SDDC Manager Add Operation Fails Due to NSX Transport Node Tunnel Status Down

Products

• VMware NSX

Issue/Introduction

During a VMware Cloud Foundation (VCF) add operation following an import, the operation fails. Host connectivity failures occur within the NSX overlay cluster. In the NSX Manager UI, the affected hosts experience communication issues. When navigating to System > Nodes > Host Transport Nodes, the Tunnel status column displays as "Down" or "Degraded".

Cause

The SDDC Manager add operation fails because it cannot establish proper communication with the transport nodes following a previous import operation, leading to disconnected NSX tunnels.

Resolution

1. Log in to the vSphere Client.
2. Place the host into maintenance mode.
3. Move the affected hosts out of the NSX-prepared cluster to unprepare them for NSX.
4. Verify the un-prepare operation completes successfully for the affected transport nodes.
5. Move the hosts back into the cluster to re-prepare them for NSX.
6. Remove the host out of maintenance mode.
7. Log in to the NSX Manager UI and navigate to System > Nodes > Host Transport Nodes.
8. Verify that the Tunnel status for the hosts now displays as "Up" or green.
9. Resume or retry the VCF add operation in SDDC Manager.

Additional Information

Deploying VCF Operation components from the SDDC API fails in step: Add vCenter Server and Data Center to VCF Operations fleet management
VTEP HA activated alarm
TEP tunnels are down between ESXi Transport Node and Edge Transport Node. (Alarm: Event type: Faulty TEP)
ESXi host is reporting "Faulty TEP" alert on the NSX UI