Host transport node status degraded due to tunnel failures

Products

• VMware NSX

Issue/Introduction

• In the NSX UI, host transport node/s are in degraded status.
• This is accompanied by multiple tunnel failures occurring between the Host Tunnel Endpoint (TEP) and the Edge TEP interfaces.
  
  

Environment

VMware NSX

Cause

• The issue is caused by an old or duplicate Edge VM that remained powered on with an active TEP configuration.
• This creates a conflict within the transport network (such as overlapping TEP or gateway usage), causing host transport nodes to form tunnels with the incorrect Edge node, which results in tunnel establishment failures with the active Edge nodes.

Resolution

To resolve the tunnel failures and restore the transport node status, you must remove the conflicting Edge VM:

1. Identify any  old or duplicate Edge VMs still powered on within the environment.

2. Verify if the TEP configuration on these old or duplicate VMs conflicts with your current environment's active TEP network or gateway IPs.

3. Power off the  old or duplicate Edge VM to eliminate the configuration conflict.

4. Validate that the host TEP connectivity to the active Edge nodes has been restored.

5. Confirm in the NSX UI that the tunnel status has recovered and the transport node has returned to a Healthy state.

Additional Information

Reference KB: Troubleshooting NSX TEP Tunnels between ESXi hosts and Edges