KB2913659 – WS2012 R2 Hyper-V Crashes When Network Traffic Passes Through A Virtual Switch

This KB article was released in January 2014 and is not related to the commonly reported issues with Intel and Emulex 10 GbE NICs. This hotfix is for when Windows Server 2012 R2-based Hyper-V server crashes when network traffic passes through a virtual switch.


Consider the following scenario:

  • You have the Hyper-V server role installed on a computer that is running Windows Server 2012 R2.
  • You create a switch team over a physical network adapter.
    Note The virtual machine queue (VMQ) is enabled on the network adapter.
  • You create a virtual switch over the switch team.
    Note There is no forward extension present.
  • Network traffic passes through the virtual switch.

In this scenario, the computer crashes, and data loss occurs.

A supported hotfix is available from Microsoft.

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