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Bypassing the ESX Tunnel Endpoint (TEP) 1600 MTU Check in the VCF Installer

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Before deploying a new VMware Cloud Foundation (VCF) 9.0 environment, the VCF Installer performs a number of validations including network MTU. The minimum MTU that is required to deploy VCF is 1600, which is used for the Tunnel Endpoint (TEP) for NSX traffic between your ESX hosts.

For most environments, this is not an issue and users will typically deploy VCF with Jumbo Frames enabled and configure the MTU with value of 9000. If your environment does not meet the minimum MTU requirement, the VCF Installer will flag this as an error and prevent you from deploying as shown in the screenshot below.


If you can not meet the MTU requirement, you can bypass the validation check so that you can continue with your deployment of the VCF Management Domain.

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Quick Tip - NSX Edge fails DNS pre-check as part of VCF 9.0.2 Upgrade

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As I continue my VMware Cloud Foundation (VCF) 9.0.2 upgrade journey, I have now reached the core SDDC components, including vCenter, NSX, and ESX.


NSX Manager and NSX Edges was up first and before the upgrade begins, a pre-check is performed. I was not expecting any issues but to my surprise, I ran into the following validation error:

DNS is not configured on edge 83ea6662-41b2-48aa-a8d0-22039d3230c0. Edge will not be able to resolve the fqdn to download the upgrade bundle from NSX manager. Kindly configure a valid DNS on edge.. Other components that failed with the same error: edge01b, edge01a


We all know how important DNS is and ensuring it is configured correctly, both forward and reverse lookups.

However, I like to think that I am pretty good about ensuring everything in my lab is setup with DNS and this honestly was a surprising error, that BOTH NSX Edges do NOT have DNS configured!?! 🤔

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Quick Tip - No space left on device when upgrading VCF Operations using VCF Operations Fleet Manager to VCF 9.0.2

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Yesterday, I began upgrading my VMware Cloud Foundation (VCF) environment from version 9.0.1 to the latest 9.0.2 release. After successfully upgrading VCF Operations Fleet Manager, I then proceeded to upgrade VCF Operations, which includes running a pre-validation to ensure everything was okay before we can proceed.


As you can see from the screenshot above, I ran into the following error: "No space left on device" which was pretty vague, but I figured it had to do with my VCF Operations instance, since I was attempting to upgrade it ...

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