The deploy workload domain wizard proposes an incorrect vCenter Default Gateway, and it is not possible to change it

Products

• VMware SDDC Manager

Issue/Introduction

When completing the SDDC Manager > VI Configuration UI, on the step 3 Compute page - the user is able to manually enter the vCenter FQDN for the vCenter they want to create for the VI workload domain.

The vCenter FQDN is then resolved to the vCenter IP Address by DNS and auto-populated into the UI (the vCenter IP Address cannot be manually entered).

The vCenter Subnet Mask and vCenter Default Gateway are auto-populated into the UI (they are the values used in the management domain, they cannot be manually entered).

 

An error is seen under the vCenter Subnet Mask field - 

Subnet Mask should be able to identify network address of IP

An error is seen under the vCenter Default Gateway field -

Default Gateway and IP address must be on the same subnet

 

The user is unable to progress beyond this step 3 Compute page.

Environment

VCF 5.x

Cause

This is expected behaviour, something is attempting to be done that should not be done.

The VI workload domain vCenter server must be deployed in the same subnet as the management domain vCenter.

Resolution

Per the documentation below - vCenter Server and the NSX Manager cluster for the VI workload domain are deployed on the management domain.

https://techdocs.broadcom.com/us/en/vmware-cis/vcf/vcf-5-2-and-earlier/5-2/getting-started-with-vcf-5-2/deployment-flow-of-vmware-cloud-foundation.html

Thus, the vCenter Server for the VI workload domain must have an IP in the management domain subnet range, so that the corresponding management domain subnet mask and default gateway can be used.