Pre-requisites for Removing an NSX-T Tier 1 Connection in VMware Cloud Director

Products

• VMware Cloud Director

Issue/Introduction

• Attempts to remove the T1 connection may result in:

Bad Request: Error occurred in the backing network provider: Found errors in the request. Please refer to the related Errors for details. 

Environment

Cloud Director 10.3.3.4

Cause

• Before removing a T1 connection from VCD, there are a number of prerequisites that must be checked.

Resolution

Prerequisites for Removing an NSX-T Tier-1 Connection in VMware Cloud Director 10.3

Before removing an NSX-T Tier-1 (T1) connection from a tenant in VMware Cloud Director 10.3, ensure the following prerequisites are met:

1. Confirm Admin or Tenant Admin Permissions

• Verify you have the necessary admin or tenant admin rights in VCD and NSX-T to modify or remove network configurations.

2. Ensure No Active Workloads Are Using the T1 Gateway

• Confirm that no VMs or services are using the Tier-1 gateway.
• Check for active workloads connected to any networks associated with the T1 router.
• Ensure that no VMs are connected to any networks linked to the T1.

3. Verify No Dependent Edge Services

• Confirm there are no edge services (e.g., NAT, load balancing, or firewall rules) configured on the T1 router.
• Ensure services like DHCP or VPN associated with the T1 router are decommissioned.

4. Disconnect Tenant Networks

• Ensure all Org VDC networks connected to the T1 router have been disconnected or removed.
• Validate network disconnection through the Networking tab in the tenant's organization in VCD.

5. Remove Static and Dynamic Routes

• Confirm there are no static or dynamic routes configured on the T1 router.
• Disable any dynamic routing protocols (e.g., BGP, OSPF) associated with the T1 before proceeding.

6. Remove Distributed Firewall Rules

• Verify that distributed firewall (DFW) rules associated with the T1 router are removed or updated as needed.

7. Backup Configuration

• Take a snapshot of the NSX-T Manager and VCD appliances to ensure you can restore if needed.

8. Review Multi-Site Configurations

    If your deployment is part of a multi-site setup, confirm that the T1 gateway removal will not affect other sites.

9. Remove the T1 connection from VCD.

Additional Information

If you are still experiencing issues with removing a T1 connection after completing the steps, please open a case with Broadcom Support.