ESX 5:  New build NIC speed 100 Full, instead of 1000 Full

Posted on 2012-08-13
Last Modified: 2012-08-13
Hi All,

I recently setup a new ESX 5 server (first one), everything going going ok, however I noticed the actual speed, duplex is showing as 100Mb, Full Duplex.  But the NIC on the server is Gb and the switch is also Gb.

Any idea why it's not showing as Gb?
Question by:detox1978
    LVL 116

    Accepted Solution


    1. physical switch is set to Autonegotiate at 1Gb
    2. check network cable
    3. You can also try and force 1Gb from vSphere Client.

    But I would check cable and physical switch support 1Gb first.
    LVL 2

    Author Comment

    We do have another ESX 4 server, that is forced to 1Gb. so I will try using the same switch and forcing it (if needed).

    I did try to forcing it to 1Gb but it just took the NIC offline.
    LVL 2

    Author Comment

    What should I check on the NIC cable?
    LVL 2

    Author Comment

    Switch was set to 100Mb
    LVL 2

    Author Comment

    I've plugged the two NIC into two 1Gb switches so they now negotiate 1Gb, but they say standby next to them.

    Any ideas?

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