Steps to migrate VM workloads from NSXT overlay to vlan segment

Products

• VMware NSX
• VMware Telco Cloud Infrastructure

Issue/Introduction

Due to network traffic performance issues, application vendor requested to migrate VM workloads from NSXT overlay segment to vlan-backed segments  

Environment

NSX-T 3.2.2

TCI 2.2

Resolution

To achieve this change, you will need to perform a "Create and Migrate" procedure. Follow below steps:

1. Create the VLAN Segment:
   • Navigate to Networking > Segments in NSX Manager.
   • Create a new segment, selecting a VLAN Transport Zone and providing the required VLAN ID.
   • Leave the "Connected Gateway" as None (VLAN segments typically route via your physical core router).
2. Migrate Workloads:
   • In vCenter or in VCD, locate your application VMs.
   • Edit the Network Adapter settings for each VM and browse to select the newly created VLAN-backed segment/port group.
   • Note: Since you are changing the network backing, ensure your guest OS IP/Gateway settings align with the physical VLAN configuration.
3. Post-Migration Cleanup:
   • Once all VMs have been migrated, verify the old Overlay segment shows 0 ports in use.
   • Delete the old Overlay segment to prevent configuration drift.