Error: "Edge gateway ### cannot be connected to more than 9 non-distributed networks" error when attempting to add a network

Products

• VMware Cloud Director

Issue/Introduction

• Unable to attach additional Organization VDC networks to an existing Edge Gateway.

Environment

VMware Cloud Director 10.x

Cause

This limit is a default setting inherited from legacy NSX-V architectures, whereas NSX-T Tier-1 Gateways are capable of supporting significantly higher interface counts. In NSX-T, the Tier-1 gateway downlink or service interfaces can reach up to 1000 interfaces per Tier-1 gateway. 

Resolution

Use the cell management tool command to increase the limit.

1. Open an SSH connection to any of the Cloud Director cells and login as root.
2. Verify the current limit using the command below:
   
   /opt/vmware/vcloud-director/bin/cell-management-tool manage-config -n networking.gatewayInterfaceCount -l 
   
   
3. Change the value to the desired value. Example for 20:
   
   /opt/vmware/vcloud-director/bin/cell-management-tool manage-config -n networking.gatewayInterfaceCount -v 20

The default for this configuration option is 10. It's recommend to increase the value to a number that meets your foreseeable growth (e.g., 20, 30) rather than the absolute maximum.