It’s the network team’s fault…

The Scenario

Imagine you have an environment that has hundreds of VLANs. When you build a new cluster, there’s a real possibility that one host out of many is mis-configured on just a single port group or VLAN. It’s a pretty simple issue, but it’s like finding a needle in a haystack. Because of that, it’s incredibly difficult to troubleshoot, so I wrote a script to run through every ESXi host, and test connectivity on each port group.