TX Packet drops reported from Aria Operations for Multiple VMs.

Products

• VMware vSphere ESXi

Issue/Introduction

• Aria operations reports packet drops for VMs on NSX segment. 
• VMs added to the DFW exclusion list are still reporting TX, in some cases RX, packet drops. 
• NSX distributed switch has two uplinks and two VTEPs. VTEP vmk10 and vmk11 exist in the same subnet, and utilize different uplinks. 
• Physical switch has RPF set to 'strict'. 
  
  
  
  

Environment

VMware NSX 

Cause

This situation occurs, when expected asymmetric routing occurs in an ESXi host, where this is conflicting with a physical switch mechanism. Specifically, where Reverse Path Forwarding (RPF), is set to 'strict'. 

Resolution

Change RPF mechanism on the physical switch from 'strict' to 'default'.