NSX-V 6.4.11 host connection to Controller(s) is down after the Controller(s) are upgraded or newly deployed

Products

• VMware NSX

Issue/Introduction

The objective of this article is to help identify and troubleshoot this control plane issue.

Symptoms:

• Newly deployed or upgraded Controllers running NSX-V 6.4.11
• ESXi host connection to one or more controllers is down
• Ping from an ESXi host to Controller running 6.4.11 to its IP/FQDN fails
• VMs on the host are not being allocated IP addresses from the Edge DHCP service

Environment

VMware NSX Data Center for vSphere 6.4.x

Cause

Missing default route configuration on the Controller(s) leads to this connection issue.

Resolution

This issue is resolved with in NSX-V version 6.4.12. 

See NSX-V 6.4.12 release notes: VMware NSX Data Center for vSphere 6.4.12 Release Notes Issue 2835975.

Workaround:
Option 1:

• Reboot the impacted Controller(s) and verify connectivity is restored from the ESXi host(s)

Option 2: 

• With root user access to the Controller(s), run 'systemctl restart systemd-networkd' and verify that connectivity is restored.

Additional Information

Impact/Risks:
Some hosts may be unable to for connections to Controllers over TCP 1234 impacting network functionality.  VM's which rely on DHCP provisioning from an Edge IP Pool will be unable to procure an IP address.