Jumbo Frames

[sultanahmed]

Hi all,

I was just wondering if the following would work for setting up jumbo frames.

I have 2 VMs on the same host, both are using vxnet 2 enhanced network adaptors and VMCI is enabled (so they both comunicate with each other).

If I set the MTU within each OS on the VM to use an MTU value of 9000, will this work? Or will I have to create a new vswitch set the MTU to 9000 and ensure the physical switch port is set to a MTU value of 9000.

I don't believe I will have to create a switch or set the physical switch value, but I maybe wrong.

Just so I don't forget, this is a app server that user connect to and run reports etc.

[AndreTheGiant]

Jumbo Frame must be supported end to end and on each switch that they travel.

So be sure that vSwitch has a MTU=9000 (you can change from command line without delete it) and if the VM is on different hosts that also physical switch is well configured.

Andre

[sultanahmed]

ok, but if the VMs are on the same host and using VMCI by setting the MTU on the OS (under device manager) I should be fine as this will keep the comms at the hypervisor level rather than going out onto the phyiscal network. My only concern is that users connect via a web browser to the app residing on the server and thus coms will go out onto the physical network.

[AndreTheGiant]

If VMs are on the same portgroup on the same ESX than you only need that vSwitch has MTU=9000 and both vNIC are setted for jumbo frames.

Andre