NSX Tier-0/Tier-1 Gateway reporting a 'down' state without any error or warning.

Products

• VMware NSX

Issue/Introduction

• Issue reported when the VLAN backed segment configured as service/external interface on Tier-0/Tier1 gateway.
• Tier-o Gateway reports "Down" status.
  • Tier-0 down status reports transport node status as "success" and Errors as "No Errors"

 

• HA mode on Tier-0 gateway reports HA status as "Down".

• HA status from edge CLI on Tier-0 SR reports "Down" status.

 

Environment

VMware NSX

Cause

The Edge High Availability (HA) channel relies on both the management and overlay/TEP networks. If an Edge node lacks an overlay transport zone configuration, Edge HA will start reporting down. This failure subsequently brings down the Tier-0 Gateway silently, without generating any error logs.

Edge High Availability (HA) Requirements:

• A TEP network is required for the HA Channel.
• The HA Channel uses the overlay/TEP and management networks of the Edge.
• A TEP network is required even when the Edge is used only for VLAN.

Resolution

Configure the edge node with overlay transport zone to fix the issue.

• Steps to add overlay transport zone:
  • Login to NSX UI. Go to --> System--> Fabric --> Nodes--> Select and edit the edge node used in Tier-0 gateway --> Go to "nsxHostSwitch" section --> Add overlay transport Zone --> Click on Save.
    • If there is no overlay transport zone created, Create overlay transport zone by referencing following tech doc: create-transport-zones
  • Go to the Tier-0 gateway, Refresh the page. Tier-0 status turns into "Success".

Additional Information

• Troubleshooting NSX Edge High Availability
• Edge HA Member Status down Alarm.

 

If additional assistance is needed with troubleshooting, we recommend reaching out to Broadcom support by creating a support case using the instructions at Creating and managing Broadcom support cases.