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Wednesday, 10 April 2013

Enabling Jumbo Frame For A Virtual Machine

Jumbo Frame 

Jumbo frames are large IP frames used in high-performance networks to increase performance over long distances. Jumbo frames is the term used most often to mean 9000 bytes for Gigabit Ethernet but can refer to anything over the IP MTU (Maximum Transmission Unit) which is 1500 bytes on an Ethernet.




Enabling jumbo frame support on a virtual machine requires an enhanced vmxnet adapter for that virtual machine.


1
Log in to the vSphere Client and select the virtual machine from the inventory panel.
2
Click the Summary tab, and click Edit Settings.
3
Select the network adapter from the Hardware list.
4
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
Click Add.
7
Select Ethernet Adapter and click Next.
8
In the Adapter Type group, select Enhanced vmxnet.
9
Select the network that the old network adapter was using and click Next.
10
Click Finish.
11
Select the new network adapter from the Hardware list.
12
Under MAC Address, select Manual, and enter the MAC address that the old network adapter was using.
13
Click OK.
14
Check that the Enhanced vmxnet adapter is connected to a standard switch or distributed switch with jumbo frames enabled.
15
Inside the guest operating system, configure the network adapter to allow jumbo frames.
See your guest operating system’s documentation for details.
16
Configure all physical switches and any physical or virtual machines to which this virtual machine connects to support jumbo frame