# Using netlab to Argue with Vendor TAC

DevFeed: [Using netlab to Argue with Vendor TAC](<https://devfeed.tech/articles/using-netlab-to-argue-with-vendor-tac-11400.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2026/06/netlab-arguing-vendor-tac/>)

Published: 2026-06-04T05:42:00Z

Content type: article

Language: en

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

Topics: [Network](<https://devfeed.tech/topics/network.md>), [bug](<https://devfeed.tech/topics/bug.md>), [configuration](<https://devfeed.tech/topics/configuration.md>), [virtualization](<https://devfeed.tech/topics/virtualization.md>), [Ubuntu](<https://devfeed.tech/topics/ubuntu.md>)

Tags: [bug](<https://devfeed.tech/tags/bug.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [data-center](<https://devfeed.tech/tags/data-center.md>), [installation](<https://devfeed.tech/tags/installation.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [network](<https://devfeed.tech/tags/network.md>), [outage](<https://devfeed.tech/tags/outage.md>), [ubuntu](<https://devfeed.tech/tags/ubuntu.md>), [virtualization](<https://devfeed.tech/tags/virtualization.md>)

## AI overview

A netlab user recreated a data center network topology with virtual network devices after a configuration change caused an outage. The lab reproduced the issue on vendor devices, allowing the user to send the topology file to the vendor TAC team for independent reproduction. The article also notes an installation problem involving libvirt, Ubuntu 25.04, and nested virtualization that was subsequently fixed.

## Source excerpt

A happy netlab user sent me an unexpected use case: they successfully used its multi-vendor capabilities to argue with a vendor TAC. Here's the gist of the story (edited/anonymized for obvious reasons): They deployed a configuration change that resulted in an unexpected outage. The outage partially disrupted the data center network, so they didn't have the luxury of collecting data and reproducing the issue, as they had to roll back the change as expeditiously as possible. Read more ...