":"https://media.daily.dev/image/upload/s--xS7E82MT--/f_auto,q_auto/v1786438303/logos/ipspace?_a=BAMAMicg0","url":"https://daily.dev/sources/ipspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"networking","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ipSpace.net Blog","item":"https://daily.dev/sources/ipspace"},{"@type":"ListItem","position":3,"name":"netlab: Embed Configuration Templates in a Lab Topology File « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/netlab-embed-configuration-templates-in-a-lab-topology-file-ipspace-net-blog-zf49tsrx9#faq","mainEntity":[{"@type":"Question","name":"How do I embed custom configuration templates directly in a netlab topology file?","acceptedAnswer":{"@type":"Answer","text":"In netlab release 25.09, you can add a `configlets` dictionary to the lab topology file. 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