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# Use Existing (DMVPN) Device Configurations in netlab « ipSpace.net blog

**[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 2 min read · 0 upvotes · 0 comments

## Summary

Anne Baretta shares a workflow for using netlab to bootstrap a DMVPN lab topology that netlab doesn't natively support. The approach uses netlab to bring up the topology and apply initial configuration, then merges existing device configuration files using the `netlab config` command or per-node `config` parameters. A Bash loop automates pushing collected configs to each device. The post also covers gotchas like missing config files on first run (solved with `netlab up --no-config` and `netlab initial -i -m`) and the need to clean up collected configs after topology changes. A cleaner alternative is using netlab's node-name-based template discovery introduced in release 1.5.2.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://blog.ipspace.net/2023/04/netlab-merge-config>

## Questions this post answers

### How do I apply existing device configuration files to nodes in netlab when the feature isn't natively supported?

Use the `netlab config <file> -l <node>` command to push a full configuration file to a specific node, or set a per-node `config` parameter in the topology file pointing to the config file path. A Bash loop can automate this across all nodes. Node-name-based template discovery, introduced in netlab release 1.5.2, provides a cleaner alternative.

_Network engineers pushing unsupported configs into netlab labs track patterns like this on daily.dev._

### How do I start a netlab lab without applying custom configuration templates on first run?

Run `netlab up --no-config` to start the lab without any configuration, then follow with `netlab initial -i -m` to apply initial configuration and module settings while skipping custom configuration templates. This avoids crashes caused by missing config files that don't exist yet on the first lab bring-up.

_Engineers iterating on netlab topologies find workarounds like this faster on daily.dev._

## Similar posts on daily.dev

- [Configuring Management IP Addresses to Virtual Network Devices « ipSpace.net blog](https://daily.dev/posts/configuring-management-ip-addresses-to-virtual-network-devices-ipspace-net-blog-ffffzfuyz) · ipSpace.net Blog · 0 upvotes · 0 comments
- [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)

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