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Hyper-V host 1Gbps NIC negotiated at 100 Mbps when used for Virtual Switch

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  • Hyper-V host 1Gbps NIC negotiated at 100 Mbps when used for Virtual Switch

    Hi all,


    Hoping someone can shed some light on this one as Iíve been trying to hunt down a solution for a week now.



    Setup
    • HP ProLiant ML350 G6 with HP NC326i PCIe Dual Port Gigabit Server Adapter network adapters
    • Windows Server 2008 R2 Core with only the Hyper-V role installed
    • SBS 2011 installed as guest
    • Port 1 on Dual port NIC configured a physical port or management of Host only
    • Port 2 on Dual port NIC configured for use as an External Virtual Switch port for use by guests only
    The issue is that the physical port connected to the Hyper-V virtual Switch negotiates with the network switch at 100 Mbps full duplex while the management port negotiates at 1 Gbps full duplex. All clients (brand new HP Z210 workstations) also negotiate with the switch at 1 Gbps.

    During file copies and backups the network port connected to the Virtual Switch does not show any errors and transfers data at close to 100 Mbps. File transfers between individual workstations and workstations and server core again show no errors, but transfers at 1 Gbps.

    One observation is that the physical NIC connected to the Virtual Switch does not negotiate with the switch until the Hyper-V service has started (Iím guessing) the virtual switch.

    Also, while staging the server the Hyper-V virtual switch created when the server was connected to a 100 Mbps switch not a 1Gbps switch as it is in production.

    Has anyone encountered anything similar and if so how did you get the physical NIC to operate at full capabilities? Any assistance would be greatly appreciated.

    Thanks in advance.

  • #2
    Re: Hyper-V host 1Gbps NIC negotiated at 100 Mbps when used for Virtual Switch

    Hyper-V's Virtual Switch is capable of 10gbps speed and usually, the speed of the physical network and NIC determines the speed externally.

    Have you tried deleting the External Virtual Network and re-creating it? You of course will need to watch out for downtime.

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    • #3
      Re: Hyper-V host 1Gbps NIC negotiated at 100 Mbps when used for Virtual Switch

      The issue was in fact a cable.
      But in a stange sort of way. Either of the cables would not connect correctly in one of the NIC ports. I swapped to brand new cables and the issue was resolved.

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      • #4
        Re: Hyper-V host 1Gbps NIC negotiated at 100 Mbps when used for Virtual Switch

        I see, thanks for the feedback.

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