Host to Host TEP tunnels are down on the NSX UI after changing the Transport zone configuration for the TNP clusters.

Products

• VMware NSX

Issue/Introduction

• After changing the existing TNZ to new TNZ for couple of Esxi host cluster, the remaining host cluster which has old TNZ are reporting in " Degraded" state and tunnels are down.
• Configuration changes were made on the TNP profile by updating the Transport Zone from old to new on certain Host clusters.
• Tried "Detach" TNP for one particular cluster from NSX UI and "Attach" it back, but that did not help in resolving the tunnel down issue.

Environment

VMware NSX
vCenter - 8.0.x

Cause

• It's identified the ESXi hosts part of old Transport Zone are still forming TEP tunnel with other host cluster which is part of new Transport Zone.
• If the Transport Nodes (TNs) were removed from a Transport Zone (TZ) where Service Insertion (SI) Service Plane Logical Switches (SP LS) were still attached.

Resolution

•  Determined that the issue originated because an SPF port was connected to the SP LS.
•  Perform the workaround by unsetting the SPF port property (by placing the host in maintenance mode), so the Service Insertion (SI) would be non-functional. 

Additional Information

If the issue still exists after performing the workaround steps, please open a Broadcom Technical Support case. For more information, see How to Submit a Support Request