You can enable Jumbo Frames for iSCSI or iSER adapters that use VMkernel networking for their traffic. These adapters include software iSCSI adapters, dependent hardware iSCSI adapters, and VMware iSER adapters.

To enable Jumbo Frames, change the default value of the maximum transmission units (MTU) parameter. You change the MTU parameter on the vSphere switch that you use for iSCSI traffic. For more information, see the vSphere Networking documentation.


  1. Navigate to the host.
  2. Click the Configure tab.
  3. Under Networking, click Virtual switches, and select the vSphere switch that you want to modify from the list.
  4. Click the Edit settings icon.
  5. On the Properties page, change the MTU parameter.
    This step sets the MTU for all physical NICs on that standard switch. Set the MTU value to the largest MTU size among all NICs connected to the standard switch. ESXi supports the MTU size of up to 9000 Bytes.