Since upgrading to NSX 6.4, I get warnings for certain ESXi hosts because there is a VLAN and MTU mismatch. So I checked the vDS healthchecks and found the following error: VLAN 0 is not supported. But since we didn’t remove or add VLANs on the physical switches, I was very surprised. And VLAN 0 shouldn’t exist anyway. So, what is it about and why does the error suddenly occur?
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