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  • 1.  Jumbo Frames

    Posted Nov 24, 2009 01:45 PM

    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.

  • 2.  RE: Jumbo Frames

    Posted Nov 24, 2009 01:49 PM

    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.


  • 3.  RE: Jumbo Frames

    Posted Nov 24, 2009 01:54 PM

    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.

  • 4.  RE: Jumbo Frames

    Posted Dec 06, 2009 10:07 AM

    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.