[VMC on AWS] Citrix Netscaler VPX loss of connection on i4i.metal and i3en.metal

Products

• VMware Cloud on AWS

Issue/Introduction

To explain the cause of the communication issue and provide a workaround.

Symptoms:
Citrix VPX load balancer VMs loses communication with other VMs at layer 7 when running on i4i.metal or i3en.metal with VMware Cloud on AWS.

Cause

This issue occurs on the Citrix Netscaler VPX load balancer because the Vmxnet3UseQueueLock is set to 1 on i4i.metal/i3en.metal.  

Resolution

See workaround.

Workaround:
Use e1000 network interface on any Citrix Netscaler VPX deployment on i4i.metal or i3en.metal.

Additional Information

Impact/Risks:

Load balancing operations are interrupted when converting from i3.metal to i4i.metal/i3en.metal. New Citrix Netscaler VPX deployments using Vmxnet3 will fail to operate when deployed on i4i.metal/i3en.metal.