Network Bandwidth limit for VMs on the same ESXi host connected to same Virtual Standard Switch

Products

• VMware vSphere ESXi

Issue/Introduction

• Network performances between VMs degraded after upgrade to ESXi 7.0.3
• When performing iperf test on the virtual machines residing on the same esxi host same virtual standard switch getting 100Mb/s speed.
• If client and server are on the same host and same port group on virtual standard switch we get 100Mb/s speed.

Environment

vSphere ESXi 7.0.3

Cause

Traffic shaping is enable on the virtual switch level and is then inherited to the port group level. The values Average Bandwidth and Peak Bandwidth are set to 100000 kbp/s (i.e 100Mbps), Burst size limited to 102400 KB, causing the outbound traffic for the vm connected to limit to 100Mb/s.

Resolution

Disable traffic shaping on the virtual switch level or port group level.

Steps to disable traffic shaping:

• In the  vSphere Web Client, navigate to the host.
• On the Configure tab, expand Networking  and select Virtual switches..
• Navigate to the traffic shaping policy on the standard switch or port group.
   
   

  Option	Action
  vSphere Standard Switch	Select a standard switch from the list. Click Edit settings. Select Traffic shaping Form the dropdown select Disabled
  Standard port group	Select the standard switch where the port group resides. In the topology diagram, select a standard port group. Click Edit settings. Select Traffic shaping and select Override  next to the options to override. From the dropdown select Disabled

  
  
  

Additional Information

Configure Traffic Shaping for a vSphere Standard Switch or Standard Port Group