New T1 Router marked Down in NSX UI

Products

• VMware NSX

Issue/Introduction

A newly created T1 gateway is marked as down, with no additional configuration completed beyond the gateway creation and association with an Edge cluster.

Environment

Greenfield NSX-T 3.x and 4.x deployments are affected.

Cause

The issue occurs because no overlay transport zone is configured and attached to the NSX Edge Node within the NSX Edge Cluster where the T1 gateway is deployed.

Resolution

To resolve this, attach an overlay transport zone to the NSX Edge Cluster. T1 routers rely on an overlay network for communication and will be marked as down if one is unavailable.

For more information on best practices for configuring and managing NSX environments, please refer to the NSX Installation Guide and NSX Administration Guide.