Distributed Switch LAG Configured with 4 vmnics - Rx Traffic Only Seen On 2 vmnics

Products

• VMware vSphere ESXi
• VMware vCenter Server

Issue/Introduction

When configuring a LAG in vSphere on a distributed switch, the default load balancing method is Source and Destination IP, Port, VLAN. 

The upstream physical switch will also be configured with a load balancing method, and the LAG in vSphere needs to be configured to use the same method. 

Environment

VMware vSphere ESXi

Cause

If the upstream physical switch is configured with a different load balancing algorithm than the LAG in vSphere, it is expected that traffic will not be distributed correctly across the uplinks at any given time. 

Resolution

Reconfigure the LAG in vSphere to use the same load balancing method as is configured on the upstream physical switch. 

Additional Information

Reference KB - "ESXi load balancing should match the physical switch load balancing algorithm"