6.5.1

Table Of Contents
Enable Jumbo Frames for a VMkernel Adapter
Jumbo frames reduce the CPU load caused by transferring data. Enable jumbo frames on a VMkernel
adapter by changing the maximum transmission units (MTU) of the adapter.
Procedure
1 In the vSphere Web Client, navigate to the host.
2 On the Configure tab, expand Networking and select VMkernel adapters.
3 Select a VMkernel adapter from the adapter table.
The properties of the adapter appear.
4 Click the name of the VMkernel adapter.
5 Click Edit.
6 Select NIC settings and set the MTU property to a value greater than 1500.
You can increase the MTU size up to 9000 bytes.
7 Click OK.
Enable Jumbo Frame Support on a Virtual Machine
Enabling jumbo frame support on a virtual machine requires an enhanced VMXNET adapter for that
virtual machine.
Procedure
1 Locate the virtual machine in the vSphere Web Client.
a Select a data center, folder, cluster, resource pool, or host and click the VMs tab.
b Click Virtual Machines and double-click the virtual machine from the list.
2 On the Configure tab of the virtual machine, expand Settings and select VM Hardware.
3 Click Edit and select the Virtual Hardware tab in the dialog box displaying the settings.
4 Expand the Network adapter section. Record the network settings and MAC address that the
network adapter is using.
5 Click Remove to remove the network adapter from the virtual machine.
6 From the New device drop-down menu, select Network and click Add.
7 From the Adapter Type drop-down menu, select VMXNET 2 (Enhanced) or VMXNET 3.
8 Set the network settings to the ones recorded for the old network adapter.
9 Set the MAC Address to Manual, and type the MAC address that the old network adapter was using.
10 Click OK.
vSphere Networking
VMware, Inc. 169